recursal/Fanatic-Fandom huggingface dataset:
D1

**D1** is an unlockable activated item added in *The Binding of Isaac: Afterbirth †*.

## Effect

* Duplicates 1 random pickup in the current room, including Cards, Runes, Chests, and trinkets.
* Duplicated pickups may not be identical to the original; for example, a duplicated card may be a different one than the original.

## Notes

* It is possible to duplicate Shop pickups that have not been purchased yet.
* With , it is possible to infinitely generate Lil' Batteries from a single Lil' Battery.
	+ While it's still possible to generate infinite batteries with this synergy, it is slow to do so since mostly Micro Batteries will spawn. The occasional Lil' Battery or other battery spawn is needed to build up the battery pile.
* can not be duplicated.
* Mimic Chests will not be duplicated until their spikes are exposed.
* Opened chests will be duplicated into an unopened copy.
* A normal Chest may be duplicated into a Red Chest or a Mimic Chest.
* A duplicated trinket is mostly useless, as you cannot pick up two of the same trinket even with , , or .
	+ However, with "consumable" trinkets such as  or , it can be extremely powerful.
* In combination with a 48 Hour Energy pill and , the initial Locked Chests on Chest can be infinitely duplicated and opened.
* In Greed Mode, if a Lil' Battery appears in the Shop and a  is acquired, infinite money can be gained by duplicating the Two of Diamonds.
* By dropping a card, rune, or pill in a room with no other pickups, then using D1, this item can function similarly to  and .
	+ By dropping a card, pill, or trinket in a room with no other pickups, then using D1, this item can function similarly to , , or  (But without the luck up or doubled trinket effects).
* A duplicated card has a very rare chance to turn into a , , or ; however, these will always duplicate as themselves instead of duplicating as a card.
* A duplicated Gold Pill will turn into a random Pill chosen from the Pill Pool.
* When duplicating any type of Chest, the contents of the original Chest will be rerolled. This can be seen with Guppy's Eye.

## Synergies

* : Spawns a white six-sided die wisp on the middle ring. An extra wisp spawns if no pickups are duplicated.
* Tainted Lost: Duplicated cards have an increased chance to be Holy Cards.

## Trivia

* D1 is the only die item that doesn't re-roll anything.
	+ The D1 now creates randomized pickups, meaning that the description is more accurate to the item's effect.
	+ As an exception,  and , although they technically do re-roll items/enemies, have a controlled and consistent result.
* D1 is the only standard die item that doesn't have the respective number of sides as outcomes, but rather, just a D6 with all sides having singular pips. Rather, an actual D1 would be more accurately pictured as a Mobius strip or a sphere.
Celtic Cross

**Celtic Cross** is an unlockable passive item.

## Effect

* Grants a chance to trigger the  effect upon taking damage, creating a shield that nullifies all types of damage for 7 seconds.

## Notes

* The base chance of creating the protective shield is 20%
* The activation chance of this item depends on the Luck stat and goes up to 100% at 27 Luck.
* The shield negates health loss from Blood Donation Machines and Devil Beggars.
* Does not prevent Heart Container loss from Health Down pills or Devil Room Deals.
* Does not prevent damage from .

## Synergies

* , : Can trigger at the same time as The Polaroid or Virgo, cumulating to up to 22 seconds of shield.

## Trivia

* In Galicia, Celtic crosses are usually found on top of granaries as a protective measure against any kind of evil. They are also commonly found among Celtic nations today and historically.
* This item is functionally almost identical to , minus the pill conversion effect.
Devil's Crown

His special customer

**Devil's Crown** is a trinket.

## Effects

* Treasure Rooms are replaced with unique Red Treasure Rooms, offering a Deal with the Devil in place of an item.

## Notes

* It is possible to transform Treasure Rooms between normal ones and red ones by picking up and dropping Devil's Crown, as long as the Treasure Rooms have not yet been entered.
* Credit card does not affect the items found in the treasure room.
* This trinket does not affect Treasure Rooms found in the alternate area of the Mausoleum.
	+ Dropping the trinket and picking it up again makes it work with extra Treasure Rooms (found in the alternate area of the Mausoleum or generated by Red Key).
Corpse

*(chapter 4.5)*

The **Corpse** is a new floor added in The Binding of Isaac: Repentance, which acts as the Womb's alternative Chapter. It features a desolate and dreary atmosphere with enemies that carry the theme of death and advanced rot. The Corpse is one of five final levels in The Binding of Isaac, alongside the Chest, the Dark Room, The Void, and Home.

To access The Corpse, the player must first open the flesh door at the end of the Mausoleum/Gehenna II after defeating the Mausoleum version of Mom by doing one of the following:

* Collect  and , which are obtained via puzzles inside Downpour and the Mines, to build the knife familiar, and stab the door with it.
* Sacrifice one key and open the door by using .
* can also open the door while simultaneously letting you keep the knife familiar.
* Using a .
* If Isaac exits the Boss Rush room in Gehenna after 25 minutes have passed, there is a chance that the flesh door will change positions to the wall where the boss rush door was, causing Isaac to "come out" of the flesh door and leaving it open, allowing entry without the knife.

(Note: The item  can not be used to open the Flesh Door.)

On the other side of the flesh door, the player will fight the Mausoleum version of Mom's Heart, after which the entrance to the Womb will turn into the Corpse entrance, which will take the player into the Corpse floor.

The boss of Corpse II is always Mother.

The  cannot open doors to the I AM ERROR room in Corpse II.

 and  cannot generate trapdoors in Corpse II.
An I AM ERROR room can only be visited in Corpse II via clipping out of a Crawl Space; such I AM ERROR room will contain a passageway which leads back to the starting room of the floor.

