Arras.io - Siege

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DIEP.IO WIKI

Siege
EDIT

ARENA CLOSURE:
When all Sanctuaries are destroyed for over a minute.

1. OF TEAMS:

BOSSES SPAWN?
SPECIAL TANKS:
1 (2 if including the Bosses
Yes
Healer branch

Sanctuaries
Rogues

Siege, originally known as Boss Event and also known as Winter Mayhem during the Winter Mayhem event, is a game mode in Arras.io where players have to defend four Sanctuaries from an infinite waves of Bosses. This gamemode was added on May 9, 2020 as Boss Event, then removed the next day. However, due to many players wanting it to be brought back permanently, it was re-added to the game on June 23 of the same year. Since then, it has been updated and reworked many times. This gamemode features many Bosses exclusive to this mode, such as the Celestials, which are usually extremely powerful and requires a large team of players to take down, with the aid of Sanctuaries and Healer branch tanks.

Map
There are a few different possible map generations in Siege. All maps feature red bases and four blue bases, along with four Sanctuaries. The blue bases serve as the spawn points for the tanks and has a Sanctuary placed in the center of each base. When the Sanctuary is destroyed, the base becomes yellow and the Sanctuary turns into a defenseless Dominator. The red bases, or barriers, serve as a gateway that allows the Bosses to enter the map but not let any tanks out. Therefore, it deals extremely high amounts of damage to any player that touches it, usually killing them in less than a second. The bosses themselves don't actually spawn in the base, however; they spawn behind them. All maps currently lack a Pentagon Nest. This is to prevent any Polygons, Sentries, Crashers, or Sentinels from spawning in the middle of the map during or between waves.
The map of a currently ongoing Siege game is displayed on the server/gamemode selector on the main screen of Arras.io. For example, a Siege game with the Citadel map would have its name show up as "Siege Citadel" instead of just "Siege".
Siege currently has three maps:
Fortress - This map is similar to the original map of Siege. Maze walls form a box-like shape around the playable boundaries and a Sanctuary is placed near each corner. The red bases are at the North, South, East, and West openings, and the bosses will spawn behind them. This map is slightly larger than Citadel but still smaller than Blitz.
Citadel - Similar to the Fortress map, the playable boundaries are boxed in by maze walls. The Sanctuaries are positioned at the North, South, East, and West, near where the red bases are in the Fortress map. At each corner, the maze walls are replaced by red bases. The bosses spawn near the corners of the entire map, entering the playable boundaries through the red bases. This map is the smallest out of all three Siege maps.
Blitz - The Blitz map has all four Sanctuaries placed top to bottom at the right side of the map. Near the center of the map, a vertical line-like red base is there. The bosses can spawn anywhere to the left of the red base. Similar to the other maps, the playable boundaries are marked by a box-like formation of maze walls. However, unlike the other maps, there is no opening. This map is significantly larger than Citadel or Fortress.
It is possible that there are Anti-Tank Machine Guns positioned outside the playable boundaries to terminate any players that somehow manage to get out of the map, as they have been placed there in the past. However, they have not been spotted in any of the current maps as of now, so it is unknown if they exist. Players that did manage to escape the playable boundaries claim that they ran into an "Invisible Wall" that dealt damage and killed them. This suggests another possibility of an invisible version of the red damage walls from Magic Maze that are surrounding the playable boundaries. This is unconfirmed and does not rule out the possibility of Anti-Tank Machine Guns being present outside of the maze walls.
Sanctuaries
In Siege, there are always four Sanctuaries present, regardless of the game's current map or wave.
Waves
In Siege, the bosses and enemies spawn in waves. During the earlier waves, not many enemies or strong bosses spawn, but later in the game, each wave can spawn extremely high amounts of enemies. There are also some special waves where only specific types of bosses can spawn. There is an infinite number of waves and each wave is randomized, but there are some key moments in Siege where certain bosses, certain types of bosses, or certain amounts of enemies are spawned. Most of the earlier waves tend to be pre-set.
Waves 1-4
The Sanctuaries are at Tier 1. Only Elite Crashers and Elite Skimmers can spawn in very low numbers.
Waves 5-9
At the start of Wave 5, the Sanctuaries are upgraded to Tier 2, and the Mystical bosses are introduced. The bosses still spawn in groups of no more than 5. It is likely for a Mysterious Egg to spawn during those waves.
Waves 10-14
At the start of Wave 10, the Sanctuaries are upgraded to Tier 3, which makes them identical to the Sanctuaries in Assault and the old version of Siege. The Nester bosses are introduced. The bosses now spawn in groups of about 5-7 per group.
Waves 15-19
