recursal/Fanatic-Fandom huggingface dataset:
Monstro's Tooth

**Monstro's Tooth** is an activated item.

## Effect

* A friendly Monstro jumps on a random enemy, dealing 120 damage while destroying nearby obstacles like rocks.

## Notes

* This item will target Isaac if it is used in a room without monsters and can cause damage.
	+ Monstro can be dodged in multiple ways depending on Speed and timing.
		- At 1.95 Speed or higher, Monstro can be dodged by walking in a straight line.
		- At 1.84 Speed or higher, Monstro can be dodged by standing still for a moment, and then moving.
		- At 1.69 Speed or higher, Monstro can be dodged by walking in one direction then walking in the opposite direction with the right timing.
		- At 0.86 Speed or higher, Monstro can be dodged by walking in a straight line.
		- At 0.62 Speed or higher, Monstro can be dodged by standing still for a moment, and then moving.
		- At 0.38 Speed or higher, Monstro can be dodged by walking in one direction then walking in the opposite direction with the right timing.
* Monstro will target Shopkeepers.
* If Monstro falls near the entrance to a Secret Room, it will be opened. This can be used to open Secret Rooms without using Bombs.
* Like Mom and Satan's stomp attacks, this attack is treated as an explosion, so  and  will be activated if Monstro falls on Isaac.
* This item does not affect the boss, Monstro.

## Synergies

* : Spawns wisps in the middle ring, looking like teeth. These wisps shoot 50% slower than the average wisp, but deal 12 damage per shot.
* : Monstro deals double damage.

## Gallery

* 3DS The icon of Monstro's Tooth as seen on the lower 3DS screen.

## Trivia

* The tooth can be seen missing in Monstro/ Monstro II's mouth.
* This item is similar to , but deals less damage.
* Judging by the sprites of Monstro/Monstro II, it can be assumed that the missing tooth is an incisor tooth or canine tooth. The item physically resembles a molar tooth however.
* This item's unlock is the most common steam achievement in the game.
Shot Speed

**Shot Speed** is the attribute that governs how quickly an individual tear travels and is represented by a speeding ball.

 Shot Speed also affects the *effective* range of the tears. As the range stat determines how long tears will stay in the air (and not distance traveled), a lesser shot speed reduces effective range.

Shot speed measures the velocity of each tear in contrast to the Tears stat, which measures tear frequency.

A tear traveling at 1.0 shot speed crosses one tile in 4 ticks (8 frames, or 0.133 seconds), giving a velocity of 7.5 tiles per second. Higher and lower values of the attribute scale the velocity linearly.

## Notes

* All characters start with the same shot speed except for  Samson, who has 1.31 shot speed, and  Eden, whose shot speed can be anywhere between 0.75 and 1.25.
* A higher shot speed will increase the directional knockback of enemies hit by the tears.
* Having a high shot speed is not always desirable. While a high shot speed means enemies are easier to aim at,  and effective range is increased , it also means more knockback, which can make enemies move in unpredictable ways, potentially damaging Isaac and making it harder to land consecutive shots. Some items will also directly benefit from low shot speed, such as  and , and particularly items that grant homing tears, such as  and .
* Items that reduce shot speed cannot lower it past 0.6.

## Items that affect shot speed

### Other

* In co-op, Long Baby will occasionally briefly increase range, shot speed, and tear falling speed. Dark Baby will occasionally briefly increase all stats, including shot speed.
* The  card decreases shot speed and increases speed for the current room.
Sack Head

### Collection Grid

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

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

## Effects

* Coins have a 10% chance to be replaced with Grab Bags. Bombs, Keys, Cards, Runes, and Lil' Batteries have a 20% chance.
	+ This includes pickups spawned by most sources: room rewards, chests, slot machines, special shopkeepers, etc.
	+ Coins bombed out of a Donation Machine can become sacks.
	+ The exception to this are pickups spawned by Isaac himself directly, e.g. with the likes of  or , and contents of other sacks.
* Spawns a sack upon pickup.

