Bosses

**Bosses** are passive, resilient enemies that offer no challenge to players. Defeating a boss is usually instrumental in advancing the game in some way. Each has its own particular way of being summoned. For example, most bosses have associated summoning items that can be used to spawn them manually under certain conditions, while there are others that will appear after the player interacts in a certain way with the environment. Event bosses will only appear during their respective events and leave when the event ends. Mini-bosses also exist and spawn naturally in various biomes under various conditions, which pose a lesser yet still difficult challenge for unsuspecting players.

The Calamity Mod expands on the number of bosses that can be challenged throughout the game, each featuring unique AI [*>citation needed*] and drops. Most require the use of boss summoning items in order to spawn, but others have more unique prerequisites. The initial defeat of bosses (both vanilla and Calamity) typically results in some form of change within the world, be it new enemies appearing or a meteor crash, indicated by status messages to direct players towards the new content. Many also drop lore entries, usually explanations about what they are and why they exist. The mod currently adds twenty-eight new mini-boss encounters, fifty-five new boss encounters and eight new Superboss encounters.

The Calamity Mod's new difficulty modes, Revengeance Mode, Death Mode and Malice Mode (now disabled), increase the challenge even further, often to levels that require rigorous training and complete knowledge of the boss fights.

The Calamity mod reworks the attacks of most vanilla bosses, and most of these reworks can be seen when fighting them in Revengeance mode or harder. That being said, most bosses introduced by Calamity are designed to be much more difficult than those of vanilla Terraria, offering a challenge even to seasoned players, but are not required to progress through the vanilla game's content. To make up for this, they often drop more powerful equipment and open up new tiers of progression. During an active boss fight, the Boss Effects debuff will activate, which reduces enemy spawn rates.

After the player has killed the King Slime will find these bosses to be spectacularly difficult, but if proper preparations are made, all of them can be defeated at their respective level of progression. Players are advised to make use of arenas, potions and any other kind of aid they can muster before confronting these challenging bosses.

## Pre-Hardmode Bosses

### The Inventors

*For elaborate strategies on defeating The Inventors, including Weapon and Arena recommendations, see Guide:The Inventors strategies.*

**The Inventors** (Japanese: 発明者たち *Hatsumei-sha-tachi*) are a pair of armored individuals with 900 total health (**1,040** health in Expert Mode, and **1,128** health in Revengeance Mode). They are summoned anywhere and at any time by using the Wulfrum Signal Transmitter with a Draedon Power Cell, and do not spawn naturally. They are intended to be the first bosses fought and have a relatively simple AI, though they can easily overwhelm an unprepared player. John Wulfrum utilizes short-ranged melee attacks while Jane Wulfrum shoots at the player from a medium distance with different weapons.
The Inventors drop higher-tiered Wulfrum weapons , as well as Wulfrum Metal Scraps and Energy Cores. Defeating them will also allow Cnidrions to start dropping Desert Medallions.

### Wulfrum Excavator

*For elaborate strategies on defeating the Wulfrum Excavator, including Weapon and Arena recommendations, see Guide:Wulfrum Excavator strategies.*

The **Wulfrum Excavator** (Japanese: ウルフルム掘削機 *Urufurumu kussaku-ki*) is a sleek metal serpent with 2,000 health (**3,500** health in Expert Mode, and **5,000** health in Revengeance Mode). It is summoned by hitting a Wulfrum Amplifier with a pickaxe ( while an Ogscule is in the player's inventory), and does not spawn naturally. It is intended to be the first boss that the player fights, even before King Slime. The boss attacks by cycling through different movement patterns while firing lasers.
The Wulfrum Excavator drops Wulfrum Metal Scraps as well as several items crafted from them. Killing it will also allow Cnidrions to start dropping Desert Medallions.

### Desert Scourge

*For elaborate strategies on defeating the Desert Scourge, including Weapon and Arena recommendations, see Guide:Desert Scourge strategies.*

The **Desert Scourge** (Japanese: 砂漠の惨劇 *Sabaku no sangeki*) is a large, dry, spiked worm with 2,600 health (**4,160** health in Expert Mode, and **4,800** health in Revengeance Mode). It is summoned with a Desert Medallion in the Desert, and does not spawn naturally. While it is intended to be one of the first bosses fought and has a relatively simple AI, its intimidating size and speed can easily overwhelm an unprepared player. It becomes a greater threat in Revengeance Mode, where two smaller Desert Scourges join it in the fight, and it is able to fire a barrage of sand bolts from its segments.
The Desert Scourge drops weapons themed around water and electricity, as well as many Pearl Shards, an early game crafting material. It also drops many Angler quest rewards such as the Weather Radio or the Angler Earring. Additionally, it allows blocks in the Sunken Sea to be mined and enables Sandstorms.

### Monstro

*For elaborate strategies on defeating Monstro, including Weapon and Arena recommendations, see Guide:Monstro strategies.*

**Monstro** (Japanese: モンスター *Monsutā*) is a medium-sized, slime-like blob of flesh with 2,000 health (**2,100** health in Expert Mode, and **2,200** health in Revengeance Mode). It is intended to be defeated just before fighting Crabulon, but just after the Desert Scourge and the Eye of Cthulhu. It is summoned by inserting a Bloody Vein into an Anomaly-109, and can not spawn naturally. It starts off dazed, giving the player time to run, but when this grace period ends, it will begin to bound closer. Once Monstro reaches a distance of 10 blocks from the player, it will begin to attack. Monstro has attack behavior reminiscent of both the Eye of Cthulhu and King Slime, and will begin to slam on the player, shooting a semi-predictive blood-burst and ejecting several Demon Eyes above the player while doing so. It becomes even more powerful in Revengeance Mode, gaining a new, second phase where its attacks more frequent, the predictive aspect of its attacks becoming even more accurate.
Monstro drops one of four of its thematic weapons upon its defeat. Additionally, defeating Monstro for the first time in a world will allow the world to spawn either Copper Ore or Tin Ore.

### Crabulon

*For elaborate strategies on defeating Crabulon, including Weapon and Arena recommendations, see Guide:Crabulon strategies.*

**Crabulon** (Japanese: クラブロン *Kuraburon*) is a mushroom crab with 3,000 health (**4,800** in Expert Mode, and **6,400** in Revengeance Mode) fought in the Glowing Mushroom biome. It can be summoned by using a Decapodita Sprout while in the Glowing Mushroom biome. While it spawns initially passive, it begins to attack once damaged, jumping and lunging at the player. It fires bursts of mushroom projectiles and summons many Crab Shrooms and walls of mushrooms, which float down in the players direction, as it takes damage.
Crabulon drops mushroom-themed weapons and materials related to the Glowing Mushroom biome.

### Acidsighter

*For elaborate strategies on defeating the Acidsighter, including Weapon and Arena recommendations, see Guide:Acidsighter strategies.*

The Acidsighter drops sulphur-themed weapons related to the Sulphurous Sea. Additionally, it unlocks the Acid Rain event.

### The Hive Mind

*For elaborate strategies on defeating the Hive Mind, including Weapon and Arena recommendations, see Guide:The Hive Mind strategies.*

**The Hive Mind** (Japanese: 集合意識 *Shūgō ishiki*) is a large, brain-like amalgamation with 7,000 health (**11,200** in Expert Mode, and **14,976** in Revengeance Mode). It is summoned by using a Teratoma in The Corruption or by dropping a Shadow Scale onto a patch of Grimesand. For its first phase it is immobile, teleporting from time to time, instead relying on its many corrupt minions to attack the player. After losing 25% of its health, it transitions into its second phase, fully healed and no longer bound to the ground. It now rushes and teleports towards the player, performing special dash attacks while continuing to summon its servants.
The Hive Mind drops weapons themed around corruption and the dark, as well as Rotten Matter, which can be used to craft its drops and other items. After defeating it for the first time, Aerialite Ore will generate underground.

### The Perforators

*For elaborate strategies on defeating the Perforators, including Weapon and Arena recommendations, see Guide:The Perforators strategies.*

**The Perforators** (Japanese: 穿孔者 *Senkō-sha*) are a trio of fleshy worms, along with a main hive boss, with 9,420 total health split over the 4 bosses (**16,709** in Expert Mode, **21,126** in Revengeance Mode, and **21,630** in Death Mode). It is summoned by using Bloody Worm Food in The Crimson or by killing a Perforator Cyst. The Perforator Hive floats above the player, firing blood clots and ichor blobs in an upward arc. As it loses health, it will spawn Perforator worms of increasing size and strength.
The Perforators drop weapons themed around flesh and blood, as well as Blood Samples, which can be used to craft their drops and other items. After they have been defeated for the first time, Aerialite Ore will generate underground.