At the start of Wave 15, the Sanctuaries are upgraded to Tier 4. Bosses and enemies will spawn in slightly larger numbers.
Waves 20-24
At the start of Wave 20, the Sanctuaries are upgraded to Tier 5. The Terrestrials and Celestials are introduced.
Waves 25-29
At the start of Wave 25, the Sanctuaries are upgraded to Tier 6. The Sanctuaries will stop upgrading at this point. Bosses will keep spawning in larger numbers.
Waves 30-49
The "Final Bosses" (Kronos, Ragnarok, and Legionary Crasher) are introduced. It is likely for a special wave to appear during those waves.
Waves 50+
The bosses will continue to spawn in extremelylarge groups, so a large team of tanks is necessary to keep advancing. It is now common for all three "Final Bosses" to spawn in the same wave.
Special Waves
These waves have a small chance to appear and will replace all of the bosses with specific bosses, boss types, or enemies. Those waves, especially when appearing in later waves, can spawn tremendous amounts of entities and can even crash servers. Therefore, special waves should not be underestimated, even if the specific boss/enemy is comparably weak, as large groups of bosses are very strong and can take down Sanctuaries. Special waves can appear as soon as Wave 2, though they can never replace the first wave.
There are currently eight different types of special waves:
Crashers only - During this wave, a large amount of Crashers spawn. Those waves are relatively harmless, as Crashers can be easily defeated by almost all tanks and the Sanctuaries' traps are able to destroy Crashers.
Elite Crashers only - During this wave, only Elite Crashers (Elite Destroyer, Elite Battleship, Elite Spawner, Elite Trap Guard, Elite Sprayer, Elite Spinner, and Elite Gunner) can spawn. It is currently unknown if this is actually a special wave, as those waves spawn very early in the game (Waves 1-10), usually when other non-Elite Crasher bosses haven't been introduced yet. Sentries and Crashers can spawn along with the Elite Crashers, and Shiny Sentries have a very small chance to replace the regular Sentries.
Sentry and Sentinel only - During this wave, only Sentries and Sentinels can spawn. However, they will spawn in very high numbers and can even destroy a few Sanctuaries, especially if this wave appears later in the game. Crashers can also spawn along with them. It is currently unknown if Shiny Sentries can spawn along with the regular Sentries and Sentinels, or if the Shiny Sentries can replace the regular Sentries during this wave.
Nesters only - During this wave, only the Nester bosses (Nest Keeper, Nest Guardian, and Nest Warden) can spawn. This type of special wave is extremely dangerous, especially when appearing during the later waves, as large amounts of Nester bosses can easily annihilate both players and Sanctuaries. It is recommended to use high DPS tanks and have many players during this special wave to defeat all of the Nester bosses.
Mysticals only - During this wave, only the Mystical bosses (Sorcerer, Summoner, Enchantress, and Exorcistor) can spawn. Not only is this special wave extremely dangerous, but also can crash the server due to the absurd number of drones spawned by the Mystical bosses, especially during the later stages of the game. In order to counter this wave, many crowd control tanks (Penta Shot, Octo Tank) are needed to block the drones while a team of high DPS tanks (for example, Machine Gunner) defeat the bosses themselves.
Terrestrials and Celestials only - During this wave, only Terrestrials (Ezekiel, Ares, Gersemi, Selene, and Eris) and Celestials (Zaphkiel, Paladin, Freyja, Theia, and Nyx) can spawn. Since there cannot be two of the same Celestial or Terrestrial variants present in the arena at once, there can only be a total of 5 Celestials and 5 Terrestrials at most. Therefore, this special wave is slightly less dangerous than the other special waves; however, this does not mean that this wave should be underestimated. Usually, a large group of tanks is needed to take down all of the Terrestrials and Celestials.
Polygon only - During this wave, only Polygons may spawn. However, the number of polygons that are spawned is ridiculously high, leading to possible lagging of server. In fact, the developers has spawned this wave a few times in the past to purposely shut down the server. As polygons are passive and doesn't attack, this wave is relatively harmless, though polygons might spawn on top of each other and send themselves flying into players if they are unlucky enough. This wave can sometimes end before all of the polygons are destroyed, leading to minor inconveniences during the next wave.
Bob only - During this wave, only the Bob boss can spawn. The number of Bob bosses spawned depend on the wave, and many can spawn if this wave appears later in the game. As the Bob bosses target players instead of Sanctuaries, and will simply circle around Sanctuaries when there is no player to target, it is almost impossible to lose the game on this wave. It is recommended to have a fast tank such as the Booster distract the Bob bosses while another tank kills them. This wave was previously thought to only be able to be spawned by the developers and admins, but there has been many sightings recently, leading to the belief that this wave is a rare event in Siege that can occur anytime.