If the game is exited after defeating Mother and rejoined, there will be a door in the room allowing the player to leave the room. This can be used to go to a Sacrifice Room and then warp to the Dark Room, letting the run continue further.

## Trivia

* The Corpse is the only Alternative Chapter to not have any alternative floors.
	+ An unused floor named Mortis, presumably as an alternative to the Corpse, exists in the game files.
* In *Antibirth*, the hole to the Mother battle had 4 Golden Chests next to it that always contained items, similar to chests in The Chest.
* If a room's floor is filled with blood, there will be a huge blood stain on the floor upon entering any room adjacent to it.

## Bug

* still has a small chance to generate trapdoors in Corpse II. These trapdoors will lead Isaac to ???.

## Music

* The music for Corpse is titled *Carrion*.
	+ The term "carrion" refers to the decaying flesh of dead animals.
Credit Card

"Charge it!"

The **Credit Card** is a special card.

## Effects

* Using the Credit Card in a Shop instantly removes the cost of all items in that shop, allowing Isaac to take all of them for free.
* Using the Credit Card in a Devil Room or Black Market allows Isaac to take all the items without any health cost.
	+ Taking Devil Room items with the Credit Card does not prevent Angel Rooms from appearing.

## Notes

* Free items will remain free, even if Isaac leaves the current room.
* Works with the , allowing Isaac to purchase all items from every Shop, if used correctly.
* Using the Credit Card in a Shop prevents  from working in this Shop only. However, Restock Machines will work, creating new items.
* Can be used in the starting room of Dark Room, allowing all four items to be taken for free.

## Trivia

* Credit Card is given significantly more detail in its Four Souls card, showing it to be owned by Isaac's Mom.
	+ The Credit Card itself is from "Heavenly Rewards", with a symbol resembling an upside-down  in the bottom right corner.
	+ The last four digits on the Credit Card are "0109", a reference to a bug involving the Greed Donation Machine that was later incorporated in an ARG that added  Keeper to the game.
Compost

**Compost** is an activated item added in *The Binding of Isaac: Afterbirth †*.

## Effects

* Upon use, converts pickups within the current room to Blue Flies or Blue Spiders.
* Doubles Isaac's current amount of Blue Flies and Spiders.
	+ If Isaac has no Blue Flies or Spiders, spawns one Blue Fly or Spider.

## Notes

* The item will cost 10 cents if found in a Shop
* Does not work on Troll Bombs or Mega Troll Bombs.
* One character using it does not seem to double the spiders/flies for other characters. It only seems to double the ones following the character using the item.

## Synergies

* : Spawns a wisp in the middle ring if Compost destroys at least one pickup, and the wisp's health will be equal to the number of pickups converted to Blue Flies/Spiders. If Isaac hits the blue fly cap of 64 as a result of using Compost, all but one of Isaac's wisps will despawn.
* : Spawns 2 Blue Flies or Blue Spiders for each pickup removed, quadruples the current amount and spawns two if there is none.
* : Isaac will gain twice as many flies per use, meaning each fly will be tripled.

## Trivia

* Compost is organic matter that has been decomposed and recycled as fertilizer.
Carrion Queen

Degraded Boss
Main path

Alternate path

**Carrion Queen** is a boss that can appear in the Catacombs.

## Behavior

### Phase 1

Carrion Queen is only vulnerable in the flesh segment of her behind. She moves randomly around the room in cardinal directions and can perform the following attacks:

* Carrion Queen charges at Isaac whenever he lines up with one of her cardinal directions.
	+ Like Chub, Carrion Queen eats any Bombs dropped in her path; stunning her for a moment before dealing considerable damage.
* Spawns a damaging Red Poop up to a maximum of 5.
	+ She damages and destroys Red Poop she charges into.

### Phase 2

* When below half health, Carrion Queen begins to move diagonally, similar to The Hollow, but without flight. She no longer performs her previous attacks from **Phase 1**.
	+ She will bounce off of obstacles and her own Red Poop damaging it and destroying it in the process.

Carrion Queen deals a whole heart of contact damage in both phases.

## Champion Versions

**Pink**: Carrion Queen moves slightly quicker, has 100% more HP (700) and spawns small Hearts instead of Red Poop. The hearts have 28 HP and killing them deals 40 damage to Carrion Queen. She does not bounce diagonally around the room when below half health.
## Gallery

* Carrion Queen in-game.
* Pink Champion Carrion Queen.
* Carrion Queen as one of Delirium's forms.

## Notes

* Piercing tears make the fight much easier, as tears can pass through Carrion Queen's invulnerable segments and hit her vulnerable segment.

## Trivia

* Carrion Queen was added in the *Wrath of the Lamb* DLC for the original *The Binding of Isaac*.
* She is the posthumous version of Chub.
* She is the boss version of the Carrion Princesses.
* Carrion is another word for the rotting flesh of a dead animal, often eaten by scavengers like vultures, coyotes, maggots, etc.
* The name "Carrion Queen" could be inspired by a level of Super Meat Boy under the name "King Carrion".
* Despite the Carrion Queen being an invertebrate, or an animal lacking a skeleton of bones, she has a skeletal appearance.
* During the death animation, Carrion Queen's head doesn't burst into blood. Instead, it flattens and instantly disappears.
* In the Bestiary, she is referred to as "The Carrion Queen".
Butt Penny

**Butt Penny** is a trinket.

## Effects

* Upon picking up a coin, Isaac farts, knocking back nearby enemies  and projectiles.
	+ The fart does not deal any damage or inflict poison.
		- The fart inflicts poison.
* 20% chance for a coin to drop from Poops, in addition to its normal drop chances.

