recursal/Fanatic-Fandom huggingface dataset:
MemBrain

### Found In

**MemBrains** are much larger Brains that slowly move around the room and occasionally hop to fire 8 blood shots in all directions. They have a large amount of health and will split into two Brains upon death. Membrains deal a whole heart of damage with contact and projectiles.

## Variants

### Stage HP

 62
 0

### Found In

Chance to replace MemBrains

**Mama Guts** are large versions of the regular Guts. They slowly move around the room, occasionally hopping and firing 8 large blood shots in all directions. Upon death, it splits into 2 Guts.

### Stage HP

 62
 0

### Found In

**Dead Meats** are bigger versions of the Cysts that move around the room slowly, occasionally hopping which fires 8 large blood shots in all directions that bounce off the walls like . Upon death, they split into 2 Cysts.

### Stage HP

 62
 0

### Found In

**Dingas** are large Dips that behave similarly to MemBrains. Dingas slide around the room aimlessly and occasionally hop, spawning Dips or shooting poop shots in 8 directions. Splits into two Squirts when killed.

### Stage HP

 20
 0

### Found In

**Mega Clotties** slowly move around the room, occasionally hopping. When one hops, it will usually fire six blood shots around itself, but it can also alternatively leave a puddle of Red Creep near itself. Even more rarely, the hop may spawn a Clotty or a collapsed Globin. Upon death, it’ll split into two Clotties. Even though the sprite shows three conjoined Clotties, it always creates two upon death, and will never spawn three.

## Gallery

* Sketches of monsters for the Binding of Isaac: Rebirth, including the Dinga in the third rectangle of the fourth row, formerly called "Guts Alt."

## Notes

* All monsters listed on this page deal one whole heart of contact damage except for Mega Clotty which deals half a heart of contact damage.

## Trivia

* MemBrain is a pun on the word membrane, which means a thin, flexible layer of body tissue.
* Mama Guts slightly resembles a digestive system.
* The Mega Clotty’s behavior coincidentally bears some resemblance to a fan idea of a boss called “Mega Clotty,” as, besides its name, this 2012 idea mentions that its behavior would be jumping up to shoot out blood shots as well as spawning one Clotty. However, the Mega Clotty is implemented as an enemy, not a boss, and some of its conceptual behaviors on the ideas wiki were never implemented for the fact that it’s purely coincidental.
Judas' Tongue

**Judas' Tongue** is an unlockable trinket.

## Effects

* Items in the Devil Room only cost 1 heart container.

## Notes

* Soul heart trades still cost 3 Soul Hearts, rendering this item useless for characters that can only have soul, black or bone hearts.
	+ An exception can be made for  ??? as the tongue reduces devil deal prices as normal.
* Judas' Tongue can retroactively change the price of devil deals.

## Interactions

* / : The tongue provides no discounts for any item costing money.
Luna

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

## Effects

* Adds an extra Secret Room and Super Secret Room to each floor.
* Reveals one random Secret Room on the map on pickup and at the start of each floor.
* Each newly discovered Secret Room has a shining beam of light that will raise tears for the current floor and gives Isaac a Half Soul Heart when walked under.
	+ The first light gives Isaac +1 tears fired per second, and all subsequent ones give +0.5 tears fired per second.
	+ This gives a potential +2.5 tears per second for a given floor, on top of 2 soul hearts.
	+ The tears up breaks the default 5 tears per second cap.
* Once the effect is triggered for the floor, a silver-bluish shine will appear around Isaac. This light will be strengthened for every beam of light "gathered".
	+ While this effect is mostly cosmetic, it also partially counteracts both the Curse of Darkness and the "dark rooms" in the Mines/Ashpit.

## Notes

* The beams of light appear in both Secret Room types but not in Ultra Secret Rooms.
	+ The beams of light also appear in Secret Rooms and Super Secret Rooms that appear as a result of .
* The beams of light appear even in unopened Secret Rooms on the same floor the item was acquired on.
* The effect can also be obtained in the Mirrored World.
* The tears up bonuses still apply while in the special area of Mines/Ashpit II.
* No new Secret Rooms are added in Greed Mode or Chapter 1 (if it's a starting item for  Eden), but the beam of light is still added to current Secret Rooms.
* No new Secret Rooms are added in ???, The Ascent, or Home.
* If kept after using  with  Tainted Eden, upon taking damage, the additional tear rate is lost. More beams of light will have to be found or used for the tears to be regained (assuming not all of them were used).
* If playing Co-op or as  Jacob and Esau, characters that did not pick up Luna will still gain full benefit from stepping within the beam of light. However, this will only benefit one character.
* Multiple copies of Luna will not cause additional Secret Rooms or Super Secret Rooms to be generated.

## Synergies

* : Opens every Secret Room generated for free, allowing for the maximum tear bonus every floor.

## Interactions

* : The effects stack, spawning three Secret Rooms on the floor. All three Secret Rooms will contain beams of light.
* : If Glowing Hourglass is used while Isaac touches the beam of light but before the animation where he raises Luna above his head is complete, the bonuses will be granted after time is rewound, allowing the same beam of light to be used multiple times.

## Trivia

* Luna originates from the *Antibirth* mod. In *Antibirth*, Luna's effect only provided extra Secret and Super Secret rooms.
* "Luna" is the word for "moon" in Latin and some of its descendant languages, and is sometimes used to distinguish the Earth's Moon from other natural satellites.

