recursal/Fanatic-Fandom huggingface dataset:
The Wafer

**The Wafer** is a passive item.

## Effects

* Most damage taken is reduced to half a heart.

## Notes

* The damage reduction includes most sources in the game that would cause more than half a heart of damage:
	+ Bombs.
	+ Most Champions.
		- The exceptions being the skull and large champions, they will deal a full heart damage even with The Wafer as opposed to only one half.
	+ Sacrifice Rooms.
	+ Environmental hazards such as Spikes.
	+ Most self-inflicting damage items (exceptions are noted).
	+ Every source of damage in Womb/Utero/Scarred Womb and beyond, including all enemies, Curse Rooms, Blood Donation Machines, and Devil Beggars.
	+ The "HARD HARD" special seed.
* The Wafer does not reduce damage from:
	+ Instant death effects, such as  or using  on the Satan boss fight.
	+ Devil Room deals or Health Down pills.
	+ No effect with  Keeper or   Tainted Keeper, as Coin Hearts cannot be half hearts.
	+ Does not reduce the damage taken when opening the door to Mausoleum/Gehenna.
* Despite The Wafer reducing damage to 1/2 a heart, this does not change the amount of invincibility frames granted from full/two heart damage sources.
* The Wafer is substantially less useful in Greed Mode, since Chapter 4 and beyond does not increase damage taken like usual.

## Interactions

* : Does not reduce the damage taken.
* : The extra damage taken when the cannon breaks is not reduced.
* : Damage taken is reduced to half a heart.
	+ Does not reduce the damage taken.

## Trivia

* In the original *The Binding of Isaac*, "resistance" in the pickup quote was misspelled as "*resistence*". This was corrected in Rebirth.
* A wafer is a thin cake made of flour and is used in Christianity for various purposes, including the sacrament of the Eucharist, in which believers consume the body (represented by sacramental bread) and blood (represented by sacramental wine) of Jesus Christ.
* In the original *The Binding of Isaac*, The Wafer required an unlock, by beating Mom's Heart seven times.
The Gate

Double Trouble

Degraded Boss
Main path

Alternate path

**The Gate** is a boss that can appear:

* In the Depths and Necropolis.
* In the Depths and the Dank Depths.

## Behavior

Like Mega Maw, The Gate is stationary and will perform the following attacks:

* Spawns a Leaper into the air. It can land anywhere in the room while releasing its projectile attack immediately.
	+ There is a maximum of 4 Leapers alive at once.
	+ The Gate cannot perform other attacks if there are no Leapers alive. As such, it will also always perform this attack first.
* Shoots a ring of 9 projectiles that can rotate in either direction while expanding outwards.
* Shoots two rings of 6 projectiles which expand outwards and rotate in opposite directions.
* Shoots a ring of 11 straight blood shots in all directions.
	+ The Gate's blood shots can damage its Lepers.
* If there are 2-3 Leapers alive, it charges up and fires a  laser that curves to connect to all leapers that are not off-screen.
	+ This kills the Leapers unless they are off-screen.
	+ If faced alongside other enemies or bosses, such as in Boss Rush, the laser connects to them, damaging them as well.

## Champion Versions

 **Black**: Has 25% more HP (625) and spawns Big Spiders instead of Leapers. The Big Spiders are tossed directly towards Isaac instead of landing randomly in the room, and can be damaged by The Gate's blood shots, like the Leapers. It does not perform the Brimstone attack.
 **Red**: Does not spawn any enemies and has a completely different set of attacks, including:
Fires 5 lines of 2-3 slow-moving homing purple shots.
Fires 8 lines of 9 blood shots that spiral outwards.
Fires 7 lines of 9 blood shots that pulsate outwards.
Fires 8 lines of 9 blood shots that move outwards in a zigzag pattern.
All the attacks of the Red version do 1 heart of damage.
## Gallery

* The Gate in-game.
* The Gate defeated.
* The Black Champion Gate.
* The Black Champion Gate defeated.
* The Red Champion Gate.
* The Red Champion Gate defeated.
* The Gate as one of  Delirium's forms.
* Concept art for what appears to be The Gate (known in this sketch as "Mega Maw 2"), along with Mega Maw and a scrapped Pin variant.

## Notes

* If The Gate is encountered in conjunction with other bosses, which can happen in Greed Mode and Boss Rush, the Brimstone laser will also hit the other bosses and enemies it spawns, damaging and possibly even killing them.
* Using the  to remove Leapers causes The Gate to be stuck attempting to spawn them infinitely, as it cannot perform other attacks without any Leapers alive.

## Trivia

* It is the posthumous version of Mega Maw.
	+ Despite being a posthumous version of Mega Maw, The Gate physically resembles a giant Host.
	+ It's also larger than Mega Maw.
* Upon death, a small Isaac head can be seen poking out of its corpse before it explodes.
	+ Two glowing white eyes can be seen in its mouth throughout the fight, which may also be the Isaac head.
	+ The Red Champion Gate's death animation reveals a small demon instead, whose glowing red eyes can also be seen in its mouth during the fight.
The Binding of Isaac: Four Souls

The Binding of Isaac: Four souls (or just "Four Souls") is the official TBoI card game. The game is for 2 players or more, and is about deceiving others, kill each other, looting, gaining items, and winning souls.