## Notes

* It can be found by destroying Special Shopkeepers.

## Synergies

* : Grants a chance to spawn a Dip each time a coin is picked up.
* /: Grants poops made from enemies a chance to drop pickups.
* : The size of the fart is drastically increased.
* /  Tainted ???: Thrown poops gain the chance of dropping a coin on being destroyed.
* /  / : Pennies dropped can be used either defensively to deflect enemies and projectiles, or offensively to poison.
* / : Allows Isaac to slowly farm coins over time.
* /  : Isaac farts flames whenever he picks up coins.

## Interactions

* / : Poops made from enemies do not drop pickups.
* Tainted Keeper: All coins dropped from enemies trigger the effect, helping in defending Keeper or damaging nearby enemies, though the knockback could make collecting coins more difficult were there a lot of them dropped close to each other.
Buttlicker

### Found In

**Buttlickers** are monsters that wander around randomly in straight lines similar to Larry Jr..
They most often spawn attached to other Buttlickers in chains of up to 5. When one Buttlicker in the chain is destroyed, the other Buttlickers separate from each other and continue to move in random directions.

Similar to Larry Jr., Buttlickers can destroy Poop on contact.

## Variants

### Stage HP

 16
 3

### Found In

**Butt Slickers** when encountered individually, act identically to Buttlickers, but unlike their counterparts they can group together and stick to other Butt Slickers. When grouped together they begin to drag themselves towards Isaac. Upon killing a Butt Slicker within a group, it creates a pool of slowing Black Creep and shoots out black projectiles; the amount of projectiles released and the size of the pool of Black Creep is determined by the amount of Butt Slickers attached. All other Butt Slickers will scatter and temporarily leave trails of Black Creep when this occurs.

Killing a Butt Slicker in a group of 2 or 3 will create a small pool of Black Creep and 4 projectiles in the cardinal directions while killing one in a group of 4 or more creates a large pool of Black Creep and 8 projectiles in the cardinal and diagonal directions.

## Gallery

* Concept art for the Butt Slicker and Sticky Leaper.

## Notes

* Any status effect inflicted on a Buttlicker (poison, etc) will also spread to any other Buttlickers attached to it if in a chain.
* Charming a chain of Buttlickers will cause it to chase Isaac if no other enemies are in the room. However, if Isaac kills a Buttlicker in the middle of the chain and then charms them, the Buttlickers will attack each other.

## Trivia

* Buttlickers were first implemented in the *Wrath of the Lamb* DLC for the original *The Binding of Isaac*.
* In the original *The Binding of Isaac*, destroying any Buttlicker in a chain would cause all Buttlickers to separate and move independently. This does not happen in Rebirth.
* This is possibly a reference to the movie "Human Centipede".
Crystal Key

**Crystal Key** is an unlockable trinket added in *The Binding of Isaac: Repentance*.

## Effects

* Whenever Isaac clears a room, has a chance to open a neighboring Red Room.
	+ This effect can occur while Isaac is inside a Red Room, but the chance is smaller.

## Notes

* It's possible to increase the chance of a Red Room unlocking if multiple Crystal Keys are held, e.g. from absorbing using , holding , having a golden Crystal Key, or other methods. The chance for a Red Room door to unlock depends on the number of Crystal Keys held and if the room cleared is normal or Red.

 2
 3
 4
 5

* Each cleared wave of a Challenge Room has a chance to generate an adjacent Red Room.
* Rooms that are re-fought using the  have a chance to generate additional Red Rooms.
* Doors do not have to open to an actual valid Red Room, and can lead outside the map and into an I AM ERROR Room.
C.H.A.D.

Degraded Boss

**C.H.A.D.** is a boss that can appear in the Caves and the Flooded Caves.

## Behavior

C.H.A.D. moves randomly around the room in cardinal directions and can perform the following attacks:

* C.H.A.D. charges at Isaac whenever he lines up with one of his cardinal directions.
	+ Like Chub, C.H.A.D. eats any Bombs dropped in his path; stunning him for a moment before dealing considerable damage.
* Spawns 1-2 Suckers.
* As he gets damaged, C.H.A.D. gradually shrinks in size and increases in speed and attack frequency.

## Gallery

* C.H.A.D ingame.
* C.H.A.D as one of Delirium's forms.

## Notes

* C.H.A.D is much less common than his counterpart, spawning only 1/4th as often.
* C.H.A.D can spawn alongside 2 Boils or 2 Red Boom Flies.
* Each segment of C.H.A.D. can be individually damaged, so a single piercing tear could hit C.H.A.D. multiple times.
	+ Piercing shots no longer damage segmented enemies multiple times per attack.

## Trivia

* C.H.A.D. appeared in the original *The Binding of Isaac*.
* He is a rare alternative to Chub.
* C.H.A.D. is a cameo from Super Meat Boy, a game by Edmund McMillen.
	+ In Super Meat Boy, he is the boss of Chapter 2: The Hospital.
	+ When defeated in Super Meat Boy, C.H.A.D. would shrink to a smaller version of himself. Him Getting smaller during the fight in *Rebirth* and the item  are allusions to this.
* The name C.H.A.D. is a reference to the 1984 horror film *C.H.U.D.*, confirmed by Edmund.
* Despite C.H.A.D. normally being speculated to stand for "Cute, Huge and Deadly," Edmund McMillen had confirmed that it doesn't stand for that phrase.
	+ When asked what it does stand for, Edmund jokingly replied that he can't legally say.
* C.H.A.D.'s secret for unlocking him says "In the Depths" even though he is found in The Caves.