## Gallery

* Isaac as he appears when a beam of light triggers Luna.
Meat Cleaver

**Meat Cleaver** is an unlockable activated item added in *The Binding of Isaac: Repentance*.

## Effects

* Upon use, splits enemies in the room into two smaller versions with ~40% health each.
	+ Normal enemies can be split twice, while champions and bosses can be split three times. If an enemy cannot be split, they instead take 25 damage.
	+ If the enemy splits as part of their mechanic, such as Squirt, Teratoma, or The Fallen, they will instead take the damage required to split them.
	+ If the enemy has segments, such as Larry Jr. or Buttlickers, they will have their segments cut down to half, rounding down. There are several exceptions listed in the notes section.
	+ If the enemy has a cable between them, such as Mr. Maw, it will immediately be cut. Mr. Maws specifically will be left with just their head.

## Notes

* Invincible enemies, such as Stone Grimaces and lowered Hosts, will not be split.
* Multi-segmented enemies will only take damage on one segment.
* Pin, Mom's Heart, It Lives, Isaac, Satan, ???, The Lamb, Mega Satan, Hush, Ultra Greed, Mother, Dogma, Ultra Famine, Ultra Pestilence, Ultra War, Ultra Death, and The Beast cannot be split.
* Unlike other enemies, Delirium has no limit on how many times it can be split with Meat Cleaver.
	+ If used enough times, Delirium will die.
* Gemini will immediately separate in two, resulting in Suture being enraged even if no damage has been dealt otherwise.
* Using it on Loki will turn him into Lokii.
* Using it on Grubs will instantly kill them.
* Using it on Carrion Queen, Chub, or C.H.A.D. will split them into two one-segmented pieces, instantly killing both halves.
* Using it on Gabriel or Uriel will cause them to drop  and  (killing them both without picking up a key piece can result in getting the same key piece twice).
* Using it on The Horny Boys will turn them into Loki and Hornfel. Hornfel will be in his "fleeing" state, but will never exit the room and will only drop extra rewards if Loki is killed first.

## Synergies

* : Spawns one red wisp on the middle ring on use. Before spawning wisps, Meat Cleaver divides all of Isaac's wisps into two wisps that deal half tear damage. Wisps will be destroyed if they try to divide a third time.
* : Each split angel will drop an item.
* : Each split enemy killed grants a damage boost.
* : Split enemies will allow the shield to activate and stack up more easily.

## Interactions

* : If Blood Puppy is angry, splits it into two copies. One copy can level up and be tamed like normal, but the other cannot level up and dies instead of being tamed.

## Trivia

* Meat Cleaver originated from the *Antibirth* mod.
* This item's pickup quote is a reference to the phrase "Slice and Dice", which means to cut or divide something into smaller parts.

## Bugs

If the first foot is killed instantly, the second foot may never drop, requiring a reset.
Mitre

**Mitre** is a passive item.

## Effects

* Grants a chance of converting any Red Heart pickups into Soul Hearts instead.
	+ 50% chance to convert Red Hearts into Soul Hearts.
	+ 33% chance to convert Red Hearts into Soul Hearts.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into an angel.

## Synergies

* ???,  Tainted ???,  Dark Judas,  Tainted Judas, and  Tainted Forgotten: Decreases the chances of useless red heart drops, which these characters can't pick up.
* Bethany: Sacrifices potential healing for more charges. Usefulness depends on active item.
* Eve/: Decreases the chance of useless red heart drops when trying to maintain the half a heart (full heart on Eve) of health required to keep Whore of Babylon's ability active.
* Keeper/ Tainted Keeper: Nearly useless, since all hearts are converted into blue flies anyway. Only use is contributing to the Seraphim transformation.
* Tainted Bethany: Sacrifices potential blood charges for more health. Overall, still a beneficial pickup.
* Tainted Magdalene: Due to the "in your face" gameplay of Tainted Maggy, soul hearts will not be as useful up until the later floors.

## Trivia

* The mitre is a bishop's ceremonial headdress.
* Prior to *Repentance*, Mitre's description was "You feel blessed".
Match Stick

This article is about **Match Stick**, not to be confused with Match Book.
**Match Stick** is a trinket.

## Effects

* Gives a 10% chance of changing the room drop reward to a Bomb.
* Gives a 33% chance of adding a bomb to the rewards from opening certain Chests, destroying Tinted Rocks, or certain Machines.
	+ Other than Tinted Rocks, these can only drop the bomb if they drop coins, hearts, Bombs, or Keys.
	+ This includes:
		- Chests
		- Locked Chests
		- Bomb Chests
		- Eternal Chests
		- Spiked Chests
		- Mimic Chests
		- Mega Chests
		- Haunted Chests
		- Tinted Rocks
		- Slot Machines
		- Fortune Telling Machines
		- Crane Games
		- Confessionals
		- Beggars
		- Devil Beggars
		- Key Masters
		- Bomb Bums
		- Battery Bums
	+ This excludes:
		- Red Chests
		- Old Chests
		- Wooden Chests
		- Mom's Chest
		- Blood Donation Machines
		- Shop Restock Machines
		- Mom's Dressing Table
		- The Donation Machine
		- Devil Beggars
		- Rotten Beggars
		- Hell Games

## Notes

* Match Stick is the only trinket that is able to replace the .
	+ Tick will *not* be removed if Isaac has multiple trinket slots through either  or .
* In addition to regular trinket drop sources, Match Stick may sometimes drop from TNT barrels.
	+ It is also dropped alongside 3 bombs from taking .