### Aquatic Scourge

*For elaborate strategies on defeating the Aquatic Scourge, including Weapon and Arena recommendations, see Guide:Aquatic Scourge strategies.*

 The **Aquatic Scourge** (Japanese: 水生の惨劇 *Suisei no sangeki*) is a mutated oceanic scourge with 80,000 health (**128,000** in Expert Mode, and **147,200** in Revengeance Mode). It can be spawned by throwing 20 Chum Buckets into the Sulphurous Sea biome or very rarely naturally spawning in it. It constantly moves towards the player to ram them, both through the ground and through the air. It periodically vomits bursts of many projectiles, from sulphuric water and gas clouds to homing teeth.
The Aquatic Scourge drops weapons themed around water and electricity, much like the Desert Scourge to which it is the same species. Defeating it for the first time unlocks the second tier of the Acid Rain event.

### Goozma (Pre-Hardmode)

**Goozma** (Japanese: グズマ *Guzma*) is a small/medium-sized slime being encapsulated in green protective armor. It is also currently pre-Hardmode boss who can first be encountered before defeating any other boss, Goozma can be spawned upon dropping an Overloaded Sludge onto King Slime during a Slime Rain, which means that one needs to actively participating in combat with King Slime in order to defeat Goozma.
Goozma the boss is itself composed of the main entity named Goozma, plus four gelatinous slime vassals from different biomes, each about 60% the size of King Slime: the **Ebonmuck Vassal**, **Asgeliath Vassal**, **Crimglop Vassal**, and the **Divingoop Vassal**.
Goozma fights in two phases. First, his four enormous slime vassals will fight first, during which he is invulnerable to all attacks. Defeating all four vassals will then allow the player to defeat Goozma. Despite the large health pool for a late pre-Hardmode boss, Goozma's attacks are weak at this stage, and beating it may actually prove to be easy for most players here.
Goozma drops useful slime-based items, weapons, and accessories upon defeat, which may vary depending on which one of the four vassals was defeated last.

### The Slime God

*For elaborate strategies on defeating the Slime God, including Weapon and Arena recommendations, see Guide:The Slime God strategies.*

**The Slime God** (Japanese: スライムの神 *Suraimu no kami*) is a trio of powerful slimes, consists of two separate, giant slimes named (the Ebonian Slime God and Crimulan Slime God, both the size of King Slime) and a smaller Slime God Core. It has 10,800 total health split over the 3 bosses (**17,280** in Expert Mode, and **23,360** in Revengeance Mode). It is summoned anywhere and at any time with an Overloaded Sludge.
The core itself will fly around very quickly, attempting to charge at the player while leaving most of the fighting to its Ebonian and Crimulan Slime God bodyguards. These slimes will perform great jumps towards the player while firing lingering mines, orbs and summoning their own minions. When they reach half health, they will split into smaller, weaker slime gods that will continue to attack. The Slime Gods will get stronger depending on which one is killed first.
The Slime God drops weapons themed around slime, The Corruption, and The Crimson, as well as Purified Gel, which can be used to craft its drops and several late Pre-Hardmode items. It also drops several units of Purified Jam, an incredibly valuable item that, when used, prevents almost all damage for a short duration.

### Birdest Up, Kulu-Yharon-Ku

*For elaborate strategies on defeating Yharon, including Weapon and Arena recommendations, see Guide:Birdest Up, Kulu-Yharon-Ku strategies.*

**Birdest Up, Kulu-Yharon-Ku** (Japanese: クルルイハロンク (プリックバード) *Kururuiharonku (purikkubādo)*) is a big bird with 20,102,020 health. He is an optional boss summoned in the Desert by throwing Genesis on the floor after hearing an Eric André line. He shouldn't be summoned at the Pre-Hardmode stage, despite him being labeled as a boss of such stage. Kulu-Yharon-Ku immediately runs towards the player in-game and in real life, intent on fracturing the player's skull with a large stone.
He drops Genesis and Auric Tesla Bars, as well as his aggro on you.

## Hardmode Bosses

### Cumulomenace

File:Cumulomenace Trophy.png
*For elaborate strategies on defeating Cumulomenace, including Weapon and Arena recommendations, see Guide:Cumulomenace strategies.*

Cumulomenace drops Aerialite Ore, several aerial-themed weapons of varying classes. as well as a useful mobility accessory.

### Cryogen

*For elaborate strategies on defeating Cryogen, including Weapon and Arena recommendations, see Guide:Cryogen strategies.*

**Cryogen** (Japanese: 寒剤 *Kanzai*) is a crystal of sealed frost magic with 30,000 health (**48,000** in Expert Mode, and **57,600** in Revengeance Mode). It is summoned by using a Cryo Key in the Snow biome or by killing 20  Primal Aspids. It has many phases that it transitions through as it loses health, each with different methods of attack, from firing a barrage of ice blasts to trying to ram the player, all the while summoning minions to assist it.
Cryogen drops ice-themed weapons. Defeating it for the first time will generate Cryonic Ore in the Ice biome and cause the Archmage NPC to move into an available house.

### Pyrogen

*For elaborate strategies on defeating Pyrogen, including Weapon and Arena recommendations, see Guide:Pyrogen strategies.*

**Pyrogen** (Japanese: パイロジェン *Pairojen*) is a crystal of sealed lava magic with 44,000 health (**52,000** in Expert Mode, and **66,000** in Revengeance Mode). It is summoned by throwing a Cryo Key in lava. Much like Cryogen, Pyrogen has multiple phases, and it cycles to the next after a set amount of time has passed. The speed and intensity of each phase increases as the boss loses health. It also spawns with an obsidian shield which destroys all incoming projectiles. Certain attacks will separate Pyrogen from its shield, allowing the player to attack it. Leaving the Underworld (where it is intended to be fought) will cause Pyrogen to enrage, causing its attack speeds to dramatically increase alongside it's phases. The speed of which each attack is performed is also sharply increased under the same conditions.
Pyrogen drops fire-themed weapons. Defeating it for the first time will generate Scoria Ore in the Abyss, if not generated already, and free the Guide NPC to move into an available house, if not freed already.

### Aetherial Guardian, Olistene

File:Olistene Trophy.png
*For elaborate strategies on defeating Aetherial Guardian, Olistene, including Weapon and Arena recommendations, see Guide:Aetherial Guardian, Olistene strategies.*

**Aetherial Guardian, Olistene** (Japanese: イセリアルガーディアン オリステネ *Iseriarugādian orisutene*) is an armored paladin of light with 30,000 health (**50,000** in Expert Mode, and **60,000** in Revengeance Mode). She is summoned by inserting a Rotting Eyeball into a Luminous Altar, which is found in Caelus. Olistene flies around the player, using a variety of light-themed attacks.
Aetherial Guardian, Olistene drops a variety of useful weapons themed around light.

### Brimstone Elemental

*For elaborate strategies on defeating the Brimstone Elemental, including Weapon and Arena recommendations, see Guide:Brimstone Elemental strategies.*

The **Brimstone Elemental** (Japanese: 硫黄のエレメンタル *Iō no erementaru*) is a defiled spirit with 30,000 health (**48,000** in Expert Mode, and **65,600** in Revengeance Mode). She is summoned by using a Charred Idol in the Brimstone Crag biome. She has three different methods of attack which she switches between randomly: teleporting around and leaving behind harmless brimstone eruptions, hovering frantically above the player while shooting fireballs and darts, and encasing herself in highly defensive rose petals while firing blasts of projectiles. She also summons minions called Brimlings that shoot gravity affected brimstone fireballs and follow a similar movement pattern to the Brimstone Elemental's first phase.
The Brimstone Elemental drops brimstone-themed weapons and accessories.
After Providence is defeated, all of her stats are buffed, her health raises to 150,000 (**240,000** in Expert Mode, and **328,000** in Revengeance Mode), and she begins dropping Bloodstone. She also begins dropping the Brimrose, a mount with infinite flight time and high movement speed.

### Calamitas

*For elaborate strategies on defeating Calamitas, including Weapon and Arena recommendations, see Guide:Calamitas strategies.*

**Calamitas** (Japanese: カラミタスのクローン *Karamitasu no kurōn*) is a large scarlet eye with 37,500 total health (**60,000** in Expert Mode, and **72,000** in Revengeance Mode). She is summoned by using an Eye of Desolation at night.
Calamitas behaves much like Retinazer, hovering around the player and firing lasers at them, though her lasers will burst into three fast, homing versions after a short time. Upon reaching 75% of her health, she enrages and begins shooting fireballs. Throughout the fight she summons her brothers Catastrophe and Cataclysm. The brothers will spit fireballs and spew a flamethrower, respectively, and charge toward the player. Calamitas also spawns a ring of Soul Seekers around her and swarms of Life Seekers at half health.
Calamitas drops several calamitous weapons and materials.
After Providence is defeated, all of her stats get buffed, her health raises to 75,000 (**120,000** in Expert Mode, and **144,000** in Revengeance Mode), and she begins dropping Bloodstone.