PS4
Vita Even though C.H.A.D is unlocked by accomplishing "Something Cute", its PSN Trophy icon features Chub.
Cube of Meat

**Cube of Meat** is an unlockable passive item.

## Effects

* Spawns an Orbital Familiar around Isaac which blocks shots and deals contact damage.
	+ It deals 105 damage per second.
	+ It deals 52.5 damage per second.
* Each subsequent Cube of Meat obtained are combined with the first one (increasing its 'level'), changing its characteristics:
	+ Level 2: Gives the orbital the ability to shoot tears that deal 3.5 damage.
		- It shoots once every second.
		- It shoots once every 0.73 seconds.
	+ Level 3: Changes it from an orbital to a Meat Boy that chases nearby enemies dealing contact damage.
		- It deals 8.75 contact damage per second.
		- It deals 12.5 contact damage per second.
	+ Level 4: Increases the size of the Meat Boy larger and increases its damage.
		- It deals 13.75 contact damage per second.
		- It deals 25 contact damage per second.
	+ The fifth Cube of Meat will create a new Level 1 cube, and start the cycle again.

## Notes

* Multiple Cubes of Meat can be collected in a single run.
* The orbital orbits Isaac significantly faster.
* Famine, Pestilence, War, and Death will always drop either a  or Cube of Meat. After the first one drops, further Harbingers will only drop that same one and never the other for the duration of the run.
* The ticking rate for Meat Boys' contact damage causes them to often deal damage twice once they touch an enemy, making their first second of DPS up to 1.5x higher than normal.

## Synergies

* : Ensures that Harbingers that haven't already been defeated will replace their respective floor's boss, making it drastically easier to collect multiple Cubes of Meat.
* / : Additional copies of Cube of Meat combine with the first, increasing its level as normal.
* : Consumes 1 Heart Container in return for creating 1 Cube of Meat and increasing damage a little.

## Interactions

* : Familiar will stay in place relative to Isaac at levels 1 and 2. No effect at levels 3 and 4.
* Pretty Fly: Cube of Meat will replace one if Isaac already has 3 Pretty Flies. If the Cube of Meat reaches level 3 or 4, the Pretty Fly will come back until another Cube of Meat orbital is obtained.

## Unlockable Achievements

* **Super Meat Boy** - Make a Super Meat Boy by picking up 4 copies of  in one run; see Unlocking Super Meat Boy & Super Bandage Girl.

## Gallery

* Level 1 Cube of Meat.
* Level 2 Cube of Meat.
* Level 3 Cube of Meat.
* Level 4 Cube of Meat.

## Trivia

* The Cube of Meat is a reference to the game *Super Meat Boy*, developed by Edmund McMillen, creator of *The Binding of Isaac*.
* The pickup quote is a reference to the *Pokémon* series catchphrase "Gotta catch 'em all."
* Cube of Meat is found in 9 item pools, the highest count amongst all items, due to the fact that it appears in all of Greed Mode's item pools.
Capricorn

### Collection Grid

*(page 4, column 2, row 1)**(page 3, column 2, row 4)**(page 3, column 3, row 4)*

**Capricorn** is a passive item.

## Effects

* Adds 1 Red Heart Container.
* +0.5 Damage.
* +0.1 Speed.
* +1.5 Range.
* +0.75 Range.
* -1 Tear Delay.
* +0.5 Fire Rate.
* +1 Bomb, Penny, and Key.

## Trivia

* Despite the pickup quote being "All stats up", Shot Speed and Luck aren't raised in any way.
Curse of the Tower

### Collection Grid

*(page 4, column 6, row 1)**(page 4, column 6, row 1)**(page 4, column 7, row 1)*

**Curse of the Tower** is a passive item added in *The Binding of Isaac: Afterbirth*.

## Effect

* Upon taking damage, spawns six Troll Bombs around the room, similar to the effect of .

## Notes

* Despite appearing as Troll Bombs, the bombs are mechanically identical to player-placed bombs and will benefit from Isaac's bomb-enhancing items.
* These bombs hurt the player as well as enemies.
* Taking damage from the Troll Bombs spawned by Curse of the Tower or any other type of bomb, including Isaac's bombs, will not re-activate the effect.
* Picking up this item will make all health transactions more difficult. Devil Beggars and Blood Donation Machines will be almost impossible to use because they will very likely be destroyed by bombs.
	+ Taking damage from Devil Beggars and Blood Donation Machines does not trigger the effect.
* The bombs prefer to spawn near the center of the room.
* The 6 Troll Bombs are difficult to dodge in small rooms.

## Synergies

* : Each troll bomb has a chance to spawn a pickup or a trinket including hearts for repeated use.
* : If Isaac is damaged when he has half a Red Heart or less, the shield will activate and protect him from the Troll Bombs.
* : Troll Bombs will heal Isaac instead, allowing for essentially infinite health with proper usage.
	+ Due to Pyromaniac being weakened to healing half a heart per explosion in *Repentance*, this synergy requires  to continue being effective past Chapter 3/Chapter 3.5.
* : The Troll Bombs generated will not explode until Remote Detonator is activated, unlike regular Troll Bombs.
* : The Troll Bombs generated will be converted into bomb pickups rather than exploding.