## Trivia

* The pickup quote is a reference to The Simpsons.
* This item is used in Challenge #9 (Demo Man).
* The Match Stick being able to replace the Tick is a reference to a common remedy for removing a tick from one's skin, which is putting a flame beside it until the tick disengages.
Lucky Toe

**Lucky Toe** is an unlockable trinket.

## Effects

* +1 Luck.
* Increases chances of getting a room clearing drop (independent of the luck stat).
* 33% chance to drop 1 additional Pickup when opening certain Chests, or destroying Tinted Rocks, certain Machines, and certain Beggars.
	+ Other than  Wooden Chests, these can only drop the additional pickup if they drop coins, hearts, Bombs, or Keys.
		- Wooden Chests can only drop the additional pickup if it drops pills, cards, or runes.
	+ This includes:
		- Chests
		- Locked Chests
		- Bomb Chests
		- Eternal Chests
		- Spiked Chests
		- Mimic Chests
		- Wooden Chests
		- Mega Chests
		- Haunted Chests
		- Tinted Rocks
		- Slot Machines
		- Fortune Telling Machines
		- Crane Games
		- Confessionals
		- Beggars
		- Devil Beggars
		- Key Masters
		- Bomb Bums
		- Battery Bums
	+ This excludes:
		- Red Chests
		- Old Chests
		- Mom's Chest
		- Blood Donation Machines
		- Shop Restock Machines
		- Mom's Dressing Table
		- The Donation Machine
		- Devil Beggars
		- Rotten Beggars
		- Hell Games

## Interactions

* : The extra luck-independent chance of room clearing drops from Lucky Foot applies only in a diminished form, unless at zero or negative luck. This bonus from Lucky Toe is still retained.
Mom (Disambiguation)

**Mom**, or **Mother**, may refer to:

## Bosses

* Mom, the boss fought at the end of Chapter 3, and the final boss of Epilogue.
* Mom's Heart, the boss fought at the end of Chapter 4, and the final boss of Endings 1-11.
* Mother, the boss fought at Corpse.

## Monsters

* Mom's Hand, an enemy fought at Chapter 3 and 4.
* Mom's Dead Hand, a skeletal and stronger version of Mom's Hand.
* Mother's Shadow, an enemy fought at Mines/Ashpit.

## Items

* , an activated item.
* , an active item.
* , a passive item.
* , an unlockable passive item.
* , a passive item.
* , a passive item.
* , a passive item.
* , an unlockable passive item.
* , an unlockable passive item.
* , a passive item.
* , an active item.
* , a passive item.
* , a passive item.
* , an unlockable passive item.
* , a passive item.
* , an unlockable passive item.
* , an unlockable activated item.
* , an unlockable activated item.

## Trinkets

* , a trinket.
* , a trinket.
* , a trinket.
* , an unlockable trinket.
* , an unlockable trinket.

## Transformations

* Yes Mother?, a transformation triggered when obtaining three Mom-related items.
Lust

Degraded Mini-Boss

**Lust** is a mini-boss and one of the Seven Deadly Sins.

## Behavior

* Lust chases Isaac around the room at a fast speed, attempting to do contact damage.
	+ She builds speed the longer she travels without turning and takes heavily reduced knockback from Isaac's tears.

Lust deals a whole heart of contact damage.

## Unlockable Achievements

* The Book of Sin - Defeat all 7 Deadly Sins.

## Notes

* Having high speed will make the fight much easier.
* Lust can drop even if Isaac already possesses it. Taking another copy of :
	+ results in a speed down with no benefit.
	+ does not affect Isaac.
	+ counts as two items towards the Spun transformation.

## Trivia

* Lust is confirmed to be female. [1]
* gives Isaac a lumpy appearance that looks similar to Lust's appearance.
* The Seven Deadly Sins that these mini-bosses are based upon are, in Christian teachings, a classification of vices from which all others are derived.
* Lust's sickly appearance and chance to drop  may be a reference to Sexually Transmitted Diseases.
* Lust is a personification of one of the Seven Deadly Sins. Lust is sexual immorality in all its forms. It is believed to lead to impulsivity, dullness in religious thinking, inconstancy, and worldliness — as well as violence and hatred towards God in more extreme forms.
Lil Gurdy

### Collection Grid

*(page 4, column 19, row 1)**(page 4, column 19, row 1)**(page 4, column 20, row 1)*

**Lil Gurdy** is a passive item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Spawns a familiar that can be launched in the direction the player is firing after a short charge-up period.
	+ At full charge, it initially deals 6 damage per tick or 90 damage per second, but quickly drops towards 0 the slower the familiar moves.
	+ No longer deals damage per tick, instead deals a fix amount of damage depending on charge level, at lowest being ~5 and at max being ~20.
* It bounces off walls multiple times, much like Gurdy Jr.
	+ It will also bounce off enemies.

## Trivia

* Although Lil Gurdy's right eye is missing when facing right, its left eye is missing instead when facing left.
* Despite being able to destroy poop, Lil Gurdy is not able to extinguish fires.
Mom's Shovel

**Mom's Shovel** is an activated item added in *The Binding of Isaac: Afterbirth † (Booster Pack #5)*.

It is obtained by collecting the  and the .

## Effects

* Upon activation, creates a trapdoor that leads to the next floor or to a Crawl Space, identical to .
* Using this on a dirt patch that appears in Grave Rooms in Dark Room will unlock  The Forgotten.
	+ Once the Forgotten is unlocked, digging into dirt patches will instead spawn a random type of Chest.

## Notes

* It is possible to unlock  The Forgotten even if  has not yet been unlocked by teleporting straight to the dark room via a Sacrifice Room.
* Does nothing when used on ???, Sheol, Cathedral, Dark Room (except in a Grave Room), Chest, The Void, or Home.
* Once Mom's Shovel is complete, the stomping caused by  stops.
* Unlike the Broken Shovel, Mom's Shovel will not disappear if it is left on a pedestal, and Isaac leaves and re-enters the room it was left in.
* Like , this item can be used to destroy rocks if used while Isaac is flying over a rock.
* This item can be obtained by using  on  without obtaining the Broken Shovels.
* The full Mom's Shovel can be found within the area of . Even without unlocking the item, it can be crafted with the  using 8 Bone Hearts, and its effect can potentially be activated by .