Rogue Bosses
These bosses have gone Rogue and will help the players, they are the Rogue Palisade and Rogue Armada and come in the forms of Mysterious Eggs, having different sides to differentiate between them, however there is a rare chance for a Rogue Celestial egg to be replaced with a normal Mysterious Egg, having a once removed boss fight on your side. These Rogues tend to follow the player with the most score.
Terrestrial, Celestial, and Eternals
Terrestrials, Celestials, and Eternals are unique bosses exclusive to Siege mode. They are the most powerful types of bosses and require a decently large team to defeat inside of Siege.
Legionary Crasher
Legionary Crashers are much like Elite Crashers, however they are on the same level as Eternals, being able to spawn Elite Legions, unique variations of the Elite Crashers.
Healer Branch
Siege mode is also home to a unique new tank branch: The Healer. As the name suggests, this branch of tanks heals other tanks. However, they do not deal damage to Bosses and cannot heal Sanctuaries.

Elite Crashers
The most common type of boss, consisting of weak bosses that appear in waves from the earliest to the latest. Are there to provide swarm, however some are there to camp Fallen Sanctuaries.
Elite Skimmer
The Elite Skimmer is a larger Triangle with huge Skimmer turrets on its sides. Is slow moving and slow attacking, but can deal heavy damage.
Mysticals
The Mysticals are relatively weak bosses, which are only more powerful with swarming. There are currently 4 Mysticals: The Sorcerer (Egg), The Enchantress (Triangle), The Summoner (Square), and The Exorcistor (Pentagon), with each of them spawning their respective shape to attack.
Nesters
Nesters are somewhat large, Pentagon-like bosses. There are currently 3 Nester variants: Nest Keeper, Nest Warden, and Nest Guardian. They are a medium threat to Sanctuaries, being able to camp in the center of the map or near the sanctuaries.
Terrestrials
Terrestrials are much like Celestials, only much smaller and weaker unless clumped together, having less health and slightly easier to defeat. It is advised that you still have a group of Players in order to defeat them. Only 1 unique Terrestrial can be fought at the same time, however you can still have multiple different types of Terrestrial spawn.
Celestials
Celestials were the original super-bosses in Siege. They are larger, much more powerful and have more health than the Terrestrials. They used to be spawnable in FFA, but are currently Siege-exclusive bosses. It is best if you got a group of players to take out the Celestials, being a huge threat if they're able to group together and attack the Sanctuaries. Only 1 unique Celestial can be fought at the same time, however you can still have multiple different types of Celestials spawn.
Eternals
There are currently two Eternal-type bosses: Kronos and Ragnarok. They are the strongest bosses in the game with a massive health pool and huge damage, easily able to decimate Sanctuaries and Players. These Eternals move slower than all the rest of the bosses when looking at the map, it is advised to take down the Eternals with a large number of players as it is impossible to do so alone. Only 1 unique Eternal can be fought at the same time, however you can still have both Kronos and Ragnarok spawn in the same round.
Legionary Crasher
Legionary Crashers are huge, powerful, and much more durable versions of the Elite Crashers, having a huge health pool and huge damage, able to spawn pillboxes in that can help decimate Sanctuaries. The unique part of Legionary Crashers is that they can produce Elite Legions from them to help destroy your Sanctuaries, however it is mostly bugged when they use the Elite Gunner as their targeting is different. It is impossible to defeat alone. Only 1 Legionary Crasher can spawn at the same time.