There is an official website here, which shows everything you need to know:

* *https://foursouls.com/*

## Winning

Just like the title of the game says, you need four souls to win, and gaining souls is usually by killing Bosses. But there are other ways to obtain souls. There will be bonus souls, that are tasks you need to do to gain those bonus souls. Another way is by gaining the 'lost soul' trinket, which is in the loot deck. An additional way to gain souls is through gaining some treasures, some treasures may give you souls, but there is only a couple of treasures that do. The final way of gaining a souls is by playing as the  The Lost.

## Treasures

Treasures, or items, are obtained by paying 10¢, if you gain it this way you may purchase a item from the shop, or from the top card of the treasure deck, which is risky. The shop starts with 2 items in it, and can be expanded with event cards, and other treasures.

## Loot

Loot cards are essential to play, since it gives you money, bombs, and other goods. This deck is where you can find 'Lost Soul'. At the start of your turn you always loot one.

## Monsters

Monster cards are things you can always attack. Monsters have hp, a dice roll you need to roll or higher, and damage. Monsters usually have a reward for killing it, like loot, money, treasures, and bosses always give a soul, or 2 souls! At the start of that game, there are 2 monster slots, and can be expanded by event cards, or sometimes treasures. There are many types of monsters, the most often cards from the monster deck is regular monsters, and boss monsters, but there are sometimes event cards which do special things, like skipping turns, gaining loot, and rarely a soul. Monsters sometimes have effect text like if you roll a 1 take double damage, or when this dies kill a player. Players only may attack once, and may attack the top deck of the monster deck for a gamble.

## Room Deck

The room deck is an optional deck you can play with, which gives players an extra challenge, and another thing to pay attention to. Every time a Monster dies, the active player may discard the current room deck. The room deck holds cards that helps every one, hurts only one person, and rarely a monster (there is only 1 monster out of all 50 cards)!
Turdlings

Double Trouble

(with the Gurglings)

(with Dangle)
Degraded Boss

**Turdlings** are a boss added in *The Binding of Isaac: Afterbirth* that can appear:

* Only in the Basement.
* In the Basement and the Burning Basement.

They each have 50 HP.

## Behavior

The Turdlings spawn as a pair and wander around the room. Each individual Turdling has one attack in total which is performed independently of the other:

* Rushes towards Isaac when aligned in any cardinal direction, leaving behind slippery Brown Creep until it has run into a wall.
	+ After rushing into a wall, it spawns 4 Brownie Corns that launch out in the cardinal directions.
	+ Occasionally, after rushing into a wall it will fart, knocking back Isaac and nearby Brownie Corns.
	+ Its dash can be interrupted if it runs into a Brownie Corn.

## Gallery

* A Turdling in-game.
* A Turdling as one of  Delirium's forms.

## Notes

* The Turdlings are much less common than their counterparts, spawning only 1/4th as often.

## Trivia

* They are a corny poop-themed variant of the Gurglings.
* The Turdlings and their regular variant, the Gurglings, spawn in groups of three during the Boss Rush.

## Seeds

PC SS34 ZJCL (The Basement XL, 1st boss)

PC Z2ZD A3PA (The Basement I, 1st boss)
The Body

### Collection Grid

*(page 4, column 9, row 3)**(page 3, column 9, row 5)**(page 3, column 10, row 5)*

### Unlock Method

 Defeat ??? as  The Lost

**The Body** is an unlockable passive item.

## Trivia

* This item, along with  and , are references to the Three Primes of Alchemy.
	+ The designs of these items appear to be that of Triquetra, a Christian symbol of the Trinity.
* The item's description, along with those of  and , are references to the three attributes commonly ascribed to God in Christian theology: omniscience, omnipotence, and omnipresence. For The Body, it is omnipresence, the ability to be everywhere, thus to "feel all".
* By itself (without other items/pickups), the Body grants the most amount of red heart container out of all items in the game, and is the only one that grants three Red Heart Containers.
The Ladder

**The Ladder** is a passive item.

## Effects

* Allows Isaac to walk across gaps one square across by automatically placing a ladder between the two walkable sections. Enemies can not walk over the ladder.

## Trivia

* This item is a reference to the Ladder in The Legend of Zelda for the NES.
* This item is used in  I RULE! (challenge #26).
* This item can be found as one of the Nintendo-themed Treasure Room items in the 6th of December's Daily Run, which is an homage to the late CEO of Nintendo, Satoru Iwata.
Tumor

### Found In

**Tumors** are enemies that slowly float across the room diagonally bouncing off walls. They occasionally fire 6 blood shots in all directions, and fire even more quickly when attacked.

## Variations

### Stage HP

 40
 0

### Found In

**Psy Tumors** behave exactly like regular Tumors, but fire homing shots instead of blood shots.

### Stage HP

 32
 0

### Found In

**Camillo Jr.** behave exactly like Tumors, but fire  lasers at Isaac. Their lasers may also hit enemies for 8 damage.

### Stage HP

 28
 4

### Found In

**Planetoids** are a variant of Tumor that move faster than their variants and, fire blood shots that orbit them, similar to effect of . When they take damage, they fire shots more frequently and have a chance to fart, releasing their orbiting projectiles out of orbit and let them fly off while starting a new ring.

### Stage HP

 20
 0

### Found In

**Poofers**, unlike other Tumors, slowly float towards Isaac. However, if Isaac is shooting, they will target a position in front of where he is facing instead of targeting him directly, to try and intercept his projectiles.

Each time they take damage, they swell up and fire 6 blood shots in a fixed, radial spread. They can swell up a total of 4 times, becoming slower the more swollen they are. Upon death, they explode, forcibly pushing Isaac, destroying nearby grids, healing nearby enemies for 15 HP, and leaving a large puddle of damaging Red Creep.