## Synergies

* : Creates two wisps on the middle ring: one looks like  The Forgotten, which has increased HP but does not fire tears, and the other looks like  The Soul, which fires tears that have a 10% chance of invoking  on enemies.

## Unlockable Achievements

* The Forgotten - It's complicated.

* Bone Heart - It's complicated.

## Gallery

* The dirt mound, as found in Dark Room.
* The dirt mound, opened with Mom's Shovel.

## Trivia

* This item could be a reference to Ending 20, where Isaac is found dead inside the chest being nothing but skeletal remains, and this item was what Mom used to bury Isaac underground.
	+ This is seen in The Forgotten Update trailer, where Mom is burying Isaac's remains, along with , and possibly other items he had with him.
Magic Mushroom

**Magic Mushroom** is a passive item.

## Effect

* Grants Isaac one Red Heart Container.
* +0.3 Damage.
* x1.5 damage multiplier.
* +5.25 Range.
* +2.5 Range.
* +0.3 Speed.
* +0.5 Tear Falling Speed.
* Restores all Health.
* Isaac grows in size.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a walking mushroom.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into Stompy.

## Notes

* This item can rarely drop from destroying mushrooms.
* The x1.5 damage multiplier does not stack with the x1.5 damage multiplier from , from the combination of  and , or itself (by using an item such as , for example). However, it will stack with any other multipliers, such as .

## Interactions

* : Both 1.5x damage multipliers stack as expected.
* Tainted Bethany: On pickup, grants 12 blood charges.

## Unlockable Achievements

* Huge Growth - Increase in size 5 times in a single run via , "One makes you larger" pills, , etc..

## Trivia

* Magic Mushroom does not give a Tears, Luck, or Shot Speed increase despite its quote saying 'All Stats Up!'.
* This item and its effects are a reference to the Super Mushroom from the *Super Mario Brothers* video game franchise.
* This item's sprite resembles to the mushroom species *Amanita muscaria*, fly agaric.
* 'Magic mushrooms' is a colloquial term for hallucinogenic mushrooms containing psilocybin. Fly agaric is hallucinogenic, although it does not contain psilocybin and is not considered a "magic mushroom".
* This item is one of only two ( five) in the game that work towards 2 transformations (  and  ). The other is  ( also: , , and ).
* This item shares a retro pickup sound effect with .
* Magic Mushroom, along with , and  is one of the few items that make a unique sound upon pickup.
Mom's Box

### Collection Grid

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

**Mom's Box** is an activated item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Increases luck by 1 and doubles the effects of certain trinkets while held. When used, drops a random trinket on the ground.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into his mother.

## Notes

* Most trinkets are not affected.  Of the 188 trinkets in Repentance, only 72 have a doubled effect.
* This effect stacks additively with  Golden Trinkets; holding one with Mom's Box will cause applicable trinkets to have triple the regular effect.
* Holding a second Mom's Box by using  only increases luck, the effects of trinkets are not affected further.

## Synergies

* : Spawns a normal wisp with no unique effect.
* Gulp! Pill /  / : Trinket effects are still doubled when permanently applied to Isaac.
* : Triggers the  effect whenever an activated item is used.
* : Increases the chance of red rooms spawning.
* : Prevents items with quality 0 from appearing.
* : Adds 4 Rosaries to all item pools. Upon picking up a Rosary, the effect will end.
* : Boss' health will be reduced by 30%. Having the Tick also be golden does not further decrease boss' health.
* /  / : In addition to the further stats increase, they have an increased effect on your tear trajectory.

## Interactions

* : Grants double the heart containers but only one of them is filled.
* : Passive effects of Mom's Box are lost if absorbed.

## No Effect

These trinkets are not affected by Mom's Box.

## Unlockable Achievements

* Mom's Contact - Obtain three Yes Mother? items in one run.

## Trivia

* The item description possibly is a reference to the film *Seven (1995)* where the climax of the film involves the protagonist asking the question over and over again "What's in the box?".
* The item strongly resembles the chest found in Mom's room in Home.
* This item is used in  Pica Run (challenge #41).
Debug Console/Lua Debug Snippets

A collection of Lua code snippets that can be run directly in the Debug Console to find out otherwise hidden details, leveraging the Modding API functionality.

To use these, simply copy the entire code block and paste it (with Control+V) with the Debug Console open.

```
l for _,v in pairs(Isaac.GetRoomEntities()) do print("Type "..v.Type.."."..v.Variant.."."..v.SubType..", size "..v.Size.." x ("..v.SizeMulti.X..", "..v.SizeMulti.Y..")") end
```

```
l for _,v in pairs(Isaac.GetRoomEntities()) do c=v:GetColor(); print(c.R..", "..c.G..", "..c.B.." ("..c.A..") + "..c.RO..", "..c.GO..", "..c.BO) end
```

```
l for _,v in pairs(Isaac.GetRoomEntities()) do f=v:ToFamiliar(); if f ~= nil then print(f.OrbitDistance.X.."/"..f.OrbitDistance.Y) end end
```

```
l local pos = 32; local room = Game():GetRoom(); room:SpawnGridEntity(pos, 14, 7, 1, 0); room:SpawnGridEntity(pos+1, 14, 8, 1, 0); room:SpawnGridEntity(pos+15, 14, 9, 1, 0); room:SpawnGridEntity(pos+16, 14, 10, 1, 0)

```
Kid's Drawing

**Kid's Drawing** is an unlockable trinket added in *The Binding of Isaac: Repentance*.

## Effects

* While held, acts as one of the three items needed for .
	+ The effect is lost if Kid's Drawing is dropped.
	+ This includes instantly losing the transformation if dropping the trinket results in having only 2 out of 3 Guppy items required for the transformation.

## Notes

* If multiple copies of the trinket are obtained, they will each count as a Guppy item.
* The  Golden Trinket will count as holding 2 Guppy items.

