recursal/Fanatic-Fandom huggingface dataset:
The Left Hand

*For the trinket with a similar name, see Monkey Paw.*
**The Left Hand** is an unlockable trinket.

## Effects

* Replaces all types of Chests with Red Chests.

## Notes

* The effect includes Chests already spawned. Entering a room that previously contained other types of Chests while holding The Left Hand will turn them into Red Chests permanently.
	+ Chests that have already spawned are not converted into Red Chests.
* It is advised to drop The Left Hand (by holding either *CTRL* key for few seconds, holding R2 or RT for 3 seconds on PS4 and Vita and Xbox One, respectively, or holding ZR on the New Nintendo 3DS / Nintendo Switch for a few seconds) before entering Chest, as non-Red Chests always contain item pedestals on this floor, especially the 4 located in the starting room.
	+ Isaac may prefer Red Chests for their possible Soul Hearts or Red Chest items, at the expense of guaranteed items.
	+ Locked Chests converted in Chest's starting room will contain Devil Deals, potentially allowing for more powerful items, but at the cost of Hearts.
		- Red Chests found past the starting rooms of either Chest or Dark Room will contain regular Red Chest drops. Dropping the trinket before leaving the starting room is advised.
* Bomb Chests are affected by The Left Hand.  Old Chests and  Mega Chests are not affected.

## Interactions

* : Overridden by The Left Hand.
* : Enemies killed by keys will only give the contents of red chests allowing items to be obtained through Sharp Key more consistently.

## Trivia

* The Left Hand is a reference to occult beliefs in which the "The left hand path" is associated to black magic.
* The Left Hand is the only item in the game with 2 separate conditions for unlocking it, being unlocked by killing Ultra Pride, or by defeating ??? in Chest as  Judas
Wooden Spoon

**Wooden Spoon** is a passive item.

## Trivia

* In his first post-Repentance Lore Stream, Edmund McMillen revealed that the wooden spoon is inspired by the fact that during his childhood his parents would threaten to beat him with a wooden spoon.
	+ The Wooden Spoon granting a speed up is a nod to the act of running faster to try and escape the abuse.
	+ In this way, the Wooden Spoon is a counterpart to , which is also a speed-up item based on a specific object used by McMillen's parents to abuse him.
V1.06.0190

* There is a new "rumble" option in the options menu. However, it only appears on the Nintendo Switch version of the game, which was currently unreleased at the time.

### Changes

* Adderline was renamed to Adrenaline.
* The Vurp! pill won't spawn itself anymore.
* Krampus' new Brimstone attack was smoothed out.
* Stoneys now have a better panting behavior.

### Fixes

* The bug where the rewards for the Onan's Streak and The Guardian challenges were incorrectly swapped was fixed.
* now updates the "speed" and "firedelay" caches, meaning it no longer is a delayed tears up and a delayed speed down.
* All of the bugged `DecreaseBy` values for the Afterbirth+ items have been fixed, meaning that Afterbirth+ items will no longer roll into themselves in pools where they are supposed to be removed on sight.
* Fixed the graphics for the Ed Baby and the D Baby (2 of the co-op babies).
* The entity stacking feature is fixed. This results in many changes throughout the game, like getting Restock Machines in shops.
* Fixed the bug where Magdalene would be shown as having a pill on the character select screen before beating the Aprils Fool challenge.
* Fixed the bug where Samson would be shown as having  on the character select screen before beating the Ultra Hard challenge.
* Fixed the bug where Lazarus would be shown as having  on the character select screen before beating the Backasswards challenge.

## New bugs

* Accidentally added a bug to the description of  (it will no longer appear in-game).
Rotten Meat

**Rotten Meat** is a passive item.

## Effect

* Grants one full Red Heart container.
* Heals 1 additional Red Heart.

## Notes

* This item can rarely drop from polyps in the Corpse.

## Synergies

* : When Isaac picks up Rotten Meat it now grants: a permanent +1.0 Damage and +2.5 Range, a temporary +3.6 Damage (which diminishes to 0 in 30 seconds), heals 1 additional red heart, and takes a permanent -0.03 Speed reduction.
	+ Item pedestals can also cycle between the initial item and Rotten Meat due to Binge Eater.

## Trivia

* In Edmund McMillen's first post-Repentance Lore Stream, he revealed that Rotten Meat was intended to be a reference to the meat which must be fed to the Hungry Goriya which blocks the path in the original Legend of Zelda.
	+ However, the food from the Legend of Zelda is not *necessarily* rotten.
* Rotten Meat’s sprites can be seen as part of .
* Rotten Meat is the only item affected by Binge Eater that does not have the name of a type of meal.
Wooden Cross

**Wooden Cross** is an unlockable trinket added in *The Binding of Isaac: Afterbirth † (Booster Pack #1)*.

## Effects

* Grants a shield which nullifies a single hit once per floor.

## Notes

* The shield granted by Wooden Cross stacks with , , and .
	+ It does not, however, stack with the ; both are treated as the same shield.
* The shield of Wooden Cross has a higher priority than Holy Mantle or Blanket and will be lost first when hit.

## Interactions

* Golden Trinket: No additional effect.
* : No additional effect.
* : Each effect/trinket copy stacks granting an additional shield per stack. However, if at least one of these shields nullifies a hit all shields are removed when Isaac leaves the room.

## Gallery

* Wooden Cross's appearance prior to Booster Pack #2.