Their health also doesn't deplete until they are hit by a total of at least 40 damage, giving them an effective health of 60 and a unique form of one-shot protection.

## Gallery

* Fully Swollen Poofer.
* Unused pre-release sprite of Camillo Jr. found among the Room Editor files.
* Concept art for the Planetoid.

## Trivia

* Tumors are a reference to abnormal growth of tissues of the same name, caused by genetic mutations.
* Camillo Jr.'s name is a reference to Kracko Jr., a recurring enemy from the *Kirby* series. In appearance he bears resemblance to Kracko, the mature version of Kracko Jr.
* Poofer is a reference to the enemy from *The Legend of Bumbo* with the same name.
* A Planetoid is an astronomical object that is neither a planet nor a comet.
Twisted Pair

**Twisted Pair** is an unlockable passive item added in *The Binding of Isaac: Repentance*.

## Effects

* Spawns two demon familiars that float by Isaac's side, and fire tears that use Isaac's tears, range, shot speed, and tear effects, and scale with Isaac's damage.
	+ Each familiar deals damage equal to 0.375x Isaac's damage.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a three-faced version of himself.

## Notes

* Twisted Pair is very similar to the item . It provides the same total damage per second increase in the form of a familiar (familiars in this case).
* When playing as  Lilith or  Tainted Lilith, the demon familiars will deal 50% of Lilith's damage each.
* Holding the up/down + left/right attack buttons will make one demon go further behind and the other one in front of Isaac.
* Because the demons need time to adjust their position while firing, the left\right directional buttons can be tapped to shoot more precise, straight lines of tears.
* They don't inherit all effects and stats from the player. See item interactions below to see the small oversights.

## Synergies

* : Twisted Pair's tears deal twice as much damage.
* //: Each additional Twisted Pair will add two more familiars that float farther out from Isaac.
* : Increases the fire rate of Twisted Pair.
* : Twisted Pair's tears follow the beam.
* : Causes the Twisted Pair to orbit Isaac, allowing for a more precise firing of tears.

## Interactions

* : Each familiar will fire a missile from a two additional crosshairs. **Not Recommended**, as the twisted pair crosshairs are not synced to Isaac's crosshair and move at a much slower rate, making self damage much more likely as the additional crosshairs will struggle to make distance from Isaac. This is likely an oversight.
* : The familiars do not have the staggered attack, stat bonuses still apply.
* The two familiars will also fire coin tears which spend Isaac's coins. Their shot counter is independent from Isaac's.
* : While the soul is alive, decreases Twisted Pair's damage by 20%.
* : Only 1 item pedestal is spawned for their sacrifice, unless they were spawned through , in which case they will count for two.
* + /: While Terra + laser items like Brimstone or Technology don't open doors normally, Twisted Pair's lasers can open doors. This is likely an oversight.

## Trivia

* The name is a reference to Neil Breen's film of the same name.
Tropicamide

This article is about **Tropicamide**, similar in appearance to Eye Drops.
**Tropicamide** is a passive item added in *The Binding of Isaac: Repentance*.

## Effects

* +2.5 Range.
* +0.22 tear size.

## Interactions

* /  /  : No effect on projectile size.
* : Laser size is increased.
* : Tears fired will now act as if they have been fed one tear, meaning the tear will explode into 6 parts instead of 5 if undisturbed.

## Trivia

* Tropicamide is a medication used to dilate the pupils.
The Inner Eye

**The Inner Eye** is a passive item.

## Effects

* Isaac fires a spread of three tears at once.
* Tears down: (Delay \* 2.1) + 3
	+ Tears fired per second \* 0.51.

## Notes

* The maximum number of tears per volley that can be reached by combining and/or duplicating , The Inner Eye,  and  is 16, or 20 with  Keeper.

## Synergies

* : When Isaac uses Abyss to absorb The Inner Eye it creates three locusts instead of one.
* : At full charge, fires 3 rows of 4 tears, resulting in 12 tears.
	+ At full charge, fires 3 rows of 5 tears, resulting in 15 tears.
* / : Replaces the single missile strike with a barrage of three consecutive missiles.
* : Effects stack, resulting in 6 tears being shot with no further decrease in fire rate.
	+ Adds an additional tear with no further decrease in fire rate. This can be stacked up to 16 tears.
* : The tear gains two orbiting tears.
* : 3 knives are fired.
* : Tear rate is not lowered further. Damage is increased by a flat +5 instead of a normal Polyphemus boost.
	+ Damage is increased by a flat +5 instead of a normal Polyphemus boost. Decreases fire rate by a little.
* : All tears are fired along the beam, but some may be hard to see as they overlap each other.

## Interactions

* : Overridden by The Inner Eye.
	+ Shoots 5 tears with no further decrease in fire rate.
	+ Removes the fire rate penalty while reducing damage to 80%. Additional copies will add one additional tear with no further change to damage/fire rate.
* : Fires 3 beams. Affects Azazel's short-ranged **Brimstone** similarly.
* The Forgotten: Triples bones thrown and swung. Significant decrease in fire rate.
* Keeper: Fires 6 tears with significantly decreased fire rate.
	+ Fires 4 tears with significantly decreased fire rate.
* Tainted Keeper: Only fires 5 tears in the volley, while still gaining significantly decreased fire rate.
* : Increase number of tears in tear barrage; however, only fires one stone.
* : The barrage will activate as normal but Isaac will sometimes fire red tears.
* : Only occasionally fires one tear in the other three directions.
* : Only occasionally fires one tear out of the back of Isaac's head.
* : Overrides The Inner Eye.
	+ Shoots 7 tears instead of 3. No further decrease in fire rate.
		- Shoots 5 tears instead of 3. Decreases fire rate by a little.
* : Adds 5 tears to barrage with a significant decrease in fire rate.
* : Does not affect the number of tears when bombs explode.
* : The laser is not affected by The Inner Eye.
* : No effect on number of tears when taking damage.