## Interactions

* : No effect.
	+ Mom's Box +  Golden Trinket: Will still only count as holding 2 Guppy items.

## Trivia

* Unlike  items, this trinket doesn't have the "Guppy" tag (in items\_metadata.xml) and seems to be hard-coded to count toward the total. This may have to do with how trinkets in general, with or without an applicable tag, don't count toward transformations or unlock requirements.
Mini-Boss Room

The **Mini-Boss Room** is a Special Room in which Isaac battles against one of a number of mini-bosses, namely the Seven Deadly Sins, their Super variants, and Ultra Pride.  The Super Sins cannot be encountered in Basement or its variants; they only appear in Mini-Boss Rooms starting from Caves and beyond. If a Red Room created by  (etc.) is a Mini-Boss Room, all Sins and their variants, as well as Krampus, can be found within, even in the Basement.

As opposed to most other Special Rooms, Isaac can't tell this type of room from the appearance of the door without items that reveal this information, like  or , making the encounter a surprise. Once entered, all doors will be barred with two horizontal wood planks and metal, making it impossible to escape by blasting them open with bombs.

It has three properties that are shared with many special rooms:

* Not every floor contains a Mini-Boss Room.
* No floor may contain more than one.
* It is always a dead end, except for a fight against Greed or Super Greed in a Secret Room.

Standard Mini-Boss Rooms can spawn on any floor up to Chapter 5. In Chapter 6, Mini-Boss Rooms do not appear except for Greed or Super Greed in the Secret Room. However, mini-bosses are frequently encountered as regular enemies.

## Notes

* A door leading to a Mini-Boss Room cannot be bombed open.
	+ Using  or a  can open the door.
Match Book

### Collection Grid

*(page 4, column 9, row 4)**(page 3, column 19, row 5)**(page 3, column 20, row 5)*

This article is about **Match Book**, not to be confused with Match Stick.
**Match Book** is a passive item.

## Effects

* Grants Isaac one Black Heart.
* Spawns three Bombs near Isaac.
	+ Outside of Greed Mode, it will drop the  if it hasn't yet been encountered.

## Synergies

* : Black Feather grants a damage boost for Match Book.

## Notes

* It's advised to pay attention when picking up this item. The bombs that it spawns, like every other bomb pickup, has a chance to be replaced by a Troll Bomb.
Key Bum

### Collection Grid

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

### Unlock Method

 Defeat Ultra Greed as  Lazarus

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

## Effects

* Spawns a familiar that follows Isaac around and collects Keys, dropping random Chests in return.
	+ Spawns almost exclusively Chests, Red Chests, and Locked Chests, with a very slim chance to spawn another type of chest or a Grab Bag.
* This item belongs to the  set. Collecting three items from this set will transform Isaac's bums into Super Bum.

## Notes

* Key Bum will not pick up Golden Keys.
* Key Bum will pick up Charged Key without additional benefit.
	+ Key Bum will leave a Lil' Battery behind when picking up Charged Key.
* From a scoring perspective, Keys that Key Bum picks up count towards your Schwag bonus on daily runs.
* Key Bum does not join the line of familiars that follow behind Isaac.

## Synergies

* : Familiar is bigger and drops chests more often.
* : Chests frequently contain pennies, which have a chance of spawning more keys for Key Bum to pick up, possibly lead to a loop.
* / : Works as expected.
* : Allows Isaac to choose which Locked Chests are worth opening and which to pass, thus saving keys. Great for min-maxing.

## Trivia

* This item is the Key Master counterpart of  and .
Key Piece 1

**Key Piece 1** is an unlockable passive item.

## Effect

* Combined with , unlocks the golden gate in the starting room of Chest and Dark Room to fight Mega Satan.
* Increases the chance of finding an Angel Room.
* Grants a 2.5% chance of converting Red Heart pickups into Eternal Hearts.
	+ This effect stacks with .

## Notes

* This item is a guaranteed drop from Uriel if not already in possession.
* The Golden Gate can alternatively be opened using , , , , , or .
* This item, along with , can be rerolled into any item from the Angel Room pool.
* This item also counts as a familiar, meaning it takes up a familiar slot.
* Unlocking the Golden Gate with the combined key pieces and then restarting the floor with  or an I AM ERROR room will waste the key, which will not respawn.
* Will not be rerolled by , , or Dice Room effects.
* Will not be doubled by
* Picking up two copies with  will not double its Eternal Heart effect.
* Familiars that follow behind Isaac have a certain priority in how close their position is to him over other familiars, with Key Piece 1 having the lowest priority at 6th and thus being farther from Isaac than familiars of different priorities.

## Unlockable achievements

* Dad's Key - Pick up both Key Pieces from the Angels in one run.

* The Family Man - Pick up both Key Pieces from the Angels in one run.

* Filigree Feather - Acquire both  and .

## Trivia

* This item is used in  I RULE! (challenge #26) and  Ultra Hard (challenge #34).
Mom's Razor

This article is about the passive item. For other uses, see Mom (Disambiguation).
**Mom's Razor** is a passive item added in *The Binding of Isaac: Afterbirth †*.

## Effects

* Grants a razor familiar that orbits Isaac. Enemies that touch the razor take damage equal to 20% of Isaac's tear damage per tick or 300% of Isaac's damage per second ( 150% of Isaac's damage per second) and start to bleed.
	+ Bleeding enemies take damage equal to 10% of their maximum health every 5 seconds. Bosses cannot bleed and won't take any damage from the razor.
	+ Bleeding enemies take damage based on how quickly they move; the faster the enemy, the more damage they take. While moving, a bleeding enemy leaves behind red creep that can damage other enemies. Bosses can bleed as well.
	+ The razor does not block enemy shots.
	+ The razor blocks enemy shots.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into his mother.