## Trivia

* Wooden Cross is based on this Steam Workshop trinket by Striped and cathery.
Wavy Cap

**Wavy Cap** is an activated item added in *The Binding of Isaac: Repentance*.

## Effects

* Gives Isaac +0.75 fire rate which goes past the normal cap, -0.03 speed, and distorts the screen and background music. The effects can be stacked in the same room, and the distortion becomes more pronounced with repeated use. After repeated uses, the colors begin to turn very bright and intense.
	+ Each use increases the recharge time, which starts at 0.5 seconds with the 1st use, and ends with 15 seconds on the 9th use. After the 10th use, it no longer recharges automatically though it can be recharged and used even more through Lil' Batteries.
	+ Leaving the room doubles the speed penalty and multiplies the fire rate bonus by x0.4, for the uses in that room.
	+ Clearing a room removes one use's worth of penalties and bonuses, giving +0.06 speed and -0.3 fire rate.
	+ Isaac's costume will change the stronger the Item's effects get.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a walking mushroom.

## Notes

* This item can very rarely drop from mushrooms in the Secret Room.

## Synergies

* +  as  Judas /  Dark Judas: Gives a damage bonus which lasts until the next floor equal to 0.2 \* the maximum number of times Wavy Cap's effects have been stacked.
* : Creates a single mushroom wisp on the middle ring, firing 1.5 damage tears. Only one of these wisps can exist at a time.
* : The distortion effect will wear off eventually, but the highest reached fire rate bonus won't. However, Wavy Cap will no longer have any positive effects until an even higher bonus is reached.

## Interactions

* Tainted Lazarus: The distortion effect will not be removed when flipping between characters.

## Trivia

* Since the fire rate increase is flat, it is technically possible to reach the hard cap of 120.0 with enough uses. In practice this renders the game unplayable due to distortion.
* The distortion effect applied to Isaac is very similar to the one seen in *Yoshi's Island* when touching a Fuzzy.
* On final stages of the distortion, the wave effect will make appear parts of the top of the screen on the lower screen and the lower screen on top of the screen, while bright colors dance on the screen, similar to how psychedelic trips are described.
* This item originated from *Antibirth* and was called Black Mushroom.
	+ Before that, it appeared in the Community Remix mod for Flash Isaac under the name "Black Mushroom," where it permanently increased tears and decreased speed, with no screen distortion.
* Wavy Cap, also known as *Psilocybe cyanescens,* is a species of potent psychedelic mushroom.
V1.06.J791

## Documented Changes

### Balance Changes

* Chance to find max level Shops in Hard mode increased to 50%, and back to how they were previously in normal mode.
* Added Restock Machines back to Shops, with a 25% chance to replace the Donation Machine.
	+ This does not occur in game and is only documented.
* Tinted rocks are now more common in Hard

### General Fixes

* Fixed a crash caused by dying and reviving during the Rotgut fight
* Fixed a crash caused by  tears
* Reap Creep can no longer appear on the Scat Man challenge to reduce the likelihood of unfair softlocks
* Fixed I Found Pills causing  Keeper,  Apollyon,  ???, and  The Forgotten's head to disappear
* Fixed Chub and other bomb eating bosses causing a crash when swallowing rockets
* Fixed being able to unlock  by saving and resuming a run or by entering a certain area
* Fixed  getting canceled when taking damage before the rocket hits the ground
* Fixed Delirium's death animation getting stuck in an endless loop when he dies while slowed or sped up
* Added a tentative fix for corrupted graphics caused by burrowing enemies on AMD graphics drivers
* Entering certain floors now attempts to place the player in a safe spot to prevent instant damage from any room hazards
* Fixed pickup animation getting stuck when using certain active items while holding a red bomb
* Fixed Bestiary entries for some Vis enemies that were missing graphics
* Touching certain fires no longer triggers  bleed effect
* Touching certain fires no longer rerolls Eden
* Fixed an unintended interaction with certain fires and
* Fixed a rare situation involving Eden tokens which could cause the character selection menu to be stuck on the wrong side
* Fixed a crash caused by using  while having
* Fixed  allowing single-use items to be reused endlessly
* Fixed Wormwood sometimes getting stuck underwater when slowed down
* Lightning flashes in Downpour have had their brightness reduced to accommodate for users with sensitive vision

### Book of Virtues Fixes

* Added  wisps
* Fixed  wisps not dying as expected
* Fixed a crash caused by  wisps
* Fixed a possible crash caused by  wisps
* Fixed a possible crash caused by  wisps
* Fixed a possible crash caused by  wisps
* Fixed a possible crash caused by  wisps
* Fixed interaction between wisps and

### Co-op Fixes

* Fixed infinite boss item respawn exploit
* Dead co-op players are now revived only when the end-of-floor boss is defeated
* Fixed challenge runs
* Fixed dead co-op player being able to unlock certain doors
* Fixed not being able to start co-op if Player 1 has one or less red hearts

### Misc

* Added several missing bestiary entries
* Updated various room layouts
* Updated sprites for Sins and Super Sins
V1.06.J85

## Undocumented changes

### Additions

* Blowing up Mom's dressing table will now cause it to vanish and drop 1-4 pills. There is also a 1% chance to spawn , , , , , , , , , or .
* now contributes towards the Bookworm transformation.
* I'm Excited!!! now turns into I'm Drowsy when holding .

### Fixes

* Fixed the bug where  incorrectly had 1 charge.
* Fixed the bug where  incorrectly had 1 charge.
* Fixed an issue where holding  in a Devil Room would crash the game.
* Fixed the bug with Caves room #208 where it was never given any doors.
* Fixed the bug where Booster Pack #2 items were given the wrong DecreaseBy value in the "itempools.xml" file.
* Fixed the bug where the picking up the  or  after having  would not properly update your damage.
* The Leprocy item is now spelled correctly as .
* Fixed the bug where  and  would damage Isaac.
* Fixed the bug where the Delirium version of Gurglings didn't use their unique sprite.
* Fixed the bug where beating an objective that should grant a completion mark with a modded character would make the game crash.
* The Levathian transformation is now spelled correctly as Leviathan.
* An exploit involving  has been fixed. [*further explanation needed*]
V1.05

* When the player has  and , tears will not begin shrinking until they start moving.
* Modified the enemy creep animation.
* Modified the teleport animation.
* Removed the Lemon Party pill's white flash.
* Shortened the window to steal a Boss Rush item with a teleport and have the other items remain.
* Improved the damage on the beams from .