## Trivia

* The Inner Eye is a reference to the concept of the 'third eye', an idea popular in Eastern mysticism dictating the existence of an invisible third eye usually located on a person's forehead which would allow them to see beyond normal reality.
* The eye on  ???'s head appears as an X, similar to this character's other eyes
The Small Rock

**The Small Rock** is an unlockable passive item.

## Effects

* +1 damage.
* -0.2 speed ( not applied until the next time Isaac's speed stat is updated).
	+ -0.2 maximum speed.
* +0.2 tears ( not applied until the next time Isaac's tears stat is updated).

## Notes

* Has a small chance to be dropped from a destroyed tinted rock.
* Normally only appears once per run, but can appear again if Isaac's items are re-rolled with , , or a Dice Room.
* Always has a chance to spawn as long as Isaac does not currently have it. This includes the possibility of spawning and obtaining multiple copies of The Small Rock on the same floor if not picked up the first time.
* Taking the rock in the Boss Rush from a tinted rock in the room will count as taking an item and consequently trigger Boss Rush. The other items do not disappear and will stay until one is picked up.

## Interactions

* /: Additional copies grant an additional tears up and speed down with no further increase in damage.

## Trivia

* In the original Binding of Isaac, the player's tears would take on a grey color after Small Rock has been picked up. In Rebirth, however, the tears will be red.
	+ However, before the Halloween Update, the player’s tears were blood tears. The reasoning for the change from blood to grey is unknown.
* This item is used in Head Trauma (challenge #3).
	+ Head Trauma is unlocked by default, despite the fact that Small Rock isn't. This item, ,  and  are the only items that appear in challenges before they are unlocked. Small Rock and TMTRAINER are also notable for not being unlocked by beating the challenge they appear in.
The Forsaken

Degraded Boss

**The Forsaken** is a boss added in *The Binding of Isaac: Afterbirth* that can appear:

* In all environments of Chapter 2 (Caves, Catacombs, Flooded Caves).
* Only in the Catacombs and the Flooded Caves.

## Behavior

* Spawns a Bony.
	+ While at least one Bony is still alive, the Forsaken becomes incorporeal and floats erratically around the room staying away from Isaac and very occasionally drifts towards Isaac attempting to pass through him.
	+ Every tear shot towards the Forsaken during this phase passes through it.
	+ When at around 30% HP, it spawns 2 Bonies instead.
* When all Bonies are killed, The Forsaken moves close to the center of the room before reappearing and firing 3  lasers in triangular directions with one laser always shooting in the opposite direction of Isaac. These lasers then rotate just over 180 degrees in either direction.
	+ Afterwards it stays vulnerable for a few moments before spawning another Bony and repeating the process.
* Unlike its counterparts, The Haunt and  The Heretic, The Forsaken does not deal contact damage while incorporeal. Rather, if Isaac walks through The Forsaken, it spawns another Bony, briefly becoming vulnerable while doing so.
	+ If this is repeated without killing any Bonies until there are 4 alive on-screen, the next time Isaac walks through The Forsaken, it performs a modified version of its  attack with greatly increased speed and duration, killing off all Bonies.

## Champion Versions

 **Black**: Spawns Black Bonies instead of regular Bonies. The Spinning Brimstone attack is replaced with The Forsaken spawning 4 Dank Death's Heads and resuming invincibility for 1 second if there are no other Dank Death's Heads alive. It can not spawn any Dank Death's Heads if there is at least 1 other alive and will instead remain vulnerable for a duration before spawning another Black Bony.
## Gallery

* The Forsaken in-game.
* The Forsaken performing its Brimstone attack.
* The Black Champion Forsaken.
* The Forsaken as one of  Delirium's forms.
* The design of what is presumably an early model of the Forsaken, along with those of other Afterbirth/Afterbirth † bosses, by Edmund McMillen.

## Notes

* The Forsaken can be instantly killed with  if it is at 50% health or below.

## Trivia

* It is the posthumous version of The Haunt.
* When The Forsaken disappears, it covers its eyesockets with its arm-like bones. This is most likely a reference to Boos from the *Mario* franchise.
* The Forsaken appears to be The Haunt without its ghostly exterior.
* During the versus screen, the Forsaken's Bony-spawning sound can be heard. The Forsaken is one of seven/ five bosses that can be heard during the versus screen, the other six/four being The Stain,  Big Horn, Mom,  Mom's Heart,  It Lives and  Mother.
* The Forsaken can be found in The Void, even before being unlocked.
* The Forsaken has an alternative resurrected variation known as the The Heretic.
The Battery

This article is about the item. For the pickup, see Batteries. For other uses, see Battery (Disambiguation).
**The Battery** is a passive item.

## Effects

* Activated items can store an extra level of charge, allowing them to be used twice in one room.
	+ Extra charges appear in yellow over the normal charge meter.

## Notes

* The Battery does not affect self-recharging activated items.
	+ Self-recharging active items can charge the yellow meter, allowing Isaac to use them twice immediately.
* Picking up a Lil' Battery while the held activated item's main charge bar isn't full will only fill the main charge bar without adding overcharge.
	+ If the recharge time of Isaac's held activated item is less than 6 and he picks up a Lil' Battery, it'll overcharge the item for the remaining charges left in the Lil' Battery.