## Notes

* It may not always be a good idea to take Mom's Razor if Isaac has one or more Pretty Flies as orbitals, as Mom's Razor can override Pretty Flies without giving protection from enemy shots.

## Synergies

* : Increases razor's size and contact damage. No damage increase on bleed effect.
Mom's Perfume

**Mom's Perfume** is a passive item.

## Effects

* Adds a chance to shoot fear tears, causing enemies to run away from the player.
* -1 tear delay (increased rate of fire)
	+ Since this directly affects tear delay instead of changing the tears stat, it allows Isaac's rate of fire to go over the normal maximum rate.
	+ Tear delay decreases are more noticeable and are a greater increase to DPS when the tears stat is high.
* +0.5 fire rate.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into his mother.

## Notes

* Fear tear effect depends on the luck stat, and the formula used to determine the chance is:

15

100
−

⌊

L
u
c
k

⌋

{\displaystyle \frac{15}{100 - \left \lfloor \mathit{Luck} \right \rfloor}}

	+ At base luck (0), the chance is 15%, maxing out at 100% at 85 luck.
	+ is significantly better at inflicting fear than Mom's Perfume.

## Synergies

* ///: If the main tear causes fear, the split tears cause fear too.
* : Finger can also apply the fear effect.
* : If a fear tear is fed, all burst tears cause fear. If a normal tear is fed, the burst tears cannot cause fear.
* : The tear flickers yellow, capable of inflicting fear when it does.

## Interactions

* : The chance to inflict fear does not stack.
* **Mom's Perfume**: Tear delay down does not stack.

## Gallery

* Rebirth item concepts, including Mom's Perfume.
Maggy's Faith

**Maggy's Faith** is an unlockable trinket.

## Effects

* Gives an Eternal Heart at the start of every floor.

## Notes

* The eternal heart is added directly to Isaac's heart containers, as opposed to appearing as a pickup.
* The effect will also be triggered when the floor is reset (for example, with ).
* Eden will not be given the eternal heart on the first floor if they start with this trinket.
* When held as  The Forgotten, the eternal heart will be given to whichever character is being controlled when entering the next floor.
* When going though the Ascent, eternal hearts will be given for each floor traveled up.

## Synergies

* : Eternal hearts will persist if the item is immediately used on the next floor, allowing for another eternal heart for free.
* Golden Trinket//: Each effect/trinket copy stacks granting one additional eternal heart at the start of every floor per stack with every pair of eternal hearts granted immediately giving Isaac a heart container.

## Trivia

* Maggy's Faith is most likely a reference to Mary Magdalene's faith in Jesus. Mary was said to be one Jesus trusted most and she stayed with Him past the abandonment of His disciples, as well as being the first person He showed Himself to after His resurrection.
	+ It may also be a reference to Mom, with her name being revealed to be Maggy during the Ascent sequence.
* "Faith's reward" may constitute a contraction of the adage "Faith is its own reward", although use of the word 'faith' in the game is conflicted, as it also used in the quote for the , in reference to Angel Rooms.
* This trinket is used in Baptism by Fire (challenge #38).

## References

1. ↑ http://www.smithsonianmag.com/history/who-was-mary-magdalene-119565482/?no-ist
Lil Larva

**Lil Larva** is a trinket added in *The Binding of Isaac: Afterbirth*.

## Effect

* Spawns one Blue Fly from every Poop Isaac destroys.

## Synergies

* : Grants one additional blue fly from destroyed poops per stack.
* : Each effect/trinket copy stacks granting one additional blue fly from destroyed poops per stack.
	+ The  Golden Trinket effect also adds to this stack.

## Gallery

* Lil Larva's original appearance before Booster Pack #5.
Mega Mush

**Mega Mush** is an unlockable activated item added in *The Binding of Isaac: Repentance*.

## Effects

* Gigantifies Isaac for 30 seconds, persisting between rooms and floors. While Gigantic, Isaac gains the following effects;
	+ Gains a 4x damage multiplier, +2 range, and loses -1.9 tears.
	+ Cannot take damage for the duration of the effect.
	+ Can destroy objects, Obstacles, and Pitfalls without falling into them and open doors by walking into them. This includes metal blocks and key blocks without using keys.
		- Does not open challenge room doors or doors that require keys if you lack the keys.
	+ Deals extremely heavy contact damage to enemies (80 per tick, or 1,600 per second).
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a walking mushroom.

## Notes

* Using Mega Mush again while its effects are still active will add an additional 30 seconds to the current active time.
* Isaac's physical size, i.e. collision circle or "hitbox" is roughly doubled in radius when Mega Mush is active. This is the only item that can make Isaac tangibly larger than his starting size, as normal size ups can't increase the collision area beyond the default.
* Mega Mush will not negate the damage taken from the Mausoleum door. It's even possible to die this way, while the item is active.
* Non-tear based attacks such as  or  are overridden by normal tears while Mega Mush is active.
	+ The only exceptions are the melee attacks by  The Forgotten,  Tainted Samson and , which have absolutely massive hitboxes.
* Isaac is unable to use the invulnerability effect to donate to Blood Donation Machines and Devil Beggars, since they will be destroyed on contact. Even Bomb Bums can be destroyed by walking over them.
* Mega Mush can be obtained by using  on .

## Synergies

* : The contact damage dealt by Mega Mush will allow it to be recharged and used multiple times in the same room.
* : Mega Mush's active time will be doubled to 60 seconds.
* : Retains massive damage increase after Mega Mush's timer is up, though can make it nearly impossible to raise it afterwards without another use.
* : Enemies killed with contact damage will frequently drop hearts.