### Serial Designation N

*For elaborate strategies on defeating Serial Designation N, including Weapon and Arena recommendations, see Guide:Serial Designation N strategies*.

**Serial Designation N** (Japanese: シリアル番号、N *Shiriaru bangō, N*) is a technologically superior robot and a Hardmode boss that has 40,000 total health (**60,000** in Expert Mode and **75,000** in Revengeance Mode). He is required to be summoned with the Disassembly Signal during the Night.
Serial Designation N Behaves similarly to the standard fighter AI, with the addition of faster speeds and dashing. If the player or Serial Designation N are far apart, Then Serial Designation N will Quickly dash towards the player. Serial Designation N will enrage during the day with his movement increasing drastically.
Defeating Serial Designation N will allow the similarly looking Disassembly Drone NPC to move in. If respawning the boss again, the Disassembly Drone will disappear to fight the boss and will only reappear once the player has defeated the boss or has been killed in a subsequent fight and has already fought the boss at least once before.

### The Forbidden Lantern

*For elaborate strategies on defeating The Forbidden Lantern, including Weapon and Arena recommendations, see Guide:The Forbidden Lantern strategies.*

In the boss's first phase it circles around the player shooting slow projectiles, then hovering above the player making crystals rise from the ground.
Upon reaching 50% health, it will start teleporting on the players sides, summoning The Shadow Shatters to help it.
When it reaches 10/15/20/25 % health it will dash the player up and down, making players suffocate.
The boss drops Shattered Prisms and sometimes the Shattered Pistol.

### The Derellect

For elaborate strategies on defeating The Derellect, including Weapon and Arena recommendations, see Guide:Derellect strategies.}}

**The Derellect** (Japanese: デレデレ *Deredere*) is a damaged, mechanical brain with 42,000 total health (**55,000** in Expert Mode and **67,000** in Revengeance Mode) surrounded by it's many Signal Drones. It is summoned by using an Mechanical Worm while the Bloody Vein is equipped. It is intended to be defeated alongside Plantera and Calamitas.
All of Derellect's Signal Drones function as a unit, working together to perform a variety of electrical attacks.
The Derellect will rarely directly attack the player until all it's Signal Drones are defeated, however it will be constantly rejuvenated with heal pulses from its drones if damaged prior. Once alone, however, it will fiercely attack the player with a variety of attacks, all specializing in area denial.
The Derellect drops weapons and items themed around brains and neurosurgery, as well as Souls of Plight, which can be combined with other materials to craft a variety of powerful mage and summoner weapons.

### Polyphemalus

*For elaborate strategies on defeating Polyphemalus, including Weapon and Arena recommendations, see Guide:Polyphemalus strategies.*

**Polyphemalus** (Japanese: ポリフェマルス *Porifemarusu*) is a powerful group of four conjoined eyes, who have a total of 125,000 total health (**?** in Expert Mode, and **?** in Revengeance Mode). It is summoned by using a Fused Eye at Night, all after the Mechanical Bosses have been defeated. Fighting it is not instrumental to game progression. However, if fought, Polyphemalus is intended to be defeated after Plantera, Calamitas, and The Derellect.
Polyphemalus basically acts like a much more powerful version of The Twins. Each of the four eyes has a different coloured iris each corresponding with their attacks. Each eye has a name and shoots different projectiles. The red eye (the one to the right) is named ***Astigamageddon***, who shoots a powerful red laser (similar to Retinazer's) every two frames. The blue eye (the one at the bottom) is named ***Exotrexia***, who shoots an ice wave (similar to the Ice Queen's) every four frames. The green eye (the one at the left) is named ***Conjunctivirus***, who shoots a Cursed Fireball (similar to the Eater of Worlds's) every four frames. The gray eye (the one at the top) is named ***Cataractacomb***, who shoots a seeking Shadow Orb (similar to the Lunatic Cultist clones's) every eight frames. Polyphemalus attacks in five phases, one where each eye is prominent in attacking, and the final "Desperation Phase": Its attacks are based off a repeating 12 second loop- the first nine seconds it attacks you with one eye, based on which phase Polyphemalus is in, and the last three seconds it does a bullet hell attack with all four eyes and rapidly spins (which results in increased damage upon contact). When fought during the day, Polyphemalus enrages and all of its attacks now deal 600 damage and now more frequently unleashes its bullet-hell attack.
Upon reaching less than 5% of its health, Polyphemalus enters its Desperation Phase, whereby it shoots all projectiles randomly chosen from all the vanilla bosses. In this phase, the timer mechanic is abandoned and all of his attacks are in the bullet-hell style, thus making it extremely difficult to defeat while in this phase.
Once its HP bar is depleted, it splits off into its four constituent eyes and immediately performs a coordinated bullet hell surrounding the player. After this, each eye will attack on its own have its own bullet hell and repeat this cycle until their defeat.
Polyphemalus drops the Eye of Cthulhu Mask guaranteed upon its defeat, and also drops the Polypebral Shield if the Eye of Cthulhu was used as an active dash while its battle proceeded. Additionally, Polyphemalus can also be guaranteed to drop one of four weapons (all of different classes) based on which eye was defeated last.

### Leviathan and Anahita

*For elaborate strategies on defeating Leviathan and Anahita, including Weapon and Arena recommendations, see Guide:Leviathan and Anahita strategies.*

**The Leviathan** (Japanese: リヴァイアサン *Rivu~aiasan*) is a colossal aquatic aberration, accompanied by her partner, **Anahita,** (Japanese: アナヒタ *Anahita*) a powerful siren. Anahita has 27,400 health (**43,840** in Expert Mode, and **66,560** in Revengeance Mode) and must be summoned by killing any Ocean enemy with a Wakasagihime. The Leviathan, appearing when Anahita reaches 40% health, has 55,200 health (**88,320** in Expert Mode, and **116,096** in Revengeance Mode). Although intended to be fought after defeating Plantera, they can be summoned at any point in hardmode.
Anahita will periodically generate an ice shield to protect herself, while attacking the player with a variety of projectiles. The Leviathan will spend most of her time at the player's side, repeatedly launching meteors and summoning minions, while occasionally charging into the player. If either of them are defeated, the boss left alive will become enraged, increasing the aggressiveness of their attacks.
The Leviathan (or Anahita, depending on who is killed last) drops ocean-themed weapons and accessories.

### Astrum Aureus

*For elaborate strategies on defeating Astrum Aureus, including Weapon and Arena recommendations, see Guide:Astrum Aureus strategies.*

**Astrum Aureus** (Japanese: 黄色ブドウ球菌 *Kiirobudōkyūkin*) is a massive astral-infected crawler with 89,200 health (**134,400** in Expert Mode, and **171,200** in Revengeance Mode). It is summoned by gathering the Famine Slime, Pestilent Slime, War Slime, and Death Slime within a 10 block radius of the player. It crawls around and occasionally jumps into the air to crush the player. It also fires astral crystals and lasers at varying speeds at the player.
Astrum Aureus drops an abundance of Stardust, Fallen Stars and Aureus Cells as well as unlocking several enemy drops in the Astral Infection. Defeating it for the first time unlocks the Astral Chest in the Dungeon.

### The Plaguebringer Goliath

*For more elaborate strategies on defeating the Plaguebringer Goliath, including weapon and arena recommendations, see Guide:The Plaguebringer Goliath strategies.*

**The Plaguebringer Goliath** (Japanese: 疫病をもたらすゴリアテ *Ekibyō o motarasu goriate*) is a bee-like amalgamation of infected flesh and metal with 81,000 health (**129,600** in Expert Mode, and **170,400** in Revengeance Mode). She is summoned by using an Abombination in the Jungle. Being an infected Queen Bee, she possesses similar attacks, although improved and much more dangerous. Upon reaching half health, The Plaguebringer Goliath will release a Plague Nuke Barrage, launching a multitude of devastating plague missiles in quick succession. She will periodically perform this attack for the rest of the fight.
The Plaguebringer Goliath drops plague-themed weapons and Infected Armor Plating.

### Ravager

*For more elaborate strategies on defeating Ravager, including weapon and arena recommendations, see Guide:Ravager strategies.*

The **Ravager** (Japanese: 破壊 *Hakai*) is an ancient flesh golem with 141,665 total health (**189,525** in Expert Mode, and **206,805** in Revengeance Mode), split across the main boss and its five body parts. It found within the silo in the Bloody Corn Maze . It behaves similarly to the Golem, attempting to jump onto the player and slam back down on them and hit them with its claws. When its claws and feet are destroyed, sparks and fireballs will be shot from the empty sockets. It will also summon large stone pillars, fire-throwing pillars, homing missiles and, after its head is destroyed, bursts of lasers and white bolts in every direction. Each of its five body parts must be destroyed before the body itself can be damaged.
The Ravager drops flesh and bone themed weapons and two powerful accessories: The Flesh Totem, which cuts enemy contact damage in half every 15 seconds, and the Blood Pact, which doubles the player's maximum health, but allows them to be critically hit at a 25% chance. The Ravager also drops all ingredients to the Core of Calamity and also all the ingredients to the Life Alloy.
After Providence is defeated, all of its stats are buffed, its health raises to 708,325 (**947,625** in Expert Mode, and **1,034,025** in Revengeance Mode) total, and it begins dropping Bloodstone. It also begins dropping the Bloodflare Core accessory, which grants benefits based on your current health and defense.