## Notes

* The item does not replace hearts, pills and chests.
* The item can also replace Troll Bombs and Mega Troll Bombs that are not used as attacks, i.e. generated as room rewards, chest contents and such.
* The pickup replacement is applied retroactively when the item is collected: any appropriate pickup already existing on the current level may be replaced by a sack.
* Sacks on each floor tend to have the same contents, which can be taken advantage of if cards are involved.
* Picking up a Golden Penny may spawn a sack instead of another Golden Penny.
* in the Ascent can be replaced by a sack, thus it is not recommended to take the item if you're going to unlock a tainted character.

## Synergies

* : Sacks may drop new sacks while Equality! is active, potentially resulting in massive amounts of resources from a single sack.

* : Coins spawned from hitting enemies have a chance to become sacks.
* Tainted Keeper: The coins dropped from killing enemies have a chance to be sacks instead. The sacks do not flash and disappear.

## Trivia

* The appearance given by the item is most likely based on one of the trailers for Rebirth, where several naked people are wearing sacks with crying eyes, strikingly similar to Sack Head.

## Gallery

* Afterbirth item and trinket concepts, including Sack Head.

## References

1. ↑ https://www.youtube.com/watch?v=rS6gMCE\_TJQ
Spelunker Hat

**Spelunker Hat** is a passive item.

## Effect

* Reveals on the map what type of room all rooms adjacent to your current room are (Shop, Sacrifice Room, etc.).
	+ Can also reveal Secret Rooms, Super Secret Rooms, and Mini-Boss Rooms.
	+ Reveals rooms up to 2 rooms away.
* Blocks projectiles falling from above.
	+ Cannot block Mom's Foot.

## Trivia

* The item is a reference to the game Spelunky.
* Despite being a light source such as the , this item does not project a beam of light.
* In the original *Binding of Isaac*, Spelunker Hat was not unlocked by default and had to be unlocked by beating The Caves for the first time.
Rusted Key

**Rusted Key** is a trinket.

## Effects

* Gives a 10% chance of changing the room drop reward to a Key.
* Gives a 33% chance of adding a key to the rewards from opening certain Chests, or destroying Tinted Rocks, certain Machines, and certain Beggars.
	+ Other than Tinted Rocks, these can only drop the key 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

## Trivia

* In the original *Binding of Isaac*, this trinket was broken and didn't do anything.
Safety Cap

**Safety Cap** is a trinket.

## Effects

* Gives a 10% chance of changing the room drop reward to a pill.
* Gives a 33% chance of adding a pill to the rewards from opening certain Chests, or destroying Tinted Rocks, certain Machines, and certain Beggars.
	+ Other than Tinted Rocks and  Wooden Chests, these can only drop the pill if they drop coins, hearts, Bombs, or Keys.
		- Wooden Chests can even drop the pill in addition to an item.
	+ 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

## Trivia

* The quote is probably a reference to the song "Don't Swallow The Cap" by The National.
Range

**Range** determines how long tears will travel before landing and is represented by a bow and arrow.

 This attribute's name is misleading because Range determines the *time* that a shot stays in the air rather than the *"distance"* that it travels. The effective Range is calculated based on said travel time, Shot Speed, and Tear Falling Speed. Range cannot be lowered below 5.0 but has no upper limit. Internally, this attribute is called Tear Height, and also affects the starting height that tears spawn at.

* Range now represents how many tiles a tear will travel. Range cannot be lowered below 1.0, but has no upper limit. Tear Height no longer represents this attribute and no longer affects effective range.

Extremely high Tear Height makes Isaac's tears start so high in the air they can cross over obstacles as if they were spectral, but they won't go through room walls. Once the tears fall down, they will start hitting obstacles again. This compounds with Tear Falling Speed.

Each character's base Range is as follows:

* Post-Repentance
* Pre-Repentance

  Esau | 8.0

* Azazel: The mini-blood barrage doesn't calculate its Range the same way as normal tear attacks, so his Range stat is misleading. His attack has a much shorter Range than other characters with the same value.
* Eden and  Tainted Eden: Range is a random value between 5.0 and 8.0, inclusive.
* The Forgotten and  Tainted Forgotten: Their melee attacks don't calculate their Range the same way as normal tear attacks, and their actual attack Range is far less than other characters with the same value.
* Tainted Azazel: The blood barrage has unlimited Range, so his Range stat isn't commonly relevant.
* Tainted Soul: Incapable of firing tears.