## Interactions

* : Not recommended. Spawns 6 Troll Bombs for each Half Red Heart removed, making death highly likely if Isaac does not leave the room immediately after being stabbed by Blood Oath, and leaving the starting room unsafe.
* : Not recommended. Spawns 6 Troll Bombs for each Half Red Heart removed, making extra damage highly likely if Isaac does not leave the room immediately after using Sharp Plug.
* : Not recommended. The cross pattern explosion makes it very hard to avoid taking damage.
* : No effect.
* : Not recommended. Each Troll Bomb will spawn several smaller bombs upon exploding, making it very hard to avoid taking damage.
	+ No visual change can be seen with the Troll Bombs, but the smaller bombs have the sprite of the smaller normal bombs.

## Trivia

* The item image appears to be an  card that has been burnt.
* The item's pickup quote was "You feel cursed...".
Daddy Longlegs

This article is about the item. For the boss, see Daddy Long Legs.
**Daddy Longlegs** is a passive item.

## Effects

* Daddy Long Legs' shadow follows Isaac and stomps on enemies for 20 damage per tick, with each stomp capable of hitting a single enemy twice for a total of 40 damage. The delay between stomps is approximately 4 seconds.
* In a room with multiple enemies, Daddy Long Legs will prioritize on monsters with the most health first.
	+ If all monsters are of the same type, the familiar will attack the closest enemy.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a humanoid spider.

## Notes

* The foot stays down for about 1 second, and enemies who wander into it will also take damage.
* This item deals enough damage to kill most early enemies in one hit and is especially powerful against enemies with multiple segments like Larry Jr.

## Synergies

* / : Increases the foot's size and doubles its damage. Both items cannot be stacked for an even stronger effect.
* : Spawns an additional foot for the rest of the room.
* : Bolts of electricity will arc between the shadow or the foot and Isaac and his familiars.
* : Allows Isaac to stay invincible while Daddy Longlegs clears the room, granting Isaac a slow but effective way of completely avoiding damage. This combination is especially useful as  The Lost and  Tainted Lost.
* : Boosts the foot's damage while spinning.
* : Has a chance to spawn an additional foot when entering a new room.

## Interactions

* : No effect.
* : No effect.
* : Daddy Longlegs cannot be sacrificed.

## Trivia

In the original game, this item was unlocked by completing Purist (challenge #20).
Custom Challenges

**Custom Challenges** are player-made challenges that can be accessed by pressing TAB in the in-game Challenges menu.

These challenges can be defined in a `challenges.xml` file placed in a mod's `content` folder. An example of such a folder is `%USERNAME%/Documents/My Games/Binding of Isaac repentance/mods/Your Mod/content`.

## General Format

* The `challenges.xml` file uses `<challenge>` elements placed in a root `<challenges>` element.
* Here's a general template that can be used in order to create custom challenges:

```
<challenges version="1">
    <challenge name="My Custom Challenge" />
</challenges>

```

* Multiple `<challenge>` elements can be added, each one a new line.
* Each challenge is defined by using a set of attributes between the `<challenge>` tags that control the game's mechanics, such as starting items, trinkets, cards, pills, end stage, amount of heart containers, curses, rooms that will be spawned, etc.

## Attributes

* This is the full set of attributes that can be used to define the custom challenge rules.

### Characters (`playertype`)

A list of character IDs, for use with the `playertype` attribute.

### End Stage (`endstage`)

A list of stage IDs, which correspond to various chapters, for use with the `endstage` attribute.

This attribute sets the final stage of the challenge. This is where the trophy will spawn, after the floor boss is defeated. The trophy will also spawn on any next floor in case the player manages to continue.

* Setting the end stage to Chapter 9 (???) will prevent the trapdoor and light beam from spawning after defeating It Lives, but unless the player has a Strange key or the timer is under 30 minutes, the door to the Hush floor will not open, softlocking the run.
	+ Additionally, after defeating Hush, the portal to the void will not open.

### Room Filters (`roomfilter`)

A list of room IDs, for use with the `roomfilter` attribute.

This attribute sets a list of rooms IDs, separated by commas, which should not be generated.

For example, to disable both Treasure Rooms and Shops, use `roomfilter="2,4"`

### Curses (`cursefilter` & `getcurse`)

A list of curse bitmasks, for use with the `cursefilter` and `getcurse` attributes.

Unlike other attributes which accept a comma-separated list, the two curse attributes accept a **single number**, which is the combined total of all applicable curses.

For example, to apply Curse of the Labyrinth (`2`) and Curse of the Maze (`32`), the attribute value would be `34` (which is 32 + 2).

 Curse of the Labyrinth
 Curse of the Lost
 Curse of the Unknown
 Curse of the Cursed
 Curse of the Maze
 Curse of the Blind
  Curse of the Giant
D10

### Collection Grid

*(page 3, column 10, row 8)**(page 3, column 20, row 2)**(page 3, column 1, row 3)*

**D10** is an activated item.

## Effects

* Upon use, re-rolls all monsters in the room.
* Upon use, replaces all monsters in the room with weaker monsters. Each monster type has a specific weaker monster it will transform into. If the monster is already at it's weakest level, it usually transforms it into a background critter or kills it outright.
	+ Some enemies can be transformed into obstacles or pickups instead.