## Trivia

* **Mega Mush** is based off of the Mega Mushroom from *New Super Mario Bros.*, which would turn Mario giant, grant invulnerability, and allow him to defeat almost anything he touches.
* Originally in *Antibirth*, the item didn't gain charges while active, and was unlocked by defeating Mother (then known as The Witness) as every character on Hard Mode.
* Entering the Big chest in Mega Mush form triggers the credits 0.5 seconds faster than normal (tested by entering the Big Chest going from the same position to the beginning of credits and timed with scripts)
* The Mega Mush form makes Isaac's face look similar to Flash Isaac
Lost Soul

*For the trinket with a similar name, see Found Soul. For another trinket with a similar name, see Your Soul.*
**Lost Soul** is an unlockable passive item added in *The Binding of Isaac: Repentance*.

## Effects

* Creates a ghostly familiar that closely follows behind Isaac. It dies in one hit, respawning at the start of the next floor.
* If Lost Soul survives until the start of the next floor, it rewards Isaac with one of the following:
	+ 3 Soul Hearts.
	+ 2 Eternal Hearts.
	+ A Treasure Room item or an Angel Room item.

## Notes

* Lost Soul hides behind Isaac's back, so shooting left will cause Lost Soul to be on your right side and vice versa.
	+ Also, if Isaac is moving right but shooting left, then his hitbox will completely absorb lost souls hitbox, making it significantly harder for enemies to hit it.
* Floors completed during the Ascent count.
* Waiting until after the floor is cleared before picking up Lost Soul nearly guarantees a reward payout on the next floor.
* The ghost can take explosive damage from Isaac, e.g. via placing a Bomb.
* Lost Soul's position behind Isaac can overlap with other Familiars.
* Leaving the Mother's Shadow chase sequence respawns Lost Soul.
* Swapping the item as  Tainted Isaac and picking it up again respawns Lost Soul.
* Spiked Rocks will kill Lost Soul.
* Lost Soul can die if it touches projectiles generated by friendly enemies (spawned from , for example).

## Synergies

* : Gives Lost Soul a once-per-room shield, similar to .
	+ If BFFS! is dropped, the shield will still remain active until taking one hit of damage, acting similarly to .
* /: Restarting a floor/run causes Lost Soul to give a reward if it's alive when used.

## Interactions

* : Cannot duplicate the ghost and won't spawn a , even when the ghost is dead.
* / : Does not provide immunity to contact damage from spiders/flies to Lost Soul.
* : Items dropped by Lost Soul are drawn from a random pool.
* /////: No effect.
* / : Picking up multiple Lost Souls has no effect, even if one died previously.
* : If a new floor is entered and  rerolls into this item, it will immediately give a reward.
* Tainted Forgotten: The ghost follows  Tainted Forgotten, making it very difficult to protect.

## Trivia

* Lost Soul originates from the *Antibirth* mod. In *Antibirth*, multiple copies of the item would grant multiple familiars.
Milk!

### Collection Grid

*(page 4, column 11, row 4)**(page 4, column 11, row 4)**(page 4, column 12, row 4)*

**Milk!** is a passive item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Spawns a glass familiar that follows Isaac and spills on the floor upon taking damage.
* When the milk spills, Isaac receives -2 tear delay ( +1.0 fire rate) (increased rate of fire) until leaving the room.
	+ Direct tear delay reduction can break the normal soft fire rate cap.
* The milk puddle is purely visual, and will stay on the ground for a few seconds before disappearing. The familiar will reappear in the next room.

## Notes

* Familiars that follow behind Isaac have a certain priority in how close their position is to him over other familiars, with Milk! having the lowest priority at 6th and thus being farther from Isaac than familiars of different priorities.

## Synergies

* : The milk familiar is not duplicated; instead, tear delay decreases by 2 upon use even if the player has not taken damage in the current room.
	+ No extra tear delay is granted, neither before or after breaking.
* : If activated at least once, the increased rate of fire will always be active.

## Interactions

* : Familiar is bigger but no effect on tear delay.

## Trivia

* This item is a reference to the phrase "Don't cry over spilled milk".
Locust of Conquest

**Locust of Conquest** is an unlockable trinket added in *The Binding of Isaac: Afterbirth †*.

## Effects

* Upon entering a room with enemies, spawns 1-4 White Locusts that deal double Isaac's damage.

## Notes

* The Locusts will also spawn each time a wave starts in Boss Rush.
* The Locust will not spawn each time a wave starts in Greed Mode.
Krampus

**Krampus** is a mini-boss that can occasionally appear inside of a Devil Room.

## Behavior

Krampus moves randomly around the room in cardinal directions and can perform the following attacks:

* Stops and fires  lasers in all 4 cardinal  or diagonal directions.
	+ The lasers can sometimes rotate 90 degrees in either direction after being shot.
		- Krampus signals rotating  lasers by growling and quickly dashing towards Isaac before performing this attack.
* Fires 3 projectiles in a spread followed by 4 projectiles in a spread in succession towards Isaac.

Krampus deals a whole heart of contact damage.

## Gallery

* Krampus in-game.
* Krampus as one of  Delirium's forms before Repentance.
* Krampus' appearance before Repentance.

## Notes

* Beating Krampus the first time will unlock .
* Encountering Krampus replaces both the statue of Satan as well as any deals in regular Devil Rooms.
* will not change the items dropped from Krampus.
* Rerolling  or  causes another Devil Room Pool item to appear.
* Krampus can never appear in the first Devil Room entered on a run.