  Isaac  Magdalene  Judas  Dark Judas  ???  Eve  Lazarus Risen  The Lost  Lilith  Keeper  Apollyon  The Forgotten  The Soul | 23.75

* Azazel: The mini-blood barrage doesn't calculate its Range the same way as normal tear attacks, so his Range stat is misleading. His attack has a much shorter Range than other characters with the same value.
* Eden: Range is a random value between 18.75 and 28.75, inclusive.
* The Forgotten: The melee attack doesn't calculate its Range the same way as normal tear attacks, and their actual attack Range is far less than other characters with the same value.

## Items That Affect Range

### Other

* Range Up pills increase Range by  2.5  1.25, and Range Down pills decrease Range by  2  1.
* In co-op, Long Baby will occasionally briefly increase Range, Shot Speed, and Tear Falling Speed. Dark Baby will occasionally briefly increase all stats, including Range. Dripping Baby will occasionally briefly grant , increasing Range.
* activates the  effect for the current room, which increases Range.
* increases Range, Damage, and Isaac's size for the current room.
Strange Key

This article is about the trinket that opens the Hush fight and empowers Pandora's Box. For the trinket that creates Blue Womb rooms, see Blue Key.
**Strange Key** is an unlockable trinket added in *The Binding of Isaac: Repentance*.

## Effects

* Unlocks the passageway to ???, regardless of run duration.
* If  is used while holding Strange Key, the following effects will occur instead of Pandora's Box regular effects:
	+ The normal effect of Pandora's Box for that level is ignored, and instead 6 items from a set of item pools are spawned.
	+ Both Pandora's Box and the trinket are consumed.

## Notes

* The items are chosen from the following item pools: Treasure Room, Shop, Boss, Devil, Angel, Secret Room, Library, Golden Chest, Curse Room and Planetarium.
* Both effects work even if the key has been turned into a passive item from items such as  or .
	+ Using Pandora's Box with the key in this state will remove the key from Isaac's Inventory.
* If playing with modal characters such as  Tainted Lazarus, the character with the Strange Key must enter the room while holding it to cause the passage to open. Leaving and re-entering the room after switching to the correct character will open the door normally.
* Unlike with , Mom's Heart / It Lives must be beaten for the passageway to ??? to open.
* If the passageway to ??? is somehow not yet unlocked, Strange Key will not open the door.

## Trivia

* Strange Key is likely a reference to the film by David Lynch, *Mulholland Drive (2001)*, where a small blue box being unlocked by a strange key is a major plot point.
Obsessed Fan

### Collection Grid

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

 This article is about **Obsessed Fan**, similar in appearance to Psy Fly.
**Obsessed Fan** is a passive item added in *The Binding of Isaac: Afterbirth*.

## Effects

* Spawns a familiar that follows Isaac's movement with a 3-second delay and deals 2 contact damage to enemies per tick (30 damage per second).
	+ The fly follows Isaac on a 0.66 second delay instead.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a giant humanoid fly.

## Notes

* If other familiars that move with a similar pattern such as  have been collected before the Obsessed Fan, it will follow them instead with further delay.
Super Wrath

Cannot be encountered in Chapter 1 Mini-Boss Rooms

Degraded Mini-Boss

**Super Wrath** is a mini-boss and one of the Seven Super Deadly Sins. He is randomly encountered as an alternate version of Wrath.

## Behavior

* Super Wrath wanders around the room randomly, spawning Mega Troll Bombs on his position.
	+ Super Wrath takes only 20 damage (not the usual  60/ 100) from his own bombs.
* Super Wrath deals a full heart of damage (both bombs and contact).

## Notes

* In a mini-boss room, Super Wrath can spawn near 2 Mega Troll Bombs.
* Isaac's bombs and  missiles deal 200 damage regardless of modifiers or damage stat.
* replace the Mega Troll Bombs with  drops.
* or  renders Super Wrath unable to damage Isaac with bombs. Explosions can still knock Isaac into hazards.