## Synergies

* 48 Hour Energy pill: A fully discharged item will be doubly charged, along with spawning 1 or 2 Lil'Batteries.
* : Walking over a captured enemy will double charge the ball, allowing the enemy to be released, and allowing to catch a new one in the same room, and the process repeats. This allows the Friendly Ball to be used much, *much* more often, and gathering many more friends. Note: trying to catch a new enemy while the old one is in the process of spawning will result in the ball phasing through, catching nothing, thus wasting charge.
* : Causes remaining charge from the previous floor to carry over to the next one.

## Unlockable Achievements

* Extension Cord - Have , , and  in Isaac's collection.

* Jumper Cables - Pick up any 2 of the following items/trinkets in a single run: , , , , and  ( Any 2 items that have the 'battery' item tag).

## Trivia

* This item is used in It's in the Cards (challenge #14).
* The screws that appear in Isaac's head may be a reference to Frankenstein's Monster.
* The effect of this item was completely changed from the original *Binding of Isaac*.
Triachnid

**Triachnid** is a boss that can appear:

* In all environments of Chapter 4 (Womb, Utero, Scarred Womb).
* Only in the Utero and the Scarred Womb.

## Behavior

Triachnid's head hangs down stationary and can perform the following attacks:

* Raises his head making it invulnerable and stomps the ground in random locations around the room 3 times in quick succession, leaving small puddles of slowing White Creep.  One of these legs will always stomp on top of Isaac's position.
	+ The appendages that he stomps with can be attacked to damage him.
* Lifts his head off-screen and stomps the ground 3 times at regular intervals on top of Isaac's position, leaving a small puddle of White Creep with each stomp. At the end of the stomps, he slams his head down quickly in the center, shooting 8 white projectiles in all directions and creating a large puddle of White Creep. He can only slam his head down along a horizontal plane across the center of the room and slams it down close to Isaac's position.
	+ Occasionally performs a fourth stomp before slamming his head down and very occasionally performs a fifth.
	+ Occasionally, when he slams his head down, he leaves a larger puddle of White Creep, but only shoots 4 white projectiles in the cardinal directions.
	+ The appendages that he stomps with can be attacked to damage him.
* Spits out a Trite in Isaac's direction.
	+ Trites can be killed by Triachnid's stomps and head slam.

Triachnid's foot stomp and head slam deal a whole heart of contact damage.

## Gallery

* Triachnid in-game.
* One of his appendages.
* Triachnid as one of  Delirium's forms.

## Notes

* Unlike all other other alternative versions of bosses such as  Dangle, C.H.A.D., and Gish, Triachnid has the same weight as his alternative boss form.
	+ Although they share the same weight, Triachnid is actually **more** common than Daddy Long Legs, since he also appears in the Scarred Womb.

## Trivia

* Triachnid was added in the *Wrath of the Lamb* DLC for the original *The Binding of Isaac*.
	+ In the original Binding of Isaac, Triachnid could be encountered in Necropolis.
* Triachnid originated from the 2006 flash game *Tri-achnid*, which was created by Edmund McMillen.
* He is an alternative of Daddy Long Legs.
	+ Unlike the other alternate bosses ( Steven, C.H.A.D., Gish, and Conquest), Triachnid does not drop a specific item.
* While Daddy Long Legs uses 4 appendages in his attacks, Triachnid is reduced to mostly only using 3; this is most likely in homage to the fact that Triachnid in his title game only had 3 appendages.
* Triachnid's unlock method is possibly a reference to a bug in the original *Wrath of the Lamb* that caused Triachnid to occasionally replace Isaac in the Cathedral.
* Triachnid does not have a death animation.
* Triachnid can be found in The Void, even before being unlocked.
* Blighted Ovum,  Big Horn, Triachnid, Isaac and ??? are the only bosses whose portraits were completely changed in *Repentance* (beyond simply adding more detail). Of these, only Triachnid, Isaac, and ??? didn't receive new sprites.
The Negative

### Collection Grid

*(page 4, column 3, row 3)**(page 3, column 3, row 5)**(page 3, column 4, row 5)*

### Unlock Method

 Defeat Satan 5 times

**The Negative** is an unlockable passive item.

## Effects

* If the character has half a red heart or no red hearts after taking damage, it triggers  effect, damaging all enemies in the room.
* Allows entrance into the Dark Room after beating Satan in Sheol by touching the chest.
* +1 damage.
* Opens  A Strange Door in Depths II and its variants that leads to Mausoleum/Gehenna II.
	+ Unlike with the Dark Room entrance, The Negative gets consumed by the door and vanishes from Isaac's inventory.

## Notes

* This item is a guaranteed drop from Mom, if unlocked. Will drop alongside , provided they are both unlocked. However, they are mutually exclusive: Once one of them is picked up, the other one will disappear.
	+ With the use of a teleportation item and either a 5 pip Dice Room or a , or , both The Polaroid and The Negative or multiple copies of The Polaroid or The Negative can be obtained.
	+ With  Jacob and Esau, proper alignment of both characters can enable picking up both The Polaroid and The Negative.
	+ With frame-perfect timing and a bomb, it is possible to pick up both The Polaroid and the Negative.
* The Negative always triggers when taking damage as characters who lack heart containers, such as  Azazel and  Tainted Azazel (by default),  ??? and  Tainted ??? (permanently),  Dark Judas and  Tainted Judas (permanently)  The Forgotten (only as the soul),  Tainted Forgotten (permanently),  Dead Tainted Lazarus(by default),  Tainted Bethany (permanently) or any other character who has chosen to trade away their heart containers in deals with the Devil, Black Markets, or with  or . It will also trigger if the character has only half of a red heart left.
* The Negative will be the rightmost item after defeating Mom, in case Curse of the Blind is active.
* It is possible to obtain two Negatives by obtaining one as an  Eden starting item.
* Obtaining multiple copies of The Negative does not cause its effect to stack.
* As with all items crucial to story progress ( and ,  and , , and ), this item has protection from full-run rerolls. It does not, however, share the immunity  has to D6-type rerolls and .