High DPS tanks, such as Machine Gunner or Factory, are necessary to out-spam the Bosses and kill them with sheer firepower. However, there are many alternatives available, including Auto-Gunner, Streamliner and Redistributor. In general, tanks that shoot a lot of bullets are favoured for their raw DPS against bosses, most notably from the Gunner branch.
Tanks from the Healer branch, such as Surgeon and Paramedic, are also needed to counter the damage received by the players from the bosses. They provide invaluable amounts of heal increase players' HP and potentially save their lives, these tanks cannot do damage, however they gain score from healing the player. Healers should target Rogues first to ensure they do not die as they also provide invaluable help to the team. Healers cannot heal Sanctuaries.
As no-healer tank try to team up with some other players. Focus your fire on a one boss(weak to strong)
Rogues provide invaluable help to the team, following the person with the most score, it is strongly advised to keep these alive as they provide cover for other players, however they are hard to control, circling the top player and attempting to ram into Bosses, dealing huge damage to them and the Boss. Healers are advised to keep healing the Rogues and top player, as well as that a group of Players should help to defend the Rogues and top player unless that top player kills the rogue intentionally.
It is also necessary to fight in groups to increase survivability, damage and protection, even when protected by a Sanctuary. In groups of 5 or more players, a Healer is also needed to heal the players and enable them to continue fighting the bosses and take out smaller targets like Elite Crashers and Mysticals, or work together to take out bigger targets like Celestials. More Healers will be needed for more tanks, especially if they are not supported by a Sanctuary.
When working together in groups, it is advised to take out the smaller and faster targets first (ranging from Crashers to Terrestials) as they are usually easier to isolate and take out. It is also important to concentrate the groups' firepower by focusing on 2-3 main targets at ones(can be anything) as this will ensure that the target goes down as quickly as possible without delaying the team too much time.
As such, players should not try to defeat Bosses on their own, or even in a large group due to their sheer firepower that can overwhelm players, unless the group is large enough or that the boss is the only target left to defeat, however it becomes a threat if these bosses are able to swarm a single Sanctuary by stacking up together so it is recommended to have players at every Sanctuary in order to survive.
If there is a single Sanctuary left a small group of players should recapture that Sanctuary in order to not lose Siege.