### The Magnificent Lightning Avian

*For elaborate strategies on defeating The Dragonfolly, including Weapon and Arena recommendations, see Guide:The Dragonfolly strategies.*

**The Magnificent Lightning Avian** (Japanese: サンダー *Thunder*) is an electrical bird-like dragon clone that has 170,625 health (**273,000** in Expert Mode, and **303,000** in Revengeance Mode). It can be summoned using Exotic Pheromones in the Jungle. It attacks by flying around and charging incredibly quickly, launching bursts of electric feathers, birthing copies of itself, and creating sustained pillars of lightning.
The Magnificent Lightning Avian drops weapons themed around birds and red lightning, as well as Effulgent Feathers, which are used to craft the Jungle Dragon Egg and the Silva armor.

### Artificial Sentience System, AX-P03

File:Artificial Sentience System, AX-P03 Trophy.png
*For elaborate strategies on defeating Artificial Sentience System, AX-P03, including Weapon and Arena recommendations, see Guide:Artificial Sentience System, AX-P03 strategies.*

To summon this boss requires an elaborate procedure. It is as follows. First, the player needs to equip the Dimensional Communication Transfer Device to an available accessory slot. Then, enter an Arsenal Lab that isn't a Bio-Center, and the following message will appear (unless you defeated Moon Lord) at the center of your screen (command-prompt style) which says `data sent to 'drdn@exOS-hell2' from 'AXP03@exOS-xsphr3'`, indicating that data to a device that contains the summons for AXP-03 has been sent to the player.
In some time, a new message will pop up, which says `success! placed at index:` plus a random hexadecimal number. Here, it is recommended that the player write down this number as it is randomly generated and is unique to each different world. Once this message disappears, the player has exactly six minutes to head to the Bio-Center in the Underworld and locate a computer that displays a green screen (instead of the normal blue screen). If there is no such computer, placing another one inside will get it to display a green screen. Regardless of the computer's initial condition, successful conditions should allow the player to right-click on it, where they will be taken to a command-prompt styled input box at the center of the screen. Typing in the command 'HELP' will display a list of three commands: 'JUMP', 'EXEC' and 'HELP'. It is here that the player types 'JUMP' plus the hexadecimal code that they were given earlier.
If the inputting was successful, it will display `VALID INDEX`. Otherwise, it will display `INVALID INDEX, RETRY`. If successful, the player then types the other commannd 'EXEC'. Upon this success, the input box will now display with the message 'ADDING PERSONAL BLUEPRINTS TO USER... SUCCESS', and the player will get the crafting materials necessary for crafting the Emergency Cortex Transfer Machine, the culmination of this procedure, and the actual summoning device used to spawn AX-P03.
When the player uses the Machine, the screen flashes white, and AXP-03 spawns where it begins with a powerful assault, leaving players vulnerable unless proper precautions are taken.
In its first phase, it surrounds itself with a barricade of 10 Repair Drones, which unless destroyed within 30 seconds will continuously heal 5% health to the boss per drone that survives. AX-P03 will also shoot fast-moving and slow-moving missiles and deploy five drones to attack the player.
Once down to 50% health, AX-P03 goes into its second phase. In addition to having upgraded attacks that were from the first phase, AX-P03 can now also deploy a single Hyper-Neutralizer drone, which homes in towards the player and deals the "HyperNeutralized" debuff upon contact, insta-killing the player. This requires the opposing player to constantly move while fighting so as to not be killed by this drone, which can necessitate the requirement of a large arena and the acquisition of numerous abilities facilitating vast amounts of movement.
AX-P03 doesn't drop anything as of yet.

### Astrum Deus

*For elaborate strategies on defeating Astrum Deus, including Weapon and Arena recommendations, see Guide:Astrum Deus strategies.*

**Astrum Deus** (Japanese: 星の神 Hoshi no kami) is a large metal worm that has 200,000 total health (**320,000** in Expert Mode, and **384,000** in Revengeance Mode). It is summoned by using the Titan Heart or Starcore at the Astral Beacon at night. The worm fires lasers and mines from its segments, and splits into two when under half of its health. In its second phase, defeating either of the worms will end the fight.
Astrum Deus drops astral-themed items and an abundance of Lunar Fragments, as well as allowing Astral Ore to be mined.

## Godseeker Mode Bosses

### Yharim Worm

*For elaborate strategies on defeating Yharim Worm, including Weapon and Arena recommendations, see Guide:Yharim Worm strategies.*

**Yharim Worm** (Japanese: ヤハリムワーム *Yaharimuwāmu*) is a secret Godseeker Mode boss (usually recommended to be the first boss fought after the Moon Lord) that has 690,000 health (**1,380,000** in Expert Mode, and **2,070,000** in Revengeance Mode) and 100 segments in total.
Yharim Worm does not spawn on its own and it requires the player to put a Worm into The Codebreaker or Altar of the Accursed.
Yharim Worm does not drop any items in particular but will drop a superfluous amount of coins.

### Profaned Guardians

*For elaborate strategies on defeating the Profaned Guardians, including Weapon and Arena recommendations, see Guide:Profaned Guardians strategies.*

The Profaned Guardians drop the Profaned Core, which is used to summon their Goddess. Each one can also drop a unique usable "Relic" item: Relic of Deliverance, Relic of Resilience, and Relic of Convergence.

### Providence, the Profaned Goddess

*For elaborate strategies on defeating Providence, including Weapon and Arena recommendations, see Guide:Providence, the Profaned Goddess strategies.*

**Providence, the Profaned Goddess** (Japanese: プロビデンス、冒涜の女神 *Purobidensu, bōtoku no megami*) is a fiery deity of light and dark with 330,000 health (**528,000** in Expert Mode, and **600,000** in Revengeance Mode). She is the first major Godseeker Mode boss, and her defeat causes several prior bosses to be buffed. She is summoned in the Hallow or the Underworld using a Profaned Core. She has many dangerous attacks and several different phases, such as hiding in her cocoon while emitting stars and spears, dropping flare bombs on the player, shooting molten globes, and summoning Profaned Guardians. Additionally, she spawns a large crystal above the player or fires a Holy Ray depending on the biome she is spawned in. During the night, her color changes and her attacks become faster and stronger alongside many other changes.
Providence drops weapons themed around the profaned flame, and an abundance of Unholy Essence and Divine Geodes. If she is spawned in the Hallow, she will drop the highly mobile Elysian Wings. If she is spawned in the Underworld, she will drop the heavily defensive Elysian Aegis. She will always drop the Rune of Kos, a non-consumable item which is used to summon the Sentinels of the Devourer. Uelibloom Ore will generate in Mud Blocks upon her first defeat.

### Ceaseless Void

*For elaborate strategies on defeating Ceaseless Void, including Weapon and Arena recommendations, see Guide:Ceaseless Void strategies.*

**Ceaseless Void** (Japanese: 絶え間ない空白 *Taema nai kūhaku*) is a flying dark portal with 67,200 health (**107,520** in Expert Mode, and **123,648** in Revengeance Mode). It can be summoned by using the Rune of Kos while in the dungeon. Its attacks consist of manipulating Dark Energies to orbit it, or pull them towards it in a spiral pattern.
Ceaseless Void drops Dark Plasma, a material used for the Cosmic Worm and several weapons.

### Storm Weaver

*For elaborate strategies on defeating Storm Weaver, including Weapon and Arena recommendations, see Guide:Storm Weaver strategies.*

**Storm Weaver** (Japanese: ストームウィーバー *Sutōmuu~ībā*) is a cosmic worm with 825,500 health (**1,320,800** in Expert Mode). It can be summoned by using the Rune of Kos while in the sky. It has two different forms and uses lightning bolts to attack, as well as dashing towards the player in phase 2.
Storm Weaver drops Armored Shells, a material used for the Cosmic Worm and several weapons.

### Signus, Envoy of the Devourer

*For elaborate strategies on defeating Signus, including Weapon and Arena recommendations, see Guide:Signus, Envoy of the Devourer strategies.*

**Signus, Envoy of the Devourer** (Japanese: 貪り食う者の使者シグナス *Musabori kuu mono no shisha shigunasu*) is a cosmic wraith with 224,000 health (**358,400** in Expert Mode and **570,240** in Revengeance Mode). It can be summoned by using the Rune of Kos while in the Underworld. It attacks by shooting scythes and Cosmic Mines towards the player, along with spawning Cosmic Lanternas and dashing towards the player.
Signus drops Twisting Nethers, a material used for the Cosmic Worm and several weapons.