## Synergies

* / : Increases the damage from 40 to 80.
	+ **A Missing Page** + **Missing Page 2**: The damage increase stacks for a total of 120 damage.

## Trivia

* **The Negative** allows access to the Dark Room, which is also the name of a room used to develop photos (Darkroom).
* A negative is a piece of film with an image imprinted on it and developed, and light can be shone through it to imprint a positive image on photographic paper. A negative has inverted hues and luminosity.
	+ Because of the instant nature of Polaroid film versus regular film, however, Polaroids do not have negatives, and a dark room would not be required to develop one, which calls into question its relation to . However, this could probably explain the fact that both items can't be picked up together in a run (unless  or a 5-pip Dice Room is used).
Seeing Double

**Seeing Double** is challenge #40. The goal is to defeat Mom's Heart. This challenge is unlocked by defeating Mother.

## Difficulty

Otherwise a very standard run, the challenge comes from every enemy and boss placed naturally in rooms (as opposed to being spawned later) being doubled. Due to the high enemy density, damage may prove difficult to avoid in some rooms. It is recommended for oneself to be already familiar with the gameplay of  Jacob and Esau prior to attempting this challenge.

## Strategy

* Room clearing items like  and items synergizing well with  such as  can be incredibly useful.
	+ will only damage the original enemies in rooms, the doubled enemies that spawn will not take any damage.
* As Esau begins the challenge with , Secret Rooms are instantly revealed, which may provide Jacob and Esau with helpful resources.
* As Libraries are able to spawn in this challenge, they can be a valuable resource.  can help with protecting one of the brothers as well as instantly killing both Mom and Mom's Heart,  will create helpful wisps in combination with other books (e.g. ), and  will help sustain either brother's health.
* It may be wise to keep  if found, as the Shops it will spawn in Chapter 4 can be incredibly useful.
* is an extremely powerful item for this challenge that can be found in Shops, as permanently erasing common enemies can help tremendously.
* Mapping effects such as  or  can help quickly navigate through levels and avoid unnecessary risks.
* Teleportation items such as , , or Telepills can be used to quickly escape dangerous situations or skip rooms altogether.  may also be used to return to the previous room and revert any possible health loss.
* Room clearing effects are particularly powerful in this challenge:
	+ / will instantly clear more dangerous rooms.
	+ The  and other Ace cards will instantly clear rooms with large amounts of monsters, producing numerous pickups in the process.
	+ can be an effective boss killer, greatly damaging or eliminating one or both bosses.
	+ , if thrown correctly, can instantly kill numerous troublesome bosses and enemies in a single throw.
* Enemies and bosses in Challenge Rooms are not doubled, as they are not spawned when Jacob and Esau initially enters the room. This makes it worth considering to clear them for extra pickups and items.

## Notes

* Stonies, Death's Heads, and Mom are not doubled.
* Encountering two Baby Plums and allowing both of them to leave will grant only one .
* Prior to Version 1.7.5, Treasure Rooms did not appear.

## Reward

* Broken Glasses - Complete **Seeing Double (challenge #40)**.
The Book of Sin

**The Book of Sin** is an unlockable activated item.

## Effect

* Generates a random pickup, pill, card, or rune.
	+ This includes , , and .
	+ Hearts can be of any type other than  Blended Hearts.
	+ Pennies can be of any type, with higher value coins, including  Lucky Pennies, and  Sticky Nickels, being rarer.
	+ Bombs and Keys will always be singular (unless Isaac has  and/or ).
	+ Batteries spawned can be Lil' Batteries and, more rarely, a Mega Battery or Golden Battery. The Book of Sin cannot generate a Micro Battery.
* Each pickup seems to be equally likely, which means that there is around a 1/7 chance to get a particular type of pickup.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into Bookworm.

## Synergies

* : Grants a random wisp based on one of the Seven Deadly Sins. The wisp spawned isn't linked to the pickup dropped.
	+ Pride: a blue bomb wisp in the middle ring. When destroyed, a small homing bomb that deals normal troll bomb damage is spawned.
	+ Greed: 3 yellow coin wisps in the outer ring. Their tears may petrify enemies like .
	+ Wrath: an orange bomb wisp in the middle ring, which fire flaming tears. They drop troll bombs when continuously firing, and leave a bomb pickup when they die.
	+ Envy: a white face-like wisp in the outer ring.
	+ Lust: a randomly colored pill wisp in the inner ring, with effects that are the same as  wisps.
	+ Gluttony: a heart wisp in the middle ring, with effects that are the same as  wisps.
	+ Sloth: a Bob's Head wisp in the middle ring. Their tears travel in an arc like  but don't always explode on impact. There is a small chance for an exploding tear.

## Trivia

* The Book of Sin is a reference to the Seven Deadly Sins. Unlike other Book items, The Book of Sin doesn't appear to be based on a real book or scripture.