### Fixes

* Pin and Scolex's health bars now accurately depletes.
* Libraries now correctly play their music track.
* Fixed the bug where the player could play as Eden even without having any Eden tokens available.

## New bugs

* shots no longer affect machines and beggars.
* no longer provides invincibility from  shots.
V1.9.6 (Beta)

### Links

None

The online beta received a patch on January 6th, 2024, announced on Twitter.

## Documented Changes

* Revive machines added to each floor
	+ Reviving a player costs 10 coins
	+ Exploding the revive machine sometimes drops an eternal heart
* Sun card + Isaac's Bed heals all players
* Co-op ghosts flight + can interact with some objects
* Co-op ghosts revived by eternal heart
* Left-Alt/L3 emote wheel

### Fixes

* Starting items are accessible if unlocked
* Lost and T.Lost health after revival corrected
* Schoolbag don’t drop 2nd active item on death
* Rerun save issue
* No Victory Lap Completion Mark
* Cannot join Victory Lap in progress
* Revival cosmetic issues
* Runs unjoinable when victory lap begins
* Tainted Blue Baby with Birthright correct poop limit
Widow

Degraded Boss

**Widow** is a boss that can appear in the Cellar.

## Behavior

Widow makes large leaps towards Isaac, at approximately double the distance of Monstro, and can perform the following attacks after landing:

* Leaves a puddle of White Creep and spawns a Sack.
	+ There is a maximum of 3 Sacks alive at once.
* Spits out a Spider.
* Widow can kill her own Spiders and Sacks if she jumps on top of them.

## Champion Versions

**Black**: Spawns Big Spiders with half health instead of Sacks, Black Creep instead of White, and spits out six blood shots instead of Spiders.
**Pink**: Spawns Boils instead of Sacks and Attack Flies instead of Spiders. Jumps quicker.  She is also 25% smaller and has 10% less health.
## Gallery

* Widow ingame.
* Black Champion Widow.
* Pink Champion Widow.
* Widow as one of  Delirium's forms.

## Trivia

* Widow was added in the *Wrath of the Lamb* DLC for the original *The Binding of Isaac*.
* She is the boss version of the Trites.
* The Wretched is the posthumous version of her.
* The name probably refers to the *Latrodectus*, commonly known as "black widow spider".
* Widow's and The Wretched's animations and behavior have been sped up to more closely resemble their Flash counterparts.
Waka Waka

**Waka Waka** is Challenge #17. Start off with  and . The goal is to defeat Mom. This Challenge is available by default.

## Difficulty

Shots do not travel right away. They stay in place. With the added magnetic property, this can cause enemies to slingshot through tears to hit Isaac.

## Strategy

* Isaac can lay a trail of tears that draws enemies into each tear. However, if done carelessly, momentum will often carry them past fired tears into Isaac. Make sure there is a safe distance between him and the enemy before firing.
* Try to be accurate - if the tears hit the enemy and disappear, the side-effects of Strange Attractor is reduced, whereas if they miss, they may pull other enemies towards Isaac, increasing the risk of damage.
* Enemies that chase Isaac such as Lust or Globins are particularly dangerous as firing carelessly will pull them towards him. Maintain a safe distance, fire, run away, and repeat.
* Items that are behind gaps or spikes can be pulled towards Isaac by firing tears past them.
* overrides the anti-gravity tear effect while increasing your overall damage, on top of eliminating the chance for enemies to get too much momentum due to the low amount of tears on screen.
* is especially useful for this challenge, as it creates a stationary ball totaling ten highly damaging tears that have a very strong magnetic pull. The one-room charge time allows Isaac to clear rooms with much greater ease than by using the common method of attack with this challenge.
* is a useful pickup in this challenge. It retains the magnetic property of Strange Attractor but can be fired as it normally would, making this challenge, for the most part, a normal run with the item.
* is a good pickup to look out for. Since Isaac's bombs are affected by the Strange Attractor, it will pull enemies towards the bomb, similar to a homing effect.
* is a good item to have since it can be controlled remotely to kill enemies while keeping Isaac safe.
* is a good item to grab. Enemies are attracted to the beam and will be damaged more often as a result.
* Having multiple tears in one spot will cause the magnetic pull to become stronger. Use this to pull enemies out from tight spaces, or deal massive damage to one enemy.
* If there is difficulty completing this challenge, a good tactic is to quickly tap the arrow keys to fire tears normally and mostly avoid the effects of Anti-Gravity.
* The 1 pip and 6 pip dice rooms will not reroll the starting items for this challenge but will reroll any others.
* is a good pick up as Isaac moves around while firing tears, the baby will follow with delay and duplicate tears.
* Items that give homing are very useful because when enemies get attracted to the tears, the tears go towards the enemies.

## Reward

* Death's Touch - Complete **Waka Waka (challenge #17)**.