## Notes

* Re-rolling a monster will replace it with an entirely new one from any floor, making it dangerous to use early on in the game (as Isaac could get monsters from Depths or later).
* The D10 will not reroll Bosses but can reroll monsters spawned by bosses.
* The D10 will not reroll permanently charmed enemies.
* Using this item can cause some rooms to become impossible to clear. Jumping or flying monsters may become trapped behind rocks after being rerolled, and therefore become unbeatable.
	+ Sealed doors open after 2 minutes, though there are situations that can prevent this failsafe from triggering.
* Flying monsters will only be rerolled into other flying monsters, and ground monsters can only be rerolled into ground monsters. ( Horfs are classified as ground monsters by the D10).
* Some invincible enemies will be rerolled, while others (including most Grimace variants) are completely unaffected.
* Using this item in a room with Mom's Hand can be very dangerous, as unless they have already landed, they will be directly on top of Isaac, resulting in the new monsters spawning directly on top of Isaac, instantly dealing contact damage.
* Using this item, then exiting the room, such as by teleporting or a bombed door, will cause the enemies to be in their original forms upon Isaac's return.

## Synergies

* : Spawns orange wisps in the middle ring. Tears shot from these wisps have a 10% chance to replace enemies with their weaker variants.
* : Weakens affected enemies twice.

## Interactions

* : Using D10 while holding this will first teleport Isaac, and then reroll the enemies in the new room.

## Gallery

* 3DS The icon of the D10 as seen on the lower 3DS screen.
* Splash image which appears when D10 is activated.

## Trivia

* Despite being a dice item, D10 is not an unlock.
	+ This trait is shared with  and .
* D10 was voted the worst quality 0 item in the game in a poll on the Binding of Isaac subreddit, resulting in its consequent rework and upgrade to quality 1.
Bosses

**Bosses** are very strong monsters found in Boss Rooms at the end of a floor. The boss at the end of the floor must be defeated to advance to the next floor. From Chapter 2 onwards, many of these non-final bosses can spawn as degraded bosses, or normal enemies. The same can go for mini-bosses, which can spawn on later floors as degraded mini-bosses. However, some bosses and mini-bosses may not appear as degraded bosses at all. The boss for a particular floor is chosen from the pool of bosses for the chapters of the floor. After defeating Satan for the first time, bosses may also spawn as champions, which can change various attributes such as health, damage, and attack pattern. Upon defeat, most bosses will drop an item from the Boss item pool as well as 1-2 Hearts of any kind.

Bosses boast additional resistances to status effects. Once a boss has been inflicted with a status, they become immune to further ones for some time, lasting longer than the initial effect itself. Slowdown-causing items that require the enemy to stay within their area such as  are nearly useless on bosses due to the immunity triggering from the first tick. On the other hand, whole-room slowdown and slowing creep, such as that from  and , ignore the immunity and affect bosses like normal enemies.

Additionally, some floors may spawn a room with a mini-boss.

In total, there are 102 bosses and 20 mini-bosses. 10 bosses were added in *The Binding of Isaac: Afterbirth*, 6 were added in *The Binding of Isaac: Afterbirth †*, and 30 bosses and 2 mini-bosses were added in *The Binding of Isaac: Repentance*.

## Gallery

* Concept art for a few bosses.
* Mini-boss concept art.

## Trivia

* Originally, every boss and enemy in Binding of Isaac was going to resemble Isaac in some way.  This is still the case for some.
* Double Trouble boss pools can have bosses from previous chapters and can be the same for both versions of that chapter's floor. This means that, for example, Double Trouble boss fights in The Caves can feature bosses from The Cellar or The Basement, and every Double Trouble fight in The Caves can also be encountered in The Catacombs.
* Bosses often come in three versions: normal (for example, Monstro), posthumous ( Monstro II), and alternate ( Gish). Usually, the posthumous boss looks like the original with some horrible mutilation; for example, Monstro and Chub had most of their skin ripped off.
	+ Most bosses and their alternate/posthumous forms either share similar death animations or share the fact that they lack death animations.
* Some bosses appear as evolved or larger versions of enemies (for example, Chub looks like a bigger Charger). Some even act as larger versions of other bosses ( Little Horn and  Big Horn).

1. ↑ Edmund McMillen on Tumblr
Cultist

At the start of the room, they create a homing, indestructible Purple Ball (like Rag Mega's) and proceed to follow it around on a brief delay. These purple balls fade into Dark Balls after 6 seconds, which can be destroyed as normal and have 10 HP. They cannot spawn another ball as long as the one they previously spawned is still intact.

If they detect an enemy has died in the current room, it will stop following the ball it summoned, move to where the enemy died, and resurrect it with full health before going back to following its ball.

They can revive up to 5 enemies at a time and cannot revive other Cultists. They can, however, revive most bosses and mini-bosses.

## Variations

### Stage HP

 24
 3

### Found In

**Blood Cultists** are a variant of Cultists, but are similar only in appearance and their mobility. They wander erratically around the room and, if Isaac aligns with them horizontally, they will fire a horizontal wave of red creep and blood shots with unlimited range. They can also summon four bone traps that prevent Isaac from moving for one second when stepped on, predicting where he will be when summoning them. The bone traps cannot be destroyed in any ways other than stepping on them, and de-spawn after 3 seconds if not stepped on.

## Trivia

* Cultist might be a reference to the Floater enemy from *The Legend of Bumbo*, despite there actually being a Cultist enemy in the game.
* Cultists may have replaced the Necromancer enemy from Antibirth, as they both have near identical mechanics and reside in Mausoleum.
Candy Heart

**Candy Heart** is an unlockable passive item added in *The Binding of Isaac: Repentance*.

## Effects

* Gives Isaac one of the following stat boosts per half heart healed with Red Heart pickups or when gaining an extra filled heart container:
	+ +0.02 speed.
	+ +0.05 tears.
	+ +0.10 flat damage.
	+ +0.25 range.
	+ +0.02 shot speed.
	+ +0.10 luck.
* Spawns a Red Heart when picked up.