## Gallery

* 3DS The icon of The Book of Sin as seen on the lower 3DS screen.
The Nail

**The Nail** is an unlockable activated item.

## Effects

* Gives one Soul Heart, +0.7 damage, -0.18 speed, and the ability to destroy most obstacles by walking into them. Cannot be stacked in one room.
	+ Isaac deals 40 contact damage to enemies, once per second. Does not prevent Isaac from taking contact damage.
* Gives half a Black Heart, +2 damage, -0.18 speed and the ability to destroy obstacles for the current room.
	+ If used multiple times in one room, the speed penalty only applies once, but the damage buff can stack.
	+ Isaac deals 20 contact damage to enemies, twice per second. Does not prevent Isaac from taking contact damage.
		- If an enemy is at 40 HP or less, the contact damage is increased to 40 for that enemy.
* Isaac's tears become red for the current room.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into Leviathan.

## Notes

* Isaac makes a demon sound when taking damage while this item is in use. This is quieter than Isaac's standard damage sound and is easy to miss.

## Synergies

* : Spawns black wisps on the inner ring. Wisps shoot nails that deal double damage from standard wisps, and have increased knockback, akin to .

## Gallery

* 3DS The icon of The Nail as seen on the lower 3DS screen.

## Trivia

* The item's effect is a reference to the Nail of Vlad item in Castlevania II: Simon's Quest; equipping it would allow Simon to break certain obstacles such as rocks.
* In the original The Binding of Isaac, The Nail was unlocked by beating Mom's Heart three times.
* This item has the same pickup quote as .
* Biblically, this item likely references the nails used to pin Jesus Christ to the cross.
The Intruder

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

## Effects

* Gives Isaac a spider familiar that burrows in Isaac's head, firing four slowing tears in addition to Isaac's normal tears.
	+ The slowing tears deal 1.5 damage each, and fired every 1.5 seconds.
	+ These tears are unaffected by Isaac's damage and tears stats; they have fixed damage and fire rate.
* Upon taking damage, there is a chance that Isaac's head will pop, spawning friendly spiders, and release the Intruder familiar, who will leap at enemies to deal contact damage, and fires four slowing tears towards nearby enemies instead of Isaac.
	+ The spider familiar deals up to 4.5 contact damage depending on how fast it's moving and fires slowing tears twice as fast compared to when it's in Isaac's head.
	+ The chance for activation goes up to 100% at 4 luck.
	+ The familiar lasts for the current room, and Isaac's head is reattached upon entering a new room.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a humanoid spider.

## Notes

* The Intruder is treated as a familiar even while in Isaac's head, and benefits from familiar synergies while in it.
* If The Intruder is released after  are used, control is given back to an invisible head with only a shadow visible. This is due to both the head (the spider) and the body being mobilized to attack.

## Synergies

* : The shots are homing even while in Isaac's head.
* : Doubles the number of tears fired from Isaac's head (if both copies fire at the same time, the tears will stack perfectly so it can be difficult to tell). If The Intruder is released, then interacts normally and spawns a copy.
* : Increases The Intruder's tear and contact damage.
* : Increases The Intruder's tear and contact damage. Does not stack with Hive Mind.

## Interactions

* : The Intruder's tears come from Isaac's body.
* Lilith: The Intruder's tears come from Lilith, despite her blindfold.
* : The Intruder can be sacrificed even while in Isaac's head.
* : When The Intruder is released, only Isaac's shadow will be visible.

## Trivia

* The Intruder is from the *Antibirth* mod. In *Antibirth*, once the item was picked up it could not be rerolled.
* The spider resembles the spider present in the pilot episode of *Hellbenders*, a popular flash cartoon and failed candidate for an Adult Swim show. The item itself may be a reference to this episode.

## Gallery

* Spider familiar spawned after taking damage.
Temporary Buffs

**Temporary buffs** are effects applied to the player character that expire after a timed duration or on leaving a room.

## Effects

 Invulnerability
While invulnerable, Isaac loses the ability to shoot tears, and flashes in multiple colors for the duration of the effect.

## Invulnerability

### Activated Items that grant invulnerability

 The Gamekid | 5.100.93
 Unicorn Stump | 5.100.298
The Swarm

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

## Effects

* Gives eight orbital flies when picked up.
* Each time a fly blocks a projectile, it will turn into a blue fly.
* Each time a room is cleared, spawns an orbital fly.
	+ The maximum number of orbital flies Isaac can have is 16.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a giant humanoid fly.
The Tank

**The Tank** is Challenge #5.  Magdalene is the default character for the challenge, and she starts with , , , and . The goal is to defeat Mom. This Challenge is unlocked when Magdalene is unlocked.

## Difficulty

The main difficulty of the challenge is linked to Magdalene's low Speed, which was already lower than average, but with  and , it is now at a mere quarter of the average speed(0.25) . Additionally, the Thunder Thighs effect can cause unwanted results when not paying attention, such as setting off Bomb Rocks or creating new monsters to fight.