## Trivia

* *Waka Waka* is the sound *Pac-Man* makes when eating pellets, and the enemies in this challenge follow Isaac's trail of floating tears similarly.
Undefined

### Collection Grid

*(page 4, column 9, row 2)**(page 3, column 19, row 4)**(page 3, column 20, row 4)*

### Unlock Method

 Complete the Boss Rush as  Eden

**Undefined** is an unlockable activated item.

## Effects

* Teleports Isaac to the Treasure Room, the Secret Room, the Super Secret Room or I AM ERROR. There is also a 1% chance of teleporting into a Black Market.
	+ The chances for each main destination are equal.

## Strategies

* The I AM ERROR room in Cathedral and Sheol will have a beam of light/trap door leading to the next floor, even if Isaac doesn't have  or .
* Chest and Dark Room are reset on exiting the I AM ERROR room, which can be done repeatedly as long as the player can gather enough charges to successfully warp to it. This can provide a ridiculous number of items from the golden chests in Chest.
	+ This makes it possible to kill ??? or The Lamb multiple times. If Isaac has an item that resurrects him as a different character, multiple achievements and items can be unlocked in a single run.
	+ The Void is also reset and can be cleared repeatedly.
* As no Secret Rooms or Super Secret Rooms spawn on any floor during the Ascent, this item will only warp Isaac to either the Treasure Room or the I AM ERROR room. This can be a reliable method of gaining many items on the way up to Home, while also allowing the player to skip potentially difficult encounters.
* Has no effect when used in Home.
* Using Undefined on ??? always sends the player to the I AM ERROR room. The Error room will always contain a trap door, not a lightbeam, so it will always send the player to Sheol.

## Synergies

* : Creates blue glitched wisps on the middle ring. Wisps fire tears with  effects.

## Trivia

* The item is a reference to a bug in the original *The Binding of Isaac*, where exhausting an Item Pool (or rarely simply by chance) would cause an item to spawn whose name and description was listed as "Undefined", and whose sprite would rapidly cycle through the sprites of every other item in the game. Undefined by itself creates no effect, but if it was ever picked up, should the game attempt to spawn an item from an exhausted item pool, the game instead crashed, as it could no longer spawn Undefined. From *Rebirth* onwards, an exhausted item pool will instead spawn , even if the item would normally never spawn from that item pool and/or Breakfast had already been obtained in the run.
* In programming "Undefined" refers to an unknown value.
* Given the Glitch theme of the item and the ability to access Chapters that have not yet been unlocked using I AM ERROR, along with the ability to acquire mass upgrades in The Chest and The Dark Room, it is possible that it was intentionally made into a powerful sequence-breaking item.
* The sprite for Undefined appears to be, fittingly, a glitched and spliced version of other item sprites, with the bottom right part noticeably being the , the bottom left being the , and the top half being . This may also be a reference to Undefined's sprite in the original *The Binding of Isaac*.

## Gallery

* 3DS The icon of Undefined as seen on the lower 3DS screen
We Need to Go Deeper!

**We Need to Go Deeper!** is an activated item.

## Effects

* Spawns a trapdoor that leads to the next floor upon activation.
	+ There is a 10% chance the trapdoor will instead lead into a Crawl Space.
	+ Some tiles will appear with a special graphic (for example grass or a piece of garbage in Basement). Using this item on these tiles will guarantee a Crawl Space. Only one trapdoor to the Crawl Space can be made per floor, as all subsequent uses will guarantee a trapdoor to the next floor.
	+ If used in Womb II/Utero II/Scarred Womb II, the trapdoor will always lead to Sheol.

## Notes

* All Crawl Space trapdoors on a floor lead to the same Crawl Space.
* Has no effect in the Cathedral, Chest, Sheol, Dark Room, ??? and The Void (no trapdoors of any type will be generated).
	+ Can only create crawl space trapdoors in the aforementioned stages and in Corpse II, Home and during the Ascent.
* Using the item on the 3 tiles next to a door, including Secret Room entrances, will cause the trapdoor to spawn in a random spot next to Isaac instead, making this item an indirect aid to locating Secret Rooms.
	+ If a special graphic is in these spots, the trapdoor will likely be moved to a spot that wont spawn a Crawl Space.
	+ Spawning enough trapdoors can cause a trapdoor to spawn in these spots.
* This item can be used to destroy rocks if used while Isaac is flying over a rock.
* This item can be used to create a trapdoor to Sheol on Womb, even before Sheol has been unlocked.
* When used on the last floor of a challenge, a trapdoor to the next floor can spawn. If it is entered, Isaac must beat the boss of that floor to spawn the ending trophy.
	+ While trapdoors will no longer spawn on challenges on floors at the final destination, certain challenges like Red Redemption may still spawn a trapdoor leading to the next floor.
* The item may be used on the Dirt Patches in the Dark Room to dig up a random type of chest.

## Synergies

* : Spawns a skull wisp on the middle ring that shoots bone tears.
* : In most cases, no extra effect. When used near the entrances to a room, the item can occasionally open 2 trapdoors at once,  increasing the chance of opening a Crawl Space.

## Trivia

* The name of this item is a reference to the movie *Inception*.

## Gallery

* 3DS The icon of We Need to Go Deeper! as seen on the lower 3DS screen.
V1.06.J34

*This was the first initial version of Booster Pack #1 for the Afterbirth † DLC expansion. For an overview on content added in Booster Pack #1, please see this page: Booster Packs*

## Documented changes

### New items

* (511), which is based off this Steam Workshop item by Custom Phase.
* (512), which is based off this Steam Workshop item by Custom Phase.
* (513), which is based off this Steam Workshop item by Electoon.
* (514), which is based off this Steam Workshop item by Freeze.
* (515), which is based off this Steam Workshop item by Mills.
* (516), which is based off this Steam Workshop item by Kieran & Stewartisme.
* (517).
* (518), which is based off this Steam Workshop item by Scayze & Ashkait.
* (519), which is based off this Steam Workshop item by Scayze & Ashkait.