### Polterghast

*For elaborate strategies on defeating the Polterghast, including Weapon and Arena recommendations, see Guide:Polterghast strategies.*

**Polterghast** (Japanese: ポルターちゃん *Porutā-chan*) is a ravenous ethereal amalgamation with 350,000 health, **560,000** in Expert Mode, and **672,000** in Revengeance Mode. It can be summoned by killing 30 Phantom Spirits or by using the Necroplasmic Beacon in the Dungeon. It has 3 different forms and various attacks from spitting bouncing bolts and mines to trying to ram into the player and hit them with its hooks, all while summoning minions and clones of itself to assist it.
Polterghast drops phantoplasmic-themed weapons, as well as Ruinous Souls, which are used to craft the Bloodflare armor. Defeating it causes Abyss and Sulphurous Sea minibosses to drop weapons and Adult Eidolon Wyrms to naturally spawn in the lower layers of the Abyss.

### The Starborn Moth

*For elaborate strategies on defeating The Starborn Moth, including Weapon and Arena recommendations, see Guide:The Starborn Moth strategies.*

**The Starborn Moth** (Japanese: スターボーン・フェイ *Sutābōn fei*) is an enormous fairy moth with 419,690 health, **641,880** in Expert Mode, and **775,000** in Revengeance Mode. She can be summoned by using a Celestial Geode in The Hallow during the daytime or in Space at any time. It has two phases and attacks frequently with fairy-themed armaments.
The Starborn Moth drops fairy-themed weapons, accessories, and other such useful items upon her defeat. Additionally, the Starborn Princess spawns inside the player's house as an NPC and the Martian Madness event will be buffed, granting access to Strange Matter.

### Profusion, the Viral God

*For elaborate strategies on defeating Profusion, the Viral God, including Weapon and Arena recommendations, see Guide:Profusion, the Viral God strategies.*

**Profusion, the Viral God** (Japanese: 豊富、ウイルスの神 *Hōfu, uirusu no kami*) is a massive fungal god with 777,000 health, **888,360** in Expert Mode, and **1,300,000** in Revengeance Mode. It frequently bombards the player with multiple phases of various attacks centered around fungal armaments.
Upon its defeat, it drops a wealth of useful Godseeker Mode items related around fungi, including weapons, armor, and accessories.

### The Devourer of Gods

*For elaborate strategies on defeating The Devourer of Gods, including Weapon and Arena recommendations, see Guide:The Devourer of Gods strategies.*

**The Devourer of Gods** (Japanese: 神を食べる者 *Kami o taberu-sha*) is an enormous cosmic worm with a total of 888,750 health (**1,422,000** in Expert Mode, and **1,706,400** in Revengeance Mode). The Devourer of Gods is a difficult boss, requiring significant preparation before attempting to fight, and causing several changes to the world after its defeat. It is summoned with a Cosmic Worm anywhere at any time.
The Devourer of Gods drops cosmic-themed weapons, as well as Cosmilite Bars, a versatile Godseeker Mode material.
After its defeat, the player gains access to Nightmare Fuel, Endothermic Energy, and Darksun Fragments from various now-buffed events.

### Horseslimes of the Goopocalypse

*For elaborate strategies on defeating The Horseslimes of the Goopocalypse, including Weapon and Arena recommendations, see Guide:Horseslimes of the Goopocalypse strategies.*

The **Horseslimes of the Goopocalypse** (Japanese: グーポカリプスのホーススライム *Gūpokaripusu no hōsusuraimu*) are a group of divine slimes that share 1,140,004 health (**1,735,004** in Expert Mode and **2,060,004** in Revengeance Mode) across all bosses and the Horseslime Barriers. They are summoned by using a Gooz Sayer's Coin on an Apocalyptic Slime Statue with a specific structure anywhere at nighttime.
The Horseslimes drop Quark-Gluon Sludge, a valuable Godseeker Mode crafting material.

### Jungle Dragon, Yharon

*For elaborate strategies on defeating Yharon, including Weapon and Arena recommendations, see Guide:Jungle Dragon, Yharon strategies.*

**Jungle Dragon, Yharon** (Japanese: ファイヤー *Fire*) is a godly dragon with 1,080,625 health (**1,729,000** in Expert Mode, and **2,074,800** in Revengeance Mode). He is summoned with a Jungle Dragon Egg in the Jungle.
Yharon is incredibly powerful and has dozens of attacks and several phases, each harder than the last. Some of his attacks include summoning massive flarenados, ramming at great speeds, and creating many rings of fireballs while flying in quick loops. After defeating his first phase, his second phase begins with Yharon regaining his health, and then assaults the player with a new set of attacks including launching fireballs, creating rings of flares, and charging alongside teleports.
Jungle Dragon, Yharon drops weapons themed around dragons and fire. When defeated for the first time, Auric Ore, one of the final crafting materials, will generate underground.

### The Wall of Bronze

*For elaborate strategies on defeating The Wall of Bronze, including Weapon and Arena recommendations, see Guide:Wall of Bronze strategies.*

**The Wall of Bronze** (Japanese: 青銅の壁 *Seidō no kabe*) is a giant bronze structure with 1,500,300 total health (**2,200,000** in Expert Mode and **2,880,090** in Revengeance Mode). It is summoned by placing a Bloody Vein in the Ancient Console. It is intended to be fought before the The Fabricational Quartet, XP-00 Hypnos, and Supreme Calamitas.
The Wall of Bronze uses its many regenerating weapons to attack the player, gaining an invulnerable shield if too many are alive at once. It can also summon minions to assist in disposing of the player.
The Wall of Bronze drops some of the strongest Tools in the game, and will generate the Frozen Hell biome upon death.

### The Wall of Gifts

**The Wall of Gifts** (Japanese: プレゼントの壁 Purezento no kabe) is a giant festive structure with 1,500,300 total health (**2,200,000** in Expert Mode and **2,880,090** in Revengeance Mode). It is summoned by throwing the General Voodoo Doll into lava while in Frozen Hell during the Christmas event.
The Wall of Gifts uses its many regenerating weapons to attack the player, gaining an invulnerable shield if too many are alive at once. It can also summon minions to assist in disposing of the player.
The Wall of Gifts drops presents :) Yippie!

### The Fabricational Quartet

*For elaborate strategies on defeating the The Fabricational Quartet, including Weapon and Arena recommendations, see Guide:The Fabricational Quartet strategies.*

The **The Fabricational Quartet** (Japanese: 捏造カルテット *Netsuzō karutetto*) are a trio of Exo Mechs, namely Ares, Apollo and Artemis, and Thanatos, and they are the creations of **Draedon**, a master blacksmith and cyborg scientist. They overall have 3,600,000 health (**5,760,000** in Expert Mode, and **6,624,000** in Revengeance Mode). They are summoned anywhere by pressing the Contact button on a fully completed Codebreaker. The three The Fabricational Quartet are upgraded versions of the three Mechanical bosses (which are themselves upgraded versions of pre-hardmode bosses—The Twins are an upgrade of Eye of Cthulhu, Skeletron Prime is an upgrade of Skeletron, and The Destroyer is an upgrade of Eater of Worlds), with similar designs to the originals—Apollo and Artemis are inspired by The Twins, Ares by Skeletron Prime, and Thanatos by The Destroyer—but with unique attacks and an intricate fight progression that the player has influence over.
Each mech drops their own set of complex mechanical weaponry, as well as Exo Prisms, which are used to craft Draedon's Forge and Miracle Matter, and therefore the ultimate Exo weapons.

### XP-00 Hypnos

*For elaborate strategies on defeating XP-00 Hypnos, including Weapon and Arena recommendations, see Guide:XP-00 Hypnos strategies.*

**XP-00 Hypnos** (Japanese: XP-00 ヒュプノス *XP - 00 hyupunosu*) is a highly technological and massive mechanical brain with an exposed purple eye, having 1,320,000 health (**2,112,000** in Expert mode, and **3,168,000** in Revengeance mode). It is another one of Draedon's creations, serving as an optional, alternate version of the The Fabricational Quartet fight, where the player faces against one single mech instead of four. It can be summoned anywhere by pressing the Contact button on a fully completed Codebreaker with a Bloody Vein inserted. Hypnos fights by summoning a storm of XP-00 Hypnos Aergian Neurons to help it, along with occasionally performing attacks itself.
Like the The Fabricational Quartet, Hypnos drops complex mechanical weaponry, as well as Exo Prisms, which are used to craft Draedon's Forge and Miracle Matter, and therefore the ultimate Exo weapons.