## Notes

* Items/effects that directly heal Isaac (such as , , , etc.) do not trigger stat boosts from Candy Heart.
* Healing using Rotten Hearts triggers the stat boosts for Candy Heart.
* This item does not give stats when adding to  Tainted Bethany's blood charges.
* This item is useless for characters that can't have red hearts (e.g.  The Lost,  Keeper,  ???, etc.).
* Any healing prior to picking up Candy Heart will not provide stat boosts.
* The stat bonuses are "stored" on the Candy Heart. Dropping or losing it in any way won't immediately revert the bonuses gained, only when Isaac's stats are updated again. The respective stat changed is the one that loses the Candy Heart bonuses.
	+ The bonus stats will be lost if Isaac's stats are updated by dropping out of the game or if the game crashes.
* The stat bonuses are seeded, meaning the same stat ups will apply in the same order in the same seed.
* Strategy Suggestion: Leaving Soul Hearts on the ground during a level allows the player to force Red Heart damage and still offer Devil/Angel Deal protection for the next floor.

## Synergies

* :/ Tainted Magdalene: Can provide infinite stat boosts, if the dropped hearts are caught in time.
* : Increases the stat boosts given by Candy Heart, provided extra Red health was restored.

## Interactions

* : This doesn't give the stat increases when picking up hearts to make spiders.
* : This item isn't affected by stacking.

## Trivia

* This item is the red heart equivalent to , and gives half as many stats per heart collected, comparatively.
Cellar

*(chapter 1)*

### Unlock Method

 Beat all Basement bosses ( except Baby Plum) (not restricted to beating bosses *in* The Basement)

**The Cellar** is one of the environments in Chapter 1. It is unlocked after defeating each boss in the Basement, including defeating the smallest twin first in Gemini's fight. It is not necessary to defeat Steven to unlock the Cellar. The theme of the Cellar is spiders and poop.

The Cellar's alternate floors are the Basement and the Burning Basement.

 After  A Secret Exit is unlocked, a locked door similar to the one leading to a Treasure Room will appear in this floor's Boss Room upon defeating the boss leading to Downpour / Dross. Like a Treasure Room, this door requires a key to be unlocked. Unlike Angel Rooms and Devil Rooms, this door never disappears.

## Notes

* Unlocking the Cellar requires defeating every boss in the Basement. However, this does not require fighting them in the Basement. It is possible, for instance, to have defeated every single boss except for the Gurglings, encounter them in the Womb, clear the room in which they are encountered, and successfully unlock the Cellar.

## Trivia

In the original Binding of Isaac, Gurdy Jr. could appear as a boss.

## Unlockable Achievements

* Something From The Future - Beat Basement 40 times.

* Sprinkler - Beat Chapter 1 without taking damage.

* Basement Boy - Beat Chapter 1 without taking damage.

## Music

* The music for the cellar is titled *Periculum*.
	+ Periculum is Latin for "danger" or "risk", signifying how the Cellar is a step-up from the Basement.
Bursting Sack

### Collection Grid

*(page 4, column 12, row 1)**(page 4, column 12, row 1)**(page 4, column 13, row 1)*

**Bursting Sack** is a passive item added in *The Binding of Isaac: Afterbirth*.

## Effect

* Certain spider enemies no longer target or deal contact damage to Isaac, nor actively spawn other enemies. Spiders that are spawned from enemies that are not affected by Bursting Sack will also remain neutral.
	+ Affected spider enemies that deal no damage to Isaac whatsoever include: Baby Long Legs, Big Spider, Crazy Long Legs, Level 2 Spider, Small Baby Long Legs, Small Crazy Long Legs and Spider.
		- Also: Rock Spider, Strider, Swarm Spider, Tinted Rock Spider and Trite.
			* Swarm Spiders don't blink yellow when Isaac has the item.
			* Trites will still uselessly try to target Isaac.
		- Spiders and Big Spiders don't blink red when Isaac has the item.
	+ Unaffected spider enemies include: Blind Creep, Blister, Rage Creep, Ragling, Rag Man's Ragling, The Thing, Trite and Wall Creep.
	+ Affected enemies that deal no contact damage but can still damage Isaac through other methods include: Blind Creep, Blister, Migraine, Rage Creep, Ragling, Rag Man's Ragling, Soy Creep, Tainted Soy Creep, The Thing, Ticking Spider, and Wall Creep.
		- Except for Ticking Spiders, Migraines, and Blind Creeps, all other spiders will still uselessly try to target Isaac for contact damage.
	+ Coal Spiders aren't aggressive to Isaac, but will still deal contact damage.
	+ Twitchies are not counted as "spider" enemies and are unaffected by this item.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a humanoid spider.

## Notes

* If either one of  Jacob and Esau holds Bursting Sack, both gain the benefits.

## Trivia

* This item is similar to , only affecting spiders instead of flies.
* Befitting the name, this item's appearance is similar to a bursting Sack.
Dukie

### Found In

**Dukie** is an enemy added in *The Binding of Isaac: Afterbirth*. It floats diagonally around the room, occasionally spitting out 1-2 Dart Flies. Dukies do not attack in any other way but can still do contact damage.

## Notes

* If there are 6 Dart Flies spawned, Dukies will stop spawning Dart Flies.

## Trivia

* Dukies were inspired by a video by LeatherIceCream about a miniature Duke Of Flies.
* The Duke of Flies is the boss version of these enemies.
Crack Jacks

**Crack Jacks** is a passive item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Grants one full Red Heart container.
	+ Heals 1 additional Red Heart.
* Spawns one random trinket.