### New trinkets

* (120), which is based off this Steam Workshop trinket by Zarat.us.
* (121), which is based off this Steam Workshop trinket by Mills & ep.
* (122) (This trinket was designed by Florian Himsl, developer and programer of the original *The Binding of Isaac* game.)

### New cards

* (52), which is based off this Steam Workshop card by JOHN MADDEN.
* (53), which is based off this Steam Workshop card by JOHN MADDEN.
* (54), which is based off this Steam Workshop card by JOHN MADDEN.

### New features

* Added 5 new Eden hairstyles, which is based off of this Steam workshop mod by Niche Hobby Robot.
* Added a new option in the menu for charge bars, which is based off of this Steam workshop mod by Wofsauge.
* Dice rooms now have a small icon in the corner of the room that denotes what the effect of the room is, which is inspired by this Steam Workshop mod by Wofsauge.

## Undocumented changes

### Changes

* Lil' Brimstone got renamed to .
* Lil' Haunt got renamed to .

### Fixes

* Fixed the bug where  and  would not synergize properly.
* Fixed the bug where  and  rerolls were unseeded.
* Fixed the bug where  and  would not synergize properly.
* Fixed the bug where  and  would not synergize properly.
* Fixed the bug where you could use a  to duplicate an empty item pedestal.
V1.06.0052

## Undocumented changes

### Additions

* Added a counter when donating to the Greed machine that shows the chance for the machine to jam.

### Changes

* Increased HP:
	+ Ultra Greed's blank coin 35 → 100.
	+ Ultra Greed's key coin 50 → 100.
	+ Ultra Greed's bomb coin 20 → 100.
	+ Ultra Greed's heart coin 20 → 100.
	+ Blue Gaper 9 → 30.
* The room before the Ultra Greed fight now contains several mini-bosses instead of only Monstro.
* The  animation was updated to be smoother (with more frames of animation than before).
* The  tear effect was updated to be more easy on the eyes.
Wiggle Worm

**Wiggle Worm** is a trinket.

## Effects

* Isaac's tears travel in a wave-like pattern.
* +0.4 Tears up.
* Grants spectral tears.

## Synergies

* : Tears now travel in a double helix pattern.
* : The altered pattern tears travel in is confined to the beam allowing Isaac to use its benefits without losing accuracy.
* Golden Trinket /  / : In addition to further stat increases, each effect/trinket copy causes the path of tears to become even wigglier.
* : Rings take a star-shape, slightly increasing their area of effect.

## Trivia

* Wiggle Worm was a passive item in the original *Binding of Isaac*. The likely reason for the change to a trinket is the situational usefulness of this shot pattern, along with the new ability to drop trinkets on demand. It took ItemID #59, which is now unused.
	+ ItemID #59 is now used by the passive  created by the  effect from  Judas/ Dark Judas.

## Gallery

* Concept for Worm Trinkets, including Wiggle Worm.
XML Modding

**XML Modding** is an aspect of Modding that applies to altering XML files. The capabilities are limited depending on the XML file that is being modded. In Afterbirth+, mods can add new content to an existing XML file under the content folder of the mod.

For modding Challenges, see Custom Challenges.

## bosscolors.xml

* The bosscolors.xml file contains all champion variants of bosses.
* The root element is `<bosscolors>` which contains separate `<boss>` elements inside it.

### Boss

The individual `<boss>` elements are used to define champion variants for each boss. It contains the id and variant of the boss.

 variant

#### Color

* The `<color>` element is a child of `<boss>` and is used to determine the champion's color, scale and HP.
* Multiple `<color>` elements can be added in each `<boss>` element in order to add more champion variants in the game.

 health
 scale

## players.xml

The players.xml file contains information and statistics about the different characters.

### Players

The root element is `<players>`, which may contain attributes that identify the root directories for graphics.

 nameimageroot
 portraitroot
 bigportraitroot

#### Player

The meat of the file are the individual `<player>` elements. These contain the file names and a number of statistics of each character.
V1.06.J127

### Changes

* is now treated as a weapon by the game, so it should behave slightly differently and synergize with more things.

### Fixes

* Fixed the bug where the  and  synergy would cause tears to become invisible occasionally.
* Fixed the bug where the "yellow" charge from  would transfer to other items.
	+ This fixes the bug where you could get unlimited charges on an item with  and the .
	+ For modders,  charge is now stored per pedestal.
* Fixed the bug where  would prevent  from shooting tears, effectively soft-locking the game if you picked it up on Lilith.
* Fixed the bug where the  and  synergy would damage you occasionally.
* Fixed the bug where the  and  synergy would cause you to get "free" charges.
* Fixed the bug where the Backasswards challenge was not functioning correctly.

### Lua API

* EntityPlayer.QueueItem got renamed to EntityPlayer.QueuedItem due to a naming conflict. It is now possible to detect the item that is currently queued, meaning the item that Isaac is holding overhead. This gives modders much more precision, as before they had to rely on the clunky EntityPlayer.IsItemQueueEmpty() function.
* EntityPlayer:RemoveGoldenBomb() got added.
* EntityPlayer:RemoveGoldenKey() got added.
* The Battery now stores its charges per pedestal. EntityPickup.Charge will now be 12 for a D6 that is double charged, for example.
V1.06.J119

* Fixed the bug where Flooded Caves room #976 was accidentally given 1000 weight, and would appear in almost every run.
* Fixed the bug where the Soul Sucker had the wrong bestiary animation.
* Fixed the bug where using  with the  trinket caused the game to crash.
* Fixed the bug where the Rage Creep in the top right hand corner of Womb/Utero/Scarred room #202 would damage you if you were standing along the top wall during its first attack.
* Fixed the bug where the "Rerun" option on the menu would never appear as long as you had at least one mod enabled.
* Fixed the bug where you could wrong warp by dying (with extra lives) immediately before going to the next floor. (This was only possible by using Sacrifice Rooms to teleport to the Dark Room or by playing on the DONT STOP custom seed.)
* Fixed the bug where the player would be invisible after respawning if they teleported during a death animation.
* Fixed the bug where  +  +  would crash the game.