### Supreme Calamitas

*For elaborate strategies on defeating Supreme Calamitas, including Weapon and Arena recommendations, see Guide:Supreme Calamitas strategies.*

**Supreme Calamitas** (Japanese: カラミタス *Karamitasu*) is an incredibly powerful brimstone witch. She has 1,000,000 health (**1,600,000** in Expert Mode, and **1,840,000** in Revengeance Mode). She is summoned at an Altar of the Accursed at any time with Ashes of Calamity or Ceremonial Urn in the player's inventory. Supreme Calamitas' attacks are primarily enormous waves or floods of projectiles which are very difficult to dodge, which become more chaotic and introduce more elements as the fight progresses. She also summons servants to aid her, such as her brothers (Supreme Catastrophe and Supreme Cataclysm), Soul Seekers, and Sepulcher.
She drops royal items themed around hatred and the occult, as well as the Ashes of Annihilation crafting material, which are used alongside Exo Prisms to craft Shadowspec Bars, the final crafting material.
After her defeat, the lookalike Brimstone Witch town NPC will spawn, allowing the player to utilize the Enchantment system to significantly modify or even transform their items.

### XB-10 Losbaf

File:Losbaf Trophy.png
*For elaborate strategies on defeating XB-10 Losbaf, including Weapon and Arena recommendations, see Guide:XB-10 Losbaf strategies.*

**XB-10 Losbaf** (Japanese: XB-10 ロスバフ *XB - 10 rosubafu*) is a highly technological amalgamation whose tech is based on the original trio of The Fabricational Quartet, serving as a culmination of Draedon's expertise, with 1,980,000 health (**2,640,000** in Expert mode, and **3,300,000** in Revengeance mode). It is summoned anywhere by pressing the Contact button on a fully completed Codebreaker with a single Shadowspec Bar inserted. Losbaf fights with a continuous barrage of lasers and scythes dealing high damage, which could overwhelm the player if they aren't fully ready to fight. Losbaf also summons a horde of Losbaf Peepers, serving as high-output minions contributing to this barrage of numerous projectiles. Additionally, Losbaf occasionally teleports to the corner of the screen and shoots a four-pronged deathray.
Losbaf enrages when the player leaves the range of the deathray. When Losbaf is enraged, its attacks will deal triple the damage and Losbaf gains 90% damage reduction until the players returns.
Losbaf fights in two phases, and deals more overall damage with the second (activated at 50% health) given more projectiles. Revengeance Mode also grants Losbaf a third phase which can be activated at 25% health with yet more projectiles and Losbaf Peepers.
Upon defeat, Losbaf drops powerful Exo-themed weaponry and other accessories.

### XC-39 Oizys

File:Oizys Trophy.png
*For elaborate strategies on defeating XC-39 Oizys, including Weapon and Arena recommendations, see Guide:XC-39 Oizys strategies.*

**XC-39 Oizys** (Japanese: XC-39 オイジーズ *XC - 39 oijīzu*) is an incredibly powerful Exo Mech entirely based around Supreme Calamitas. She has 2,400,000 health (**3,600,000** in Expert Mode, and **4,200,000** in Revengeance Mode). She can be spawned at any time by pressing the Contact button on a fully completed Codebreaker with the Brimstone Locus and an Auric Quantum Cooling Cell inserted. Upon successful completion, the Contact button will lead to summoning one boss, Oizys herself. Much like Supreme Calamitas, Oizys creates a walled space around the player from which the player would need to attack, dodging her many projectile and laser-based attacks in both phases. In the first phase, Oizys randomly cycles through various attacks and overheats for 10 seconds when she cycles through all of them, from which she attacks again. If in Revengeance mode, Oizys has a nuke attack. If in Death Mode, she also gains the ability to attack and cover the entire screen with a holographic sword resembling the Murasama, from which the only way the player would survive would be to use i-frame-based dash-shields.
While in the first phase, Oizys has 50% damage reduction by all players' attacks, making it extremely difficult to sustain a long duration of fighting without the proper gear. However, her brief overheating (after one cycle of all the attacks) will make her extremely vulnerable, and all players' attacks will instead deal 100% more damage.
When her health drops down to 55%, she charges up and coats the world in extremely bright light. When the light dies away, Oizys fights again with renewed energy and with massively buffed attacks, as well as a reduced overheat time of five seconds. She also summons eight Ferum Seekers that repeatedly shoot Exo Darts at the player. If in Revengeance Mode, Oizys also summons her two yet unnamed brothers, like Supreme Calamitas, but which cannot be damaged and only serve to aid her through her fight until her defeat.
She drops Exo Prisms and Ashes of Annihilation upon her defeat, good for crafting a wide variety of powerful endgame items.

### Goozma (Godseeker Mode)

**Goozma** (Japanese: グズマ *Guzma*) is a giant awakened eldritch slime (donning a new look after breaking out of its green shell) and Godseeker Mode boss, now with 5,000,000 total health (**7,500,000** health in Expert Mode, and **10,000,000** health in Revengeance Mode). In this form, Goozma is the penultimate boss of the Calamity mod, excluding Superbosses. The awakened Goozma will spawn upon defeating Moon Lord, with a much larger size and more powerful stats and attacks. The awakened Goozma is recommended to be fought after defeating XC-39 Oizys, as its attacks this time can deplete the players' health quite fast even with adequate protection. Goozma can be spawned upon dropping an Overloaded Sludge onto King Slime during a Slime Rain, which means that one needs to actively participating in combat with King Slime in order to defeat Goozma.
Goozma the boss is itself composed of the main entity named Goozma, plus four gelatinous slime vassals from different biomes, each now twice the size of King Slime: the **Ebonmuck Vassal**, **Asgeliath Vassal**, **Crimglop Vassal**, and the **Divingoop Vassal**. They spawn with much the same behavior as their pre-Hardmode predecessors, but are much larger than size and more powerful than them, and they can slay the player swiftly if taken off-guard.
Goozma fights in two phases like its pre-Hardmode form. First, his four enormous slime vassals will fight first, during which he is invulnerable to all attacks. Defeating all four slime bosses will then allow the player to defeat Goozma.
Goozma drops powerful slime-based endgame items, weapons, and accessories upon defeat, which may vary depending on which one of the four vassals was defeated last.

### Godseeker, Yharim

*For elaborate strategies on defeating* Godseeker, Yharim*, including Weapon and Arena recommendations, see Guide:Godseeker, Yharim strategies.*

He drops powerful endgame weapons and items upon his defeat.

## Epilogue (Superbosses)

### Adult Eidolon Wyrm

The **Adult Eidolon Wyrm** (Japanese: ゴーストリヴァイアサン *Gōsutorivu~aiasan*) is a giant wyrm with 2,100,000 health, **3,360,000** in Expert Mode, and **3,864,000** in Revengeance Mode, with 40% damage reduction. It can be spawned by using the Rod of Discord in Level 4 of the Abyss. It is currently one of eight Superbosses in the Calamity Mod and thus one of the mod's most challenging opponents so far.
The Wyrm drops mainly Subnautical Plates (after the player defeats the Moon Lord), which can be crafted into a variety of powerful endgame weapons.

### Vision of the Tyrant

**Vision of the Tyrant** (Japanese: 暴君のビジョン *Bōkun no bijon*) is a ghastly figure with 2,000,000 health, **2,800,000** in Expert Mode, and **3,200,000** in Revengeance Mode. It is summoned during the final wave of the Boss Rush. It attacks by cycling through the AI's of other enemies and bosses, along with gaining unique passive abilities based on active curses. It is currently one of eight Superbosses in the Calamity Mod and thus one of the mod's most challenging opponents so far.
Vision of the Tyrant drops the Rock and Genesis, the summoning item for The Entropic God, Noxus.

### The Entropic God, Noxus

**The Entropic God, Noxus** (Japanese: 混沌の神、ノクサス *Konton no kami, nokusasu*) is a giant god of chaos with 3,750,440 health, **5,630,000** in Expert Mode, and **7,120,500** in Revengeance Mode. He can be spawned by using Genesis after the player defeats the Boss Rush in a world for the first time. It is currently one of eight Superbosses in the Calamity Mod and thus the most challenging *playable* opponent so far.
All of his attacks, including contact damage, ignore immunity frames, and many players even with endgame equipment will die to this boss due to his high damage output. He spawns Chaos Constructs, which also have his high-damage properties. All heart pickups now hurt instead of heal the points they give, and Noxus will one-hit the player if they stray too far from him.
Noxus drops Shadowspec Bars ready-made (if the player doesn't want to craft any from their component materials), which can be useful in crafting very powerful endgame weapons or accessories. He is perhaps most known for dropping the Noxus Sprayer, despawning any mob, NPC, boss, or player if they get sprayed, which imitates Noxus' ability of one-shotting any player.