## Trivia

* Super Wrath's blasted and soot-covered appearance suggests a backfired or failed attempt to handle a bomb.
	+ This could also refrence the fact that Wrath tends to get hit by its own bombs.
* Wrath and Super Wrath bear a strong resemblance to the title character of the *Bomberman* series, both in their appearance and their fighting style. The character is likely a reference to the stress a player in Bomberman may feel when trapping themselves with a bomb, especially at the start of a match. Super Wrath's self-inflicted blast marks reinforce this idea.
* 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.
Swallowed Penny

**Swallowed Penny** is an unlockable trinket.

## Effect

* Spawns one coin of any type upon taking damage.
	+ When held by  Keeper and  Tainted Keeper, spawns 0-1 coins.

## Notes

* Swallowed Penny can also be found by destroying urns and  Special Shopkeepers.
* Though similar to the  item, the Swallowed Penny is not limited to just pennies.
* Unlike , playing as  Keeper with this trinket always drops a coin, allowing semi-infinite life.
	+ A trick for farming money when playing as Keeper is to find a room with some static hazard like spikes and taking damage, causing a coin to appear. A penny will only refill life while a nickel will give four cents, and a dime will give nine cents.
	+ This trick can also be used to survive multiple uses of a sacrifice room, healing with the dropped coin between each sacrifice.
	+ As it can now give 0 coins when playing as the Keeper, this no longer works. When combined with , money will still be gained on average, but it is no longer guaranteed. Using  as the source of damage increases the average amount of coins per damage to 1.5, meaning that it will usually generate a pool of coins that can be used during an unlucky break or for later healing.

## Synergies

* Golden Trinket /  / : Each effect/trinket copy spawns one more coin on getting hit  or adds another 0-1 chance as  Keeper or  Tainted Keeper.
Roid Rage

**Roid Rage** is a passive item.

## Effects

* +0.6 speed
* +5.25 range
* +0.3 speed
* +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.

## Notes

 Having multiple copies of , such as those duplicated by  will only increase the range, leaving the speed stat unaffected.

## Unlockable Achievements

* Little Baggy - Pick up any 2 of the following items in a single run: , , , , and  ( Any 2 items that have the 'syringe' item tag).

## Trivia

* Roid Rage describes the frequent anger outbursts induced by the overuse of steroids.
* Prior to Repentance, Roid Rage was the biggest speed upgrade in the game with the title now going to  with its +0.4 speed, which is still 33% smaller.
Spider Baby (Transformation)

This article is about the transformation. For the passive item, see Spiderbaby.
Upon picking up 3 spider items ( 3 items with the `spider` item tag), Isaac will gain a Spider familiar that applies random status effects to enemies it comes into contact with. Contrary to popular belief, this transformation does not generate friendly spiders on hit. Confusingly, that effect is given by the item of the same name, which also contributes to this transformation.
Shopkeeper

Shopkeepers are present in every Shop and most Secret Rooms, and can also be found in Vaults, Arcades, Bedrooms, and I AM ERROR rooms. They cannot be hit by normal attacks, but explosions and certain items will damage them. Occasionally, destroying them will yield rewards.

Destroying a shopkeeper increases the chance for a Devil Room or Angel Room to appear by 10% for the current floor.

## Normal Shopkeepers

### Possible Rewards

* Nothing
* 2 random Coins
* 2 Spiders
* (1% chance)
* (1% chance)
* (1% chance)

## Special Shopkeeper

### Unlock Method

 Donate 234 Coins to the Greed Donation Machine

Special shopkeepers have a chance to replace regular shopkeepers. Special shopkeepers are unlocked by donating 234 coins to the Greed Machine and special hanging shopkeepers are unlocked by donating 14 coins to the Greed Machine.