## New bugs

* Continuing a run won't correctly apply passive effects of items contained in the .
* The  and  together can be exploited to gain unlimited charges, as shown in this video.
V1.9.5 (Beta)

The online beta received a patch on January 2nd, 2024, announced on Steam.

## Documented Changes

* Mom's bed now revives all players
* Online Matches Hard Mode online

Fixes

* Pedestal item functionality
* Book of Virtues + Mr. Me! wisps killing themselves on cooldown doors
* Easter egg menu
* Player off-screen indicators would sometimes display the wrong character
* Desync if a player paused while a fullscreen overlay (ex. rainbow poop) was going
* Aimed attacks (ex. Marked, Ludovico, etc.) could slightly move the camera of other players
* Players revived after special bosses (ex. Mother)
* Lilith ghost baby from shooting
* Wisps staying around after player dies
* Lockup in text chat under specific conditions
Voodoo Head

**Voodoo Head** is a passive item added in *The Binding of Isaac: Repentance*.

## Effects

* Spawns an additional Curse Room on each floor, if possible.
	+ Doesn't work on the Ascent.
* Curse rooms have improved layouts and rewards while Voodoo Head is held.
* A coin is guaranteed to spawn in Curse Rooms.

## Notes

* Has no effect in Greed Mode.
* The singular coin generated by the item in curse rooms cannot be a special coin (nickle, dime, lucky, etc).
* Does not spawn a coin if Voodoo Head was picked up on the same floor.
* This item is beneficial for  The Lost due to the chance of obtaining  or  in curse rooms. However, use caution as the run can easily end from being hit while fighting any enemies inside. A teleport card, such as , would be advised to prevent such situations.
* This item is also very beneficial for  Tainted Judas or  Tainted Forgotten, as they can enter and leave curse rooms for free.
* The coin that spawns, while minimal for most characters, is considerably useful for  Keeper and  Tainted Keeper, letting them partially heal from the curse room door's donation and letting Tainted Keeper leave even if there are no enemies to get coins from.
* This item causes the level generation to increase the minimum number of dead ends on each floor by 1, increasing the likelihood of curse rooms spawning.
	+ The level generation does not guarantee an additional curse room can be placed; there is limited space for special rooms, and other types may take priority over it.
		- If a curse room doesn't spawn, it's possible Voodoo Head still increased the dead end count, giving you an extra special room.

## Trivia

* Voodoo Head is from the *Antibirth* mod where it had similar effects, except it would not improve the contents of Curse Rooms.
Vasculitis

**Vasculitis** is a passive item added in *The Binding of Isaac: Repentance*.

## Effects

* Upon killing an enemy, 1 - 16 tears are released from them in random directions.
	+ The amount of tears released from an enemy is based on the enemy's health, and is not affected by Isaac's damage, nor the number of tears hit.
	+ These tears are red in coloration, regardless of Isaac's tears, but will inherit the coloration of applied status effects.
* Burst tears will do set damage per floor. The formula for this is: (3.2 + 0.3 x stage).

## Notes

* If an enemy is killed while affected by a status effect, the burst tears will inflict the corresponding effect.
* Homing, range and shot speed do not affect Vasculitis.
* Released tears can be difficult to distinguish from enemy shots, especially from enemies which split in to burst shots upon death such as Red Boom Fly and light blue champions.
* All forms of damage will cause an enemy to release tears.

## Interactions

* Ace Cards: Enemies that are turned into pickups can’t release tears.
* /: Enemies that are turned into poop can’t release tears.
* : Not recommended. Vasculitis' tears can explode, with great potential to harm Isaac.
* Freeze Effects: Enemies that die from being frozen can’t release tears.
Walnut

**Walnut** is a trinket added in *The Binding of Isaac: Afterbirth †*.

## Effects

* Being hit with explosion has a 33% chance to destroy the trinket and spawn a Coin, a Heart, a Key and another trinket. The pickups may be of any normal variety.

## Notes

* Taking damage from the explosion is not required to trigger the effect. This makes effects granting Invulnerability very useful for safely destroying the Walnut.
* Getting hit by multiple explosions at once still counts for the required number, even if they deal only a single explosion worth of damage due to invincibility frames.

## Synergies

* : As Bomber Boy causes 9 explosions at once, laying a bomb and not moving before it explodes is almost guaranteed to trigger the trinket.
* : Isaac will not be knocked back from the explosions, but it will count for the trinket.
* : Explosions hitting the mantle still count for the trinket.
* / : Isaac becomes immune to explosions, which allows to get the effect without any risk.

## Interactions

* Gulp! pill//: Walnut will still only activate once after being absorbed.
Whore of Babylon

**Whore of Babylon** is a passive item.

## Effects

* Grants +1.5 Damage and +0.3 Speed whenever Isaac has a Half Red Heart or less.