### Disgusting Creature: Dron

The **Disgusting Creature: Dron** (Japanese: 嫌な生き物：ドローン *Iyana ikimono: Dorōn*) is a Draedon-esque post-Noxus Superboss that can be summoned, having 3,000,000 health, **4,000,000** in Expert Mode, and **4,230,003** in Revengeance Mode. It is intended to be one of the final bosses fought by the player and is considered to be one of the hardest bosses added by the Calamity Mod but is also a joke character, being a caricature of Draedon.
Dron does not spawn on its own and spawns only if the player uses the Draedon Power Pie.

### Esserwyrm

The **Esserwyrm** (Japanese: エッサーワーム *Essāwāmu*) is a massive post-Noxus Superboss that spawns in the Sky Abyss biome; the boss has 6,800,000 health, **8,600,000** in Expert Mode, and **10,400,000** in Revengeance Mode. It was a former miniboss but was upgraded to the Superboss status to take the place of the Abyssal Jewel in the boss progression when the latter was inexplicably removed.
The boss drops various Abysscent weapons and Esseric Scales. It is currently one of eight Superbosses in the Calamity Mod and thus one of the mod's most challenging opponents so far. It is particularly known for destroying other creatures around it to heal itself, making the Esserwyrm extremely tough to fight.
Defeating this boss generates Stiriatic Ore in the Cavern Layer.

### Reactive Guardian, Sodis

The **Reactive Guardian, Sodis** (Japanese: リアクティブガーディアン、ソディス *Riakutibugādian, sodisu*) is a post-Noxus human-mantis hybrid Superboss, with 6,400,000 health, **8,400,000** in Expert Mode, and **10,400,000** in Revengeance Mode.
Sodis does not spawn on its own and will spawn if the player throws the Artificial Reactive Matter onto a fully completed Aquatic Hypercomputer.
When spawned, a glowing sphere will appear above the computer, and the boss will jump from the ground and steal it.

### Nihil, the Fathomless Seeker

**Nihil, the Fathomless Seeker** (Japanese: ニヒル、底知れぬ探求者 *Nihiru, sokoshirenu tankyū-sha*) is an optional post-Noxus Superboss with 8,000,000 health (**13,600,000** in Expert Mode, **18,330,000** in Revengeance Mode and **21,660,000** in Death Mode). It is summoned by using Genesis whilst Delicious Meat is in the first slot of the hotbar only at night and only if The Entropic God, Noxus has been defeated. Nihil succeeds Noxus as one of the hardest enemies in the mod.
Defeating Nihil causes some changes to Boss Rush and the Sky Abyss biome. Beyond that, it is merely a more difficult challenge.

### Exodygen

**Exodygen** (Japanese: 外酸素源 *Soto sanso-gen*​) is a giant flying god of slime with 20,000,000 health, **25,000,000** in Expert Mode and **30,000,000** in Revengeance Mode. lt can be fought anywhere at any time. It can be fought after the Boss Rush event as its summon item requires the Rock. lt is aIso recommended that this boss be fought at a point of progression beyond the defeat of The Entropic God, Noxus. It is currently one of eight Superbosses in the Calamity Mod and thus one of the mod's most challenging opponents so far.
Once defeated. the Sloome NPC spawns along with powerful endgame items.
Exodygen does not spawn on its own and will spawn at anytime if the player uses the Eschaton.
When spawned, the screen violently shakes followed with a bright flash where Exodygen spawns. After a short amount of time passes, the fight will begin and the world will be tinted with alternating colors.

## Mini Bosses

### Giant Clam

It drops the Giant Pearl in Pre-Hardmode. In Hardmode, it additionally drops Mollusk Husks, the Poseidon, the Clamor Rifle, the Shellfish Staff, and the Clam Crusher. It also drops the Sea King if he is not already present in the world.

### Cyber Draedon

He drops a large amount of Dubious Plating and Mysterious Circuitry, as well as several otherwise non-renewable Arsenal Lab items.

### Clamitas

It drops the Brimstone Sword in Pre-Hardmode. In Hardmode, it additionally drops Mollusk Husks, and several weapons.

### Earth Elemental

It drops earth and rock related weapons like the Aftershock, Slag Magnum and Earthen Pike, as well as the Arid Artifact which starts a Sandstorm shortly after use.

### Aether Valkyrie

She drops the Eye of the Storm, which summons a friendly Aether Valkyrie and can be crafted into the Heart of the Elements, as well as the Storm Saber.

### Cragmaw Mire

It drops the Spent Fuel Container and the Nuclear Rod.

### Armored Digger

It drops Demonic Bone Ash, Dubious Plating, Mysterious Circuitry, and occasionally, Draedon's Remote which summons buffed variants of the three Mechanical Bosses.

### Great Sand Shark

The **Great Sand Shark** (Japanese: 偉大なシロザメ *Idaina shirozame*) is a vicious Sandstorm shark mini-boss with 8,000 (**12,800** / **17,600**) health. It swims through the sand and leaps out to attack the player with special movements, while summoning Sand Sharks to assist it. It either spawns after killing 10 Sand Sharks, or is summoned by using a Sandstorm's Core in the Desert.
It drops a Grand Scale, which can be used to craft powerful upgrades to previous weapons.

### Plaguebringer

It drops an abundance of Plague Cell Canisters, which can be crafted into several plague-related items. It also occasionally drops the Plagued Fuel Pack, a rogue-based accessory.

### Yggdrasil Ent

It drops the Profaned Shard needed to fight the Profaned Guardians, as well as a modest amount of Unholy Essence and a large amount of Pearlwood.

### Plague Emperor

It drops a hefty amount of Luminite Bars without needing to refight the Moon Lord as well as several plague materials.

### Charm Gar

The **Charm Gar** (Japanese: チャームガー *Chāmugā*) is a bloodflare gar mini-boss with 65,000 (**95,000**) health. It attacks by lunging at the player and launching homing bombs towards them. It is spawned through Fishing on the Surface during a Blood Moon after Providence, the Profaned Goddess has been defeated.
It drops Blood Orbs, Bloodstone, and Bloodstone Bars, it can also drop the Bloodflare Rod, a useful Godseeker Mode Fishing Pole.

### Distortion Essence Sphere

The **Distortion Essence Sphere** (Japanese: ディストーションエッセンススフィア *Disutōshon'essensusufia*) is an essence containing mech mini-boss with 150,000 (**175,000**) health. It attacks through summoning Cosmic Guardians and dashing at the player, summoning Black Holes, and creating Laser Beams. It spawns during wave 5 and later waves (with reduced stats) in the post-Starborn Moth Martian Madness event. It can also be spawned manually outside the event with a Cosmic Entangler.
It and the Mechawyrm drop Arean Conduit Plating, a valuable Godseeker Mode tile and crafting material.

### Mechawyrm

The **Mechawyrm** (Japanese: メカワーム *Mekawāmu*) is a harsh mechanical serpentine mini-boss with 700,000 (**950,000**) health. It attacks through charging, breathing ghastly flames, and raining beams and blasts around players. It spawns during wave 8 and later waves (with reduced stats) in the post-Starborn Moth Martian Madness event. It can also be spawned manually outside the event with an Interplanetary Worm Food.
It and the Distortion Essence Sphere drop Arean Conduit Plating, a valuable Godseeker Mode tile and crafting material.

### Empyreon

**Empyreon** (Japanese: エンピレオン *Enpireon*) is a large celestial saucer with 400,000, **600,000** in Expert Mode, and **725,000** in Revengeance Mode. It spawns during the final wave of the post-Starborn Moth Martian Madness event or can be summoned manually outside of the event with an Astral Communicator.
It drops Strange Matter, a valuable Godseeker Mode crafting material that can be used to craft various items alongside Arean Conduit Plating.

### Mauler

It drops several Shark Fins, as well as the Sulphuric Acid Cannon after Polterghast has been defeated.

### Colossal Squid

It drops lots of Black Ink, as well as the Calamari's Lament after Polterghast has been defeated.

### Reaper Shark

After Polterghast has been defeated, it drops the Valediction, Deep Sea Dumbbell, and Reaper Teeth, along with Anechoic Coating.

### Eidolon Wyrm

The **Eidolon Wyrm** (Japanese: 若い幽霊リヴァイアサン *Wakai yūrei rivu~aiasan*) is a large ghostly serpent mini-boss. It has 160,000 (**320,000**) health. They initially float nearby the player and deal no damage, but will become hostile if attacked. They attack by dealing contact damage with their heads, as well as summoning ice shards and streaks of lightning. It appears in the two lowest layers of the Abyss.
They drop an abundance of Lumenyl, Ectoplasm and Voidstone, as well as the Soul Edge and the Eidolic Wail after Polterghast has been defeated.

### Nuclear Terror

It drops the Phosphorescent Gauntlet and the Gamma Heart upon defeat.

### La Ruga

It drops the Terminus and a couple other miscellaneous items upon defeat.