May 9, 2020: 'Boss Event' starts.
Original map had a randomly generated ring of maze walls with red bases at the cardinal directions, with a center spawn base.
The game mode originally had 27 Waves.
May 14, 2020: Sanctuaries were added onto the map, meaning players could now lose.
May 17, 2020: Boss event ends.
May 23, 2020: Permanently re-added Boss Event as 'Siege' due to staggering popularity.
December 9, 2020: Anti-Tank Machine Gun is added to prevent players from escaping the map.
June 4, 2021: Elite Sprayer reworked.
Added two smaller auto-Sprayer turrets on each side of its body, and two Machine Gun auto turrets at center.
June 5, 2021: Reworked Siege.
Reworked ring of walls to have a preset design stretching around the red bases.
Doubled the number of Sanctuaries.
Increased the number of Waves to 31.
Ragnarok added as a final boss.
Siege (and Ragnarok) undergoes an additional 7 minor balance updates in June.
June 27, 2021
Removed Underseer branch from Siege.
Re-added Polygons to Siege.
July 9, 2021: Removed Smasher branch from Siege. (Discussed below.)
July 13, 2021
Added very rare, green variants of Sentries with stronger weapons.
Kronos added as a final boss.
Waves with a single boss now spawn in the middle of the map in Siege.
Quick patch on the same day: Only Wave 1 and 34 spawn in the middle of the map.
Another unmentioned update: Added a pre-warning broadcast for the above 2 waves.
July 15, 2021
Shortened the time between first few waves.
Gave final bosses 3-second invulnerability upon spawning.
August 27, 2021: Added spawn animation to final bosses.
They initially spawn small, and grow in size for 3 seconds (during which they're invulnerable - see above).
September 2, 2021: Nyx, the pink Celestial, was added, first appearing in Wave 16.
This subsequently increased the number of waves from 31 to 34.
October 1, 2021: Legionary Crasher added as a final boss.
November 2, 2021: Reworked Maze wall physics, making Siege map escape much harder.
November 12, 2021: Leaving the Siege map deals direct damage to the tank.
Anti-Tank Machine Guns are still present.
November 25, 2021: Changed map generation back to the pre-June 2021 state, causing the walls to be randomized again.
A few days later, the Pentagon Nest areas were also changed.
December 9, 2021: Temporarily added 4 Healer upgrades: Medic, Ambulance, Surgeon, and Paramedic.
December 19, 2021: The Winter Mayhem event begins. (More information in main page)
January 1, 2022: Winter Mayhem event ends.
January 8, 2022: Permanently re-added the 4 Healer upgrades.
December 16, 2022: Siege Overhaul.
There are now 3 maps, being Fortress, Citadel and Blitz.
Added Nest Warden, Nest Guardian, Nest Keeper, Sorcerer, Exorcistor, Enchantress, and 5 Terrestrials as Siege-exclusive bosses.
There are now an unlimited number of waves. The waves also include the bosses added on the same day.
Added Rogue Armada and reworked Rogue Palisade to fight alongside the player from the mysterious eggs.
Removed the broadcasting of boss spawning.
Removed scripted waves that summoned a certain boss on certain waves.
Revamped Legionary Crashers AI and stats to be more balanced.
Added Sentinel.
April 6th, 2023: New world Record of Wave 100 achieved.
As a result, the Vulture tank was added to Arras.io the next day.
However, Wave 100 was not beaten, but instead the server was shut down before players had a chance to beat the wave.

May 1st, 2023: New world Record of Wave 102 achieved.
After defeating wave 102, wave 103 started with zero bosses spawned. The server was forcefully closed after the developers of Arras.io spawned a huge amount of polygons at the center of the map, causing the server to overload, resulting in a shutdown. The server restarted with the same map but the waves were reset to 1. Players' scores were retained.
May 26th, 2023: New world Record of Wave 115 achieved.
After defeating wave 100, a developer, presumably Valrayvn, who was previously on the server, restarted the server in an attempt to curb lag issues. Scores were retained and the 3 Rogue bosses were reinstated without issues. However, after the reset, the wave was not 101, but rather 103. Furthermore, since Wave 114 was reached and players advanced another 12 waves, the record would've still been beaten if the number of waves began at 101. Apparently, a dev offered to add 6 tanks if wave 111 was reached.
June 11th, 2023: New world record of Wave 154 achieved.
July 3rd, 2023: The developer hosts a game of Growth Siege as an event. The developer then turns it into Growth Manhunt Siege, so that the players can get 100% of the bosses' score upon their death. However, all tanks were still on the same team. This event ended when the developer enlarged all players to ridiculously large sizes, then closed the arena.
September 15th, 2023: arras.io but among us
September 19th, 2023: New world record of Wave 200 reached. The dev, Damocles, turned on override for all the bosses, including the rogues, until Wave 162, in which the server reset to "fix some bugs".
September 20th, 2023: WAVE 200 HAS BEEN REACHED. PREPARE FOR TRAVELING TANKS EVERYONE. THEY WILL BE ADDED SOONLY.
Used to say: "IN ORDER TO HAVE THIS BE ADDED, WE MUST GET A SEIGE SERVER TO WAVE 200, OR ELSE NO NEW TANKS."

For a period of time, Siege was thought to only have 100 waves, as the developer once joked about a final boss on Wave 100. However, when the first Siege World Record was reached, this was proven false.
Siege is the only gamemode to have Healer and its branch.
Furthermore, it is the only gamemode to not have Smasher as a branch. It was permanently removed to avoid players using the Spike and its bounce ability to jump outside the map.
The developers temporarily removed Octo Tank and Cyclone a few times due to players using the aforementioned tanks and grouping together in large numbers, causing the server to lag.
Arms Race can be combined with Siege, and its exclusive tanks can be played. The waves and bosses remain the same.

The collection of images relating to Siege can be found at Siege/Gallery.
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