## Notes

* Eve starts with this item by default, and has the following extra effects:
	+ The item is activated at one full Red Heart or less.
	+ Her damage multiplier increases from 0.75 to 1.0 when active.
* The effect is removed after leaving a room with more than half a heart (more than one full heart for  Eve).
* The effect may not be immediately applied if Isaac has lost red hearts without taking damage; the effect will activate upon entering a new room.
* The effect is always active for characters without Red Heart containers, such as  ??? and  The Lost, though other characters can also lose their heart containers through Devil deals or items like  or .
	+ This also includes  Tainted Jacob after being hit by Dark Esau.
* grants a similar effect to Whore of Babylon for the current room which does stack with Whore of Babylon.
	+ Stacking *The Empress* on Whore of Babylon either via multiple cards or multiple activations of  increases damage by the number of uses *squared*, e.g. +1.5 \* 2 \* 2 total damage bonus for using the card on top of activated Whore of Babylon.

## Interactions

* Keeper: As Keeper cannot have half of a Coin Heart, this item has no effect on him.
* Rotten Hearts: Counts as a full Red Heart for the purposes of this item, rendering it impossible to activate (except for  Eve).
* : No further effect when multiple copies are acquired.

## Gallery

* Eve as she appears under the effect of Whore of Babylon.
* The pop-up that appears whenever Whore of Babylon activates.

## Trivia

* Upon obtaining the Whore of Babylon effect, a popup displaying the text *"What a horrible night to have a curse"* appears on-screen. This can be disabled in the game options.
	+ This text is a reference to *Castlevania II: Simon's Quest*. In the game, the text appears when the sun goes down.
* In the original *The Binding of Isaac*, Whore of Babylon gave a higher stat increase just for the room it was activated in, with +2.16 damage and +0.36 speed.
	+ was also much stronger, with +3.375 damage and +0.45 speed.
* The Whore of Babylon is an evil creature mentioned in the Book of Revelations.
* This item is used in Darkness Falls (challenge #4).
Wizoob

### Found In

**Wizoobs** are ghost enemies that disappear, then reappear near Isaac and spit a cluster of spectral tears at him. While they can appear to any side of Isaac, they most often will appear below him.

### Notes

* They can spawn in unique Devil Room layouts if Isaac is holding the .

## Variations

### Stage HP

 25 20
 5 4

### Found In

**Red Ghosts** behave the same as Wizoobs, but fire a  beam instead of spectral shots.

## Gallery

* Sketches of monsters for the Binding of Isaac: Rebirth, including the Wizoob in the sixth square of the third row. In the concept art, it's originally called "Wizoos."

## Trivia

* Wizoobs may be a reference to Wizrobes from *The Legend of Zelda* due to their similar names, similar sound effects, and attack patterns.
* They could be a reference to Boos from the *Super Mario* series as well, considering that they look and act like boos, as well as having "boo" spelled backward at the end of their name.
* Wizoobs and Red Ghosts are the only entities in the game whose Stage HPs were reduced between expansions.
Womb

*(chapter 4)*

**The Womb** is the fourth chapter of the game, unlocked after beating Mom. From the Womb onwards, all damage taken will do a full heart of damage to the player's health (unless the player has ), regardless of the source. Like the Depths/Necropolis/Dank Depths, the Womb's second floor has a preset boss that will always be fought: Mom's Heart initially, and It Lives after beating Mom's Heart 11 times.

The Womb has two alternate floors. The Utero, which, unlike alternate floors before it, does not need to be unlocked separately from the Womb, and the Scarred Womb.

From this chapter onwards, floors do not include item rooms or shops, meaning that all item buying must be done before the player leaves The Depths/Necropolis/Dank Depths.

## Bosses

### Final Boss

Mom's Heart will always appear in the second floor of this chapter or in the last boss room if Curse of the Labyrinth is active. Once It Lives is unlocked, it will appear instead of Mom's Heart.

## Notes

* It is possible to access the Womb before unlocking it by using a  or  on The Depths II.
* Using the Rune of Ehwaz or We Need to Go Deeper on Womb/Utero II will lead the player to Sheol, which will skip any of Mom's Heart's endings.
* Since shops no longer spawn in the Womb, it may be advisable to donate Isaac's remaining coins to the Donation Machine in the shop on Depths II.
* Beggars still have a chance to spawn in Secret Rooms or can be spawned with , so some coins should be saved if you want to donate them to a Beggar.

## Unlockable Achievements

* Eden - Complete Chapter 4.

* Pop! - Beat Chapter 4 without taking damage.

* Mama's Boy - Beat Chapter 4 without taking damage.

## Trivia

* The Womb being mentioned in Isaac's last will as a "warm place" is a reference to how the inner human body temperature is quite high.
* The Womb has a slight static filter covering the screen, possibly to represent heat.
	+ The Utero shares this same static filter.
* In the original Binding of Isaac, Lokii and Teratoma were exclusive to the Utero.
	+ Teratoma was moved back to the Utero.

## Music

* The music for the Womb is titled *Viscera*.
	+ The term viscera represents the internal organs in the body.
	+ The Utero shares this same track.
* The music heard during the fight against Mom's Heart/It Lives is called *Ventricide*. Ventricide combines ventricle, a word that means a hollow area in an organ and is often associated with the heart, and the suffix -cide, which denotes the act of killing.
	+ This has been confirmed by Edmund when he said it means something like "the killing of the heart". This is in theme with other similar boss tracks such as Matricide, Hericide, and Infanticide.[*citation needed*]
V1.06.0180

*This was the first initial version of the Afterbirth † DLC expansion. For an overview on content added in Afterbirth †, please see this page: The Binding of Isaac: Afterbirth †*

## Undocumented changes

### Additions

* Added the following items to the Golden Chest pool:
	+ .