### Lav'e Rugamarius

**Lav'e Rugamarius** (Enchanting Table: ∷ᒷᓵꖌ𝙹リ╎リ⊣ ᓭℸ ̣ ᔑ╎リ 𝙹⎓ ⊣𝙹↸ *"The Reckoning Stain of God"*) is a deformed humanoid centipede mini-boss with 600,000 (**645,000**) health. It fights by crawling towards the player, dealing percentage-based damage, and using its hands to either swat at the player or push them into its mouth. It does not spawn on its own and only appears when right-clicking La Ruga with a piece of Scoria Ore after it spawns on the surface when it has been defeated once.
It unlocks the monitor room in the Exosphere Lab when defeated.

### Primordial Rainbow Slime

It drops an abundance of ores, as well as Primordial Ore when killed with any weapon that is crafted with Miracle Matter.

## Unimplemented/Removed Bosses and Superbosses

### Astrageldon Slime

The **Astrageldon Slime** (Japanese: アストラゲルドン *Asutoragerudon*) was a massive astral-infected slime with 61,000 health (**97,600** in Expert Mode, and **129,720** in Revengeance Mode), and was the predecessor boss to Astrum Aureus. It can be summoned at Night using the Astral Chunk. Despite being connected to the Astral Meteor biome, it could be summoned anywhere. It behaved similarly to most Slimes and attempted to leap towards the player. Its damage, defense, movement speed and firing speed increased significantly as its health lowered. The Astrageldon Slime itself was massive, roughly twice as big as King Slime. Like King Slime, it'd teleport near the player if the player got too far away.
It drops an abundance of Stardust, Fallen Stars and Astral Jelly. After Moon Lord has been defeated, it gains a major stat boost and drops the Suspicious Looking Jelly Bean mount, and also drops all four types of Lunar Fragments.
After the Moon Lord is defeated, all of its stats are buffed, except for its health which still raises to **640,000** total but only for Revengeance Mode, and all of its attacks are massively buffed regardless.

### The Old Duke

**The Old Duke** (Japanese: 老公爵 *Rō kōshaku*) was an old Fishron with 412,500 health (**660,000** in Expert Mode, and **792,000** in Revengeance Mode), intended to be defeated after fighting all three Sentinels of the Devourer but just before Polterghast. The Old Duke spawned after completing the Acid Rain event or could be summoned by fishing with a Bloodworm. It had 3 phases and multiple attacks, which ranged from charging at the player to creating a massive sulphurous vortex. Its main mechanic was accounting for the player's movement before charging, essentially predicting where the player will move towards.
He was removed in an update supposedly as it "didn't match the direction of development" of the mod, and a visually identical sprite was reused for Duke Fishron but when fought at the Sulphurous Sea.
The Old Duke dropped sulphur-themed weapons.

### Ancient Doomsayer

The **Ancient Doomsayer** (Japanese: 古代の予言者 *Kodai no yogen-sha*) was one of three Future bosses, and a more powerful variation of the Lunatic Cultist, summoned using the Eldritch Soul Artifact, with a total of 1,930,000 health, **3,088,000** in Expert Mode, and **3,248,000** in Revengeance Mode. It is intended to be fought after Supreme Calamitas has been defeated.
The Ancient Doomsayer performed the same attacks as its weaker incarnation, but with greatly increased strength, speed, and amount of attacks and their projectiles. It was able to use all of the attacks in its arsenal regardless of its current health, including Ancient Light, which lingered in the air for far longer and moved much faster, and Ancient Doom. Its fireballs and Prophecy's End attacks were much faster as well. The clones it summoned were identical to the Ancient Doomsayer in appearance, the real one only differentiated from them by the presence of a health bar.
Upon its defeat, it dropped 1-15 Lesser Healing Potions.

### The Devourer of Universes

**The Devourer of Universes** (Japanese: 宇宙を食べる者 *Uchū o taberu-sha*) was one of three Future bosses, and a more powerful variation of The Devourer of Gods, summoned using the Dimensional Soul Artifact, with a total of 1,650,000 health, **2,640,000** in Expert Mode, and **3,000,000** in Revengeance Mode. It is intended to be fought after Supreme Calamitas has been defeated.
The Devourer of Universes was always in its final form (second form), and used its laser wall attacks throughout the entire fight, during which it would always be visible even when invulnerable. The boss's speed had been increased dramatically, and its laser wall attacks were more frequent, more random, and had less room for error. Regardless of the world's chosen difficulty, contact with The Devourer of Universes' head would have instantly killed the player.
It was not known what it dropped upon its defeat.

### Dragon God, Yharon

**Dragon God, Yharon** (Japanese: 龍神ヤハロン *Ryūjin yaharon*) was one of three Future bosses, and a more powerful variation of Jungle Dragon, Yharon, summoned using the Godly Soul Artifact, with a total of 5,343,750 health, **8,550,000** in Expert Mode, and **9,450,000** in Revengeance Mode. He is intended to be fought after Supreme Calamitas has been defeated.
He began in his first subphase and transitioned to his third subphase at 98% health, summoning Infernadoes, spewing fireballs, and flying at extreme speeds. He remained this way for the majority of the first phase, before transitioning into his teleporting fourth subphase at 30% health. His second phase began in its most difficult pattern, and continued to be as such for the remainder of the fight.
Upon his defeat, he dropped 1-15 Omega Healing Potions.

### Abyssal Jewel

The **Abyssal Jewel** (Japanese: 深淵の宝石 *Shin'en no hōseki*) was a massive post Noxus Superboss that can be summoned in the Sky Abyss biome; the boss has 4,100,000 health, **6,500,000** in Expert Mode, and **8,500,000** in Revengeance Mode. The boss drops various Abysscent weapons. It was one of six Superbosses in the Calamity Mod and thus one of the mod's most challenging opponents so far.
Abyssal Jewel does not spawn on its own and spawns in the Sky Abyss biome if the player uses the Expensive Jewelry.

### THE LORDE

**THE LORDE** (Japanese: いやいやいやいやいや *Iyaiya iyaiya iya*) was a Godseeker Mode Superboss that is no longer available in the main mod but was made available again through the "Apotheosis and Friends" mod. It was and is to be considered one of, if not the most difficult though mainly unplayable boss in the Calamity Mod. It was summoned using NO (dropped by BOHLDOHRs after Supreme Calamitas was defeated), with a total of 25,000,000 health, **?** in Expert Mode, and **?** in Revengeance Mode. It is intended to be fought after every other boss and Superboss in this mod plus all related community-produced mods have been defeated.
Every single frame, its AI had a chance to change into another AI. All of the possible AIs it could change into were vanilla AIs. This also meant that it could potentially spawn other enemies, like boss minions, or even despawn due to how the AI works. While THE LORDE was alive, all damage that the player received would be multiplied by 6.9, and taking damage from any source would inflict the NO U debuff on the player, which completely disabled the player's armor and accessories. When THE LORDE's health fell to or below 500,000, it stopped taking damage from any attacks. This effect disappeared after 100 seconds, rendering it vulnerable again.
Upon his defeat, he dropped 2,000 Platinum Coins.

## Vanilla Boss Additions

The Calamity Mod adds several differences to vanilla bosses ranging from drops to behavior in other difficulty modes.

 This table requires JavaScript to be enabled and site tooltips to be turned on to be displayed.You can also view the data on another page.

### Resistances

The Calamity Mod also modifies the amount of damage certain projectiles do to certain bosses.

* All segments of The Destroyer take half damage from non-minion piercing projectiles. Additionally, they take:
	+ 75% damage from the Spear of Paleolith's shards, the Desecrated Water's bubbles, the Kelvin Catalyst's stars and the rainbow trails from the Cosmic Rainbow.
	+ 50% damage from the Dormant Brimseeker.
	+ 38% damage from the Spent Fuel Container's explosions.
	+ 25% damage from the Sea's Searing tornadoes.
* All segments of the Eater of Worlds take 60% damage from non-minion piercing projectiles. Additionally, they take:
	+ 70% damage from the beams from the Sparkling Empress.
* The Lunatic Cultist takes 75% damage from the Resurrection Butterfly.
* Duke Fishron takes 135% damage from the Resurrection Butterfly.

## Boss Summoning Items

The Calamity Mod changes most vanilla boss summoning items to be non-consumable: Slime Crown, Suspicious Looking Eye, Worm Food, Bloody Spine, Abeemination, Mechanical Eye, Mechanical Worm, Mechanical Skull, and Celestial Sigil.

Calamity adds three additional summoning items for vanilla bosses: Portabulb for Plantera, Old Power Cell as a reusable summon for Golem, and Eidolon Tablet for Lunatic Cultist. Recipes for the Guide Voodoo Doll, Lihzahrd Power Cell, and Truffle Worm are also added.

Some town NPCs sell boss or event summoning items after that boss or event has been defeated in the world.

## See Also

* Bosses on the vanilla wiki.
* The lore associated with these bosses.
* Boss Rush