## Strategy

* The Thunder Thighs effect can easily give access to chests and other items trapped behind rocks. This will allow bombs to be used more liberally for finding secret rooms, as well as in combat.
* Pills can be obtained from mushrooms, which may provide a much-needed Speed Up pill, but mushrooms can spawn poisonous clouds when destroyed, making this strategy risky.
	+ Completing Aprils Fool (challenge #32) allows Magdalene to spawn with a Speed Up pill, counteracting the heavy speed reduction from the challenge items and easily identifying future Speed Up pills.
		- The Speed Up pill is replaced with a Full Health pill, which can be useful to replenish Magdalene's health at the cost of her already low speed.
* Destroying as many rocks as possible is a recommended strategy, as this may result in finding a trapdoor. This can lead Magdalene to a Crawl Space or Black Market, thereby allowing the player to obtain valuable items.
* Magdalene's high starting Health makes it easier to take deals with the devil without harsh consequences.
	+ Recommended items include those that grant flight, such as  or , as they can give increased mobility in the lower levels.

## Unlockable Achievements

* Rune of Ansuz - Complete **The Tank (challenge #5)**.
Synthoil

### Collection Grid

*(page 4, column 10, row 4)**(page 3, column 20, row 5)**(page 3, column 1, row 6)*

**Synthoil** is a passive item.

## Effects

* +1 damage.
* +5.25 range.
* +2.5 range.
* +0.5 tear falling speed.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a buff berserker.

## Trivia

* Synthoil, or as it should correctly be spelled as "synthol", is a mixture of oil, lidocaine, and alcohol used to artificially increase muscle volume through scar tissue formation.
Tear Effects

This article is about Isaac's primary weapon. For the attribute of the same name that governs the rate of fire, see Tears. For debuffs that can be inflicted on monsters, see Status Effects.
**Tear Effects** modify Isaac's primary weapon — tears. A few of the most common tear effects are listed below.

## Effects

 Bouncing |  | Makes tears bounce off walls, enemies and environmental objects. Tears that bounce off of enemies bounce in random directions, whereas tears that bounce off of walls and other objects bounce directly back. When tears bounce from enemies, they become able to hit the same enemy again should they bounce off of another enemy or obstacle.

## Spectral

### Trinkets that grant spectral tears

 Ring Worm | 5.350.11
 Wiggle Worm | 5.350.10
 Ouroboros Worm | 5.350.96
Teleporters

Teleporters can be found in Mausoleum and Gehenna.

Walking on a teleporter causes Isaac to teleport to the one that has a matching symbol. If there are more than two teleporters in a room with the same symbol, then Isaac will teleport to a random one of them.

Teleporters can exist in both an active (glowing) and inactive (not glowing) state. If there exists two or more teleporters of matching symbols where some are active and others are not, it acts as a one-way teleporter with the inactive pad(s) being the exit point.

## Notes

* When playing as  The Forgotten, teleporting as  The Soul will also teleport The Forgotten's body.
The Pinking Shears

*Not to be confused with the  or .*

**The Pinking Shears** is an activated item.

## Effects

* Separates Isaac's head and body for the current room. Isaac's head, which now has flight, will be under the player's control, while his body will seek out enemies to attack by contact damage.
	+ The body's movement speed is dependent on Isaac's speed.
	+ The body deals 5.5 damage per tick, or up to 82.5 damage per second.
	+ The body deals 5.5 damage per tick, or up to 23.6 damage per second.

## Notes

* The damage of the body familiar is independent of Isaac's stats.  Its damage per second is the highest of all chasing familiars.
* If Isaac's body is not visible (for example, through the effects of  or previous uses of the Pinking Shears), the familiar will gain Flight and take upon a ghost-like body, similar to the Lost's body type.
* If used multiple times in the same room (via battery pickups, for example), more instances of the body familiar can be spawned.
* If Isaac switches active items while The Pinking Shears is in effect, the body will immediately despawn for the rest of the room.
* The body familiar will avoid creep, and will consequently rarely damage enemies like Brains and Blighted Ovum that leave creep trails as they walk, instead opting to stand right next to them.
* Using The Pinking Shears just above an obstacle results in the body becoming stuck in the terrain, making it useless until the obstacle is destroyed.

## Synergies

* : Damage dealt by the body is doubled.
* : Spawns wisps on the inner ring, looking like Isaac's floating head. Wisps fire piercing tears.
* : Two bodies are spawned at once.
* Tainted Forgotten: Only the head needs to be moved by the  Tainted Soul.

## Interactions

* : If Scissors and Pinking Shears are used together, control is given back to an invisible head with only a shadow visible as both the head and body are mobilized to attack.
* : Using The Pinking Shears after picking up Guillotine results in the head revolving around a shadow, making Isaac's hitbox difficult to determine.
* : If the familiar is released after Pinking Shears are used, control is given back to an invisible head with only a shadow visible. This is due to both the head (the spider) and the body being mobilized to attack.

## Trivia

* In the original *The Binding of Isaac*, The Pinking Shears were unlocked by dying 100 times. In Rebirth, this unlocks  instead.
* Pinking shears are shears with a serrated blade and are used for cutting canvas.
* Isaac's headless body looks similar to a Pacer.
* The body shares the same appearance as Isaac's body but with blood gushing from the top, similar to a Gusher.

## Gallery

* 3DS The icon of The Pinking Shears as seen on the lower 3DS screen.
Teardrop Charm

**Teardrop Charm** is a trinket added in *The Binding of Isaac: Repentance*.

## Effects

* Luck-based tear effects (i.e. status-inflicting tears or other effects, such as ) have a higher chance of occurring.
	+ The bonus is equivalent to +4 Luck, but the other benefits of Luck do not apply.

## Notes

* Because the bonus is a flat +4 luck, this trinket works best on items that require a low luck stat to trigger most often.
	+ These items include , , , , , , , , and

## Trivia

* Teardrop Charm is from the *Antibirth* mod. In *Antibirth*, the bonus was equivalent to +3 Luck.