### Fixes

* Spiked chests will now correctly damage you on Chest and Dark Room.
* Charge items now correctly work with transformations.
Zodiac

### Collection Grid

*(page 4, column 7, row 2)**(page 4, column 7, row 2)**(page 4, column 8, row 2)*

### Unlock Method

 Defeat Ultra Greed as  The Lost

*For a list of all zodiac signs, see Signs of the Zodiac.*

**Zodiac** is an unlockable passive item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Gives Isaac a random Zodiac item effect that changes each floor.

## Notes

* Getting ,  and  does not grant Coins, Bombs, Keys or Soul Hearts.
* Getting  will not change Isaac's size.
* If already in possession of the item given by Zodiac, most have no effect. The only exceptions are  giving an additional +0.5 damage, and  giving another familiar.
* Getting  does not provide the  effect for the floor it is obtained. It does grant the chance to trigger a protective shield on taking damage however.

## Trivia

* This item's appearance is a reference to the Zodiac Killer, who used the symbol as his signature.
* This item's icon used to share the almost same icon as  but white instead of red.
V1.06.0182

## Documented changes

### Fixes

* Fixed a Windows crash caused by an exe modification step in the build process.
* Fixed a crash related to loading a game save after smelting trinkets.
* Fixed a crash on startup related to save data.
* Fixed a crash involving an item that would try to spawn doors in Greed/Greedier mode.
* Fixed a bug where the player could be hurt by certain fires spawned by their own items.
* Fixed a bug where the boss clear music could play too soon.
* Adjusted steam cloud save detection.

### Mod tools

* Fixed a display issue and some default path issues with room editor.
* Fixed a Mac issue with missing libraries that made the Mac ModUploader impossible to launch without a specific dev environment installed.

### Modding API

* Generated comments for HTML documentation.
* Added descriptions of mod callback conditions, arguments and return values, in `enums.lua` and in HTML documentation.
* Changed signature of `MC_EVALUATE_CACHE` callback to pass the player entity.
* Removed some duplicated casts: `Isaac.ToPickup` and `Isaac.ToEffect`. Instead use `entity:ToPickup` and `entity:ToEffect`.
* Added some missing entity casts: `ToBomb`, `ToLaser`, `ToKnife`.
* Added some methods to player to get joystick inputs.
* Made player stats modifiable by mods.
* Removed getters for readonly player stats, since they were made redundant.
* Added functions such as `Isaac.WorldToScreenPosition` to convert game coordinates to rendering coordinates.

## Undocumented changes

### Additions

* Mimic Chests have a new texture.
	+ They also now have a custom animation. (This does not get correctly unpacked by the unpacker and shows up as `8d6fafc0341b7397` in the root of the game directory.)
* Drowned Hive was given a new "portrait" attribute (might be related to the bestiary).

### Changes

* HP changes:
	+ Portal 10 → 9.
	+ Sisters Vis 800 → 500.
	+ Big Horn 600 → 480.
	+ Small Hole 10 → 10,000.
	+ Big Hole 10 → 10,000.
* The following bosses got updated animations:
	+ Sisters Vis,
	+ Big Horn,
	+ Delirium.
		- Added a random heart, a random bomb, a random coin, a random pill, and a random key to the Treasure Room without a pedestal item.
	+ Basement/Cellar:
		- Lots of room changes, too many to list individually.
	+ Womb:
		- Deleted room 741 (a room with 8 Blastocysts).
* If you  a 1-use item such as , it will still trigger the item, but it will no longer permanently store that item.
* The black champion Brownie now spawns Chargers instead of Drowned Chargers.
V1.9.3 (Beta)

### Links

None

The online beta received a patch on December 8th, 2023, announced on Twitter.

## Documented Changes

* Fixed unrecognized controller softlock
* Fixed false report mods as being active
* Create new match if all run results in-progress
* Small delay to active item after boss intro
* Caps lock works in text chat
* Profanity filter tweaked
V1.06.0076

* Modified room #717 on the Basement/Cellar so that Mulligans no longer spawn next to the entrances. (Mulligans have a chance to randomly explode upon room loading. If this occurred before the patch, it was guaranteed damage to the player.)
* Removed the top entrances from Devil room #11 and #14. (These are the rooms with Nulls and an Imp, which also happen to spawn at the top of the room, which causes near-guaranteed damage to the player.)
* Reworked sacrifice rooms.
* , , , and  now all counts towards the Beelzebub transformation.
* now scales with Isaac's damage.
* Curse of the Tower no longer activates if you are damaged by a troll bomb spawned by Curse of the Tower.
* The window for using  to steal Devil Room items is much smaller.
* 's damage has been buffed and now targets enemies specifically.

### Fixes

* Fixed the bug where players who completed the 1001% achievement before the release of v1.06.0067 were unable to get the achievement.
* Fixed  bug where it was impossible to get a full overcharge on an activated item from clearing rooms.
* Fixed the bug where it was possible to respawn an Angel Room statue by reloading the room with  (or quitting and continuing).
* Fixed the bug where it was possible to quit and continue from a Boss Rush in order to quickly complete it.
* now works in Greed mode as expected.
* Picking up  will now properly update Isaac's tear color.

(You can find technical details of afterbirth.a file changes here.)

## New bugs

* , , and  function as if the player has spectral tears. (Visually, the items will appear to be functioning normally, but this isn't the case.)
* The  and  synergy causes enemies to drop black hearts as if they were killed by .
* If you pick up  after picking up , you still erroneously retain the +40 damage boost from  and the increased tear delay. After the damage stat is refreshed (by picking up another damage item), this bug goes away.
* With a controller attached, it is possible to move Isaac when the game is out of focus and get him across loading zones and spikes without taking any damage.

## References

1. ↑ https://www.reddit.com/r/bindingofisaac/comments/3why73/bombfree\_method\_of\_getting\_into\_black\_market/