## Trivia

* This item is a reference to Cracker Jack, a snack that is well-known for containing a prize in every bag.
* Despite the item description, swallowing the trinket through Marbles or a Gulp! pill has no known additional effect.
Embryo

### Found In

**Embryos** are monsters that hop around the room, dealing contact damage. They are relatively harmless as they do not move much from their position and don’t target the player.

## Trivia

* Embryos count as the Blastocyst boss. Blastocyst still splits into Embryos.
* Embryos bear a strong resemblance to Spewer: the star of the game Spewer which was also created by Edmund Mcmillen, the maker of *The Binding of Isaac*.
* In the original *The Binding of Isaac*, they have health bars (like mini-bosses or bosses have).
* Embryos can often be seen in rooms with Blood Donation Machines.
* In the Bestiary, Embryos have a unique appearance in which they're smiling.
D7

### Collection Grid

*(page 4, column 12, row 4)**(page 4, column 12, row 4)**(page 4, column 13, row 4)*

**D7** is an activated item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Upon use, it restarts the room and respawns all enemies. Pickups or Chests may be granted for clearing the room.

## Notes

* Has no effect in Greed Mode.
* Has no effect when used in a room that had no enemies, Challenge Rooms, or Boss Challenge Rooms.
* Will work in a Mini-Boss Room.
	+ Mini-Bosses will always have the same drop.
* When used in a Boss Room, Devil Room, or Angel Room, Isaac is teleported to another room on the floor, and the room he was in does not reset. The room Isaac teleports to will respawn enemies if it had them.
	+ D7 will not work when used in a Boss Room, Devil Room (it can be used to respawn Mom's Hand or Krampus), or Angel Room.
* When used in a Secret Room that previously contained Greed or Super Greed, the room becomes a regular Secret Room.
	+ No longer rerolls the room into a regular Secret Room; instead respawns Greed or Super Greed (depending on which one was present before).
* When used in a Shop that previously contained Greed or Super Greed, the Shop items will spawn. Rolling it again will cause new items to spawn on top of each other.
	+ No longer spawns a regular Shop; instead Greed or Super Greed respawns.
* When used in a room with a Champion enemy, the enemy will not respawn as a Champion.
* Can be used to generate infinite rewards with both  and  and/or  depending on the enemies in the room.
	+ If Isaac only has either  or , rewards can still be endlessly generated in a quadruple-sized room or an L-shaped room.
* Enemies respawn exactly where they first spawned, even if that's where Isaac is standing, in which case Isaac will take damage immediately upon use of the D7. Right next to doors is usually a safe place to use it.
* If used in the Mirrored World of Downpour or Dross II, the rooms will not only have their enemies respawn, but all the normal non-mirrored contents such as pickups are restored. Using it in the Shop causes it to be stocked normally, and additional uses will restock the Shop's contents, unlike normal Shops.
* As  Tainted Keeper, enemies respawned by the D7 will drop the same type of coins as they had before using the D7. This can be used to quickly generate money from enemies that dropped high-value coins or greatly increase Luck if an enemy dropped a Lucky Penny.
* Enemies respawned by the D7 don't drop loot when killed if they were champions and don't grant score in daily runs.

## Synergies

* : Spawns a grey six-sided die wisp on the middle ring. The wisps start gray; if the wisps get hit while they’re gray, they invoke the effect of the D7 in the current room and turn blue. Damage that turns the wisps from gray to blue is negated.

## Interactions

* : Doubles the amount of enemies summoned, but does not give double rewards.

## Trivia

* Despite being a die item, D7 is not an unlock.
	+ This trait is shared with  and .
Danny Baranowsky

This article is about the composer.
Danny Baranowsky is an American music composer, famous for creating the soundtrack for the original *The Binding of Isaac*. He is also famous for creating the soundtrack to Edmund's other successful game, *Super Meat Boy,* along with the OST to 2015's rhythm roguelike game, *Crypt Of The Necrodancer.*

## External Links

* Danny's official twitter
* Danny's bandcamp
* Danny's Wikipedia page
Cain's Other Eye

### Collection Grid

*(page 4, column 4, row 2)**(page 3, column 14, row 4)**(page 3, column 15, row 4)*

### Unlock Method

 Complete the Boss Rush as  Cain

*Not to be confused with , , or .*

**Cain's Other Eye** is an unlockable passive item.

## Effects

* Spawns a familiar that floats slowly around the room in a zig-zag pattern similar to  and shoots normal tears in the same direction as Isaac. Each tear deals 3.5 damage.
	+ Each tear deals Isaac's damage.
* Spawns a familiar that follows Isaac and copies all of his tear modifiers/stats, with a 25% damage reduction. It fires randomly in the cardinal directions.

## Notes

* Unlike , Cain's Other Eye does no contact damage.
* This item is functionally identical to , except it fires in a random direction. For a list of synergies and interactions, visit that page.
* Familiars that follow behind Isaac have a certain priority in how close their position is to him over other familiars, with Cain's Other Eye having 5th priority.

## Interactions

* : Cain's other eye gains a crosshair and rocket similar to Isaac's but smaller. Caution is required, as the crosshair is erratic and will constantly shake, possibly making the rocket hit Isaac.
* : The familiar's tears travel a very short distance in their original direction and can be controlled afterwards.
* : Cain's Other Eye will attempt to fire directly at enemies but only when they are on the same side as the random direction it is firing in.

## Trivia

* This item is implied to be the damaged eye of  Cain beneath his eyepatch.