## Trivia

* His name and appearance are based on Krampus, an alpine folkloric figure. It supposedly acts as a antithesis to Saint Nicholas, punishing children who misbehave near Christmas time.
	+ This is most likely why  is in his item pool.
* Krampus is both visually and behaviorally similar to The Fallen, but does not split upon death.
* Krampus can spawn in Greed Mode without needing to be unlocked.
	+ Defeating Krampus when encountered here still unlocks  even if Krampus himself has not yet been unlocked.
* In an AMA subreddit thread for Edmund McMillen, a user questioned why Krampus got "worse with every update." Edmund McMillen jokingly responded, "he's the new bloat."; referencing the general hatred some fans have towards The Bloat.
* Despite Krampus receiving a redesign in *Repentance*, Delirium's Krampus appearance has yet to be updated.
* Red Mini-Boss Rooms created by  (etc.) can contain a battle against Krampus.
* Krampus is tied with The Fallen as having the highest Stage HP among all entities in the game.
Lazy Worm

**Lazy Worm** is a trinket added in *The Binding of Isaac: Afterbirth*.

## Effects

* -0.5 shot speed.
* +4.0 range.
* +2.0 tear falling speed.

## Notes

* This trinket pairs well with Homing, as lower shot speed means better target tracking.

## Interactions

* : Tears will take longer to hit enemies, increasing the damage dealt by the aura.
* : Decreased shot speed makes it harder to keep the tear on enemies.
* : Because Trisagion can hit the same enemy multiple times, lower shot speed results in a substantial DPS increase.
* /  / : Decreases effective range.

## Gallery

* Lazy Worm's original appearance before Booster Pack #5.
Leprosy

**Leprosy** is an unlockable passive item added in *The Binding of Isaac: Afterbirth † (Booster Pack #2)*.

## Effects

* Upon taking damage, Isaac gains a body part as an orbital, which blocks enemy shots and deals 7 damage per tick (35 damage per second) to enemies it comes in contact with.
	+ A maximum of three body parts can be active at once.
	+ The body parts will be destroyed after dealing 30 ticks of damage and/or blocking 3 shots.
	+ The body parts persist between floors.
	+ Body parts orbit on the same layer as Blue Flies and Locusts do.

## Trivia

* The description "You're tearing me apart!" is a reference to the movie *The Room* (which Edmund has said he is a big fan of), in which Tommy Wiseau famously exclaims "*You're tearing me apart, Lisa!*".
* Leprosy was inspired by a Steam Workshop item by Bobby Lashley Fangirl #1.
* The item used to be misspelled "Leprocy" but was corrected in a later patch.
* The item is a reference to leprosy, a bacterial disease that damages nerves and can cause extremities to rot in extreme cases.

## Gallery

* The Forgotten has a unique appearance with Leprosy, making him look visually similar to Melting, a playable character from the game *Nuclear Throne*.
Mom's Toenail

## Effects

* Mom's foot periodically comes down, dealing 300 damage.
	+ The foot stomps every full minute (based on the in-game timer).
	+ The foot stomps every 20 seconds (based on the in-game timer).
	+ The foot also hurts Isaac for a full heart.
* This trinket counts towards the unlocking of  however it does not count towards the  set.

## Notes

* As the foot counts as an explosion, the damage can be avoided with  or .
* Unlike the foot spawned by  or , this foot doesn't target enemies nor Isaac.
* The impact can open doors, including Secret Room entrances.

## Interactions

* Golden Trinket//: Each effect/trinket copy lowers the time between stomps.
Keeper's Kin

**Keeper's Kin** is an unlockable passive item added in *The Binding of Isaac: Repentance*.

## Effects

* If Isaac is in a room with enemies, rocks and rock-like obstacles will occasionally spawn blue spiders.
* Causes all rocks to spawn 0-2 blue spiders when destroyed.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a humanoid spider.

## Synergies

* : Due to the high tendency of replacing rocks with TNT, it allows for easy destruction of nearby rocks, resulting in lots of blue spiders.
* / : As Isaac can break all reachable rocks, he can amass a lot of blue spiders.
Locust of Pestilence

**Locust of Pestilence** is an unlockable trinket added in *The Binding of Isaac: Afterbirth †*.

## Effects

* Upon entering a room with enemies, spawns a Green Locust that deals double Isaac's damage and poisons enemies, which deals double Isaac's damage over time.

## Notes

* The Locust will also spawn each time a wave starts in Boss Rush.
* The Locust will not spawn each time a wave starts in Greed Mode.
Lump

### Found In

**Lumps** remain stationary in one spot and shoot a spread of three shots towards Isaac when he comes within range, then they burrow underground and resurface in a different part of the room. If they resurface in range to shoot at Isaac, they will do so incredibly quickly before burrowing underground again.

Lumps will also burrow underground to reappear elsewhere if Isaac doesn't approach them for period.

### Notes

* When a Lump is a Green or Purple Champion, it can be seen teleporting around the room while burrowed.

## Variations

### Stage HP

 55
 0

### Found In

**Tar Boys** occasionally fire a short-ranged spray of shots towards Isaac that leaves behind slowing Black Creep. It can also burrow underground and resurface in a different part of the room, much like the Lump. However, it is only able to resurface in areas that have Black Creep and it will prefer to resurface close to Isaac.

If Isaac is standing on Black Creep, Tar Boys can  launch a fountain of tar shots straight upwards out of the Creep where Isaac is standing/ create a Nerve Ending-like tentacle directly underneath Isaac. This can also occur with Black Creep spawned by other enemies such as Gushes.

## Gallery

* Tar Boy's tentacle attack.
* Concept art for Tar Boy.

## Trivia

* Tar Boys were added in Booster Pack #4.
* Lumps had a radically different appearance in the original Binding of Isaac.
* Lumps are similar in appearance to the Betus enemies from one of Edmund McMillen's previous games, Super Meat Boy.
* Previously, Lumps appeared as Light Brown in the Scarred Womb. As of Booster Pack #5, Lumps are now red in this environment.
* Tar Boy is a reference to the Newgrounds animation of the same name.