### Possible Rewards

* Nothing
* A Nickel / Sticky Nickel
* Greed
* /  /  /  /  /

## Notes

* Shopkeepers have 5 hit points, but most attacks capable of hitting them deal more damage than that.
* Non-explosion attacks that can damage shopkeepers include , , , , and .
	+ The blast from  will hit shopkeepers, but the slicing attack will not. This means an extra target is required to destroy a shopkeeper with Dark Arts.
	+ The blast from  will hit shopkeepers.
	+ Collision damage from  will hit shopkeepers.
	+ Shopkeepers can be grabbed with .
* With , destroying shopkeepers will spawn blue spiders.
* Using the `PAC1 F1SM` Seed makes Shopkeepers invincible too.
* If Greed appears after destroying a Special Shopkeeper, the doors will be locked.
* Shopkeepers will be targeted by Mom's foot when using .
* If Isaac already has  and , Shopkeepers will not drop any further pedestal items.
* If Isaac has  and hits an enemy near a Shopkeeper with a Holy Light tear, the Shopkeeper will be destroyed by the beam of light.
* If aligned correctly, Shopkeepers can be destroyed using . The shockwaves may also hit the Donation Machine.

## Unlockable Achievements

* Lucky Toe - Blow up 20 **Shopkeepers**.

## Trivia

* The Shopkeeper's faces occasionally take on the appearance of certain popular Internet memes, such as "Forever Alone".
* A Shopkeeper shares the appearance of a Dummy.
* Edmund has confirmed that all Shopkeepers (and, by extension, the Keeper) are mummified versions of Isaac from previous runs.

## References

1. ↑ https://twitter.com/edmundmcmillen/status/1568484195252731904
Shard of Glass

**Shard of Glass** is a passive item added in *The Binding of Isaac: Afterbirth †*.

## Effects

* Adds a 25% chance to drop a full Red Heart upon taking damage.
* Adds a separate 10% chance to gain the  effect (+5 range, red creep trail) for the current room upon taking damage.
* Taking damage will cause Isaac to bleed, spewing blood tears around him constantly.
	+ Holding a direction of fire focuses the bleeding tears to that direction, with slightly increased range.
		- The bleeding tears can be aimed at any direction just like having .
	+ After bleeding for 20 seconds, Isaac's Red Hearts or Rotten Hearts will take damage (bypassing other Hearts); this is indicated by Isaac slowly turning red after and eventually blinking. This damage also has a 25% chance to drop a full Red Heart. The damaging effect will continue to occur every 20 seconds until the bleeding effect ends.
		- The damage amount is always half a Red Heart, a Coin Heart, or a  Rotten Heart, even in later chapters where most damage is now a full Heart or two Rotten Hearts.
	+ The bleeding effect ends when Isaac receives any form of Red Heart or  Rotten Heart healing, if he has no more Red or Rotten Hearts, if he fills an Eternal Heart, or if the next hit would kill him.
	+ If Isaac has no Red or Rotten Hearts, the bleeding effect of Shard of Glass will not activate.

## Notes

* Red Hearts spawned by this item may become different hearts in certain Super Secret Rooms.
* Taking bleed damage will not affect Devil/Angel room chance.
* Bleeding blood tears will not keep any tear effects or special tears that Isaac have.
* The bleeding effect carries over to the next floor if Isaac moves on to the next floor while still bleeding.
* If Shard of Glass is re-rolled or lost while Isaac is bleeding, the bleeding will continue, but Red Hearts will no longer spawn when Isaac takes damage. This makes Shard of Glass especially deadly to Tainted Eden with a red-heart build.
* The Forgotten can end the bleeding by switching to  The Soul.
* The bleeding effect works with  Keeper and  Tainted Keeper. They will bleed and lose a coin heart until only one coin is left. Receiving coins will stop the bleeding effect. Due to Tainted Keeper only having two coin hearts in most circumstances, bleeding will rarely apply to him.
* Rotten Hearts will take bleeding damage only when Isaac has no red hearts remaining. Picking up Rotten Hearts will also end the bleeding.
* Using a bed or a Full Health pill to heal Isaac's red hearts will not stop the bleeding.
* Turning into The Lost via the White Fire Place or  will stop bleeding effect.
* Using the  will stop the bleeding effect.

## Synergies

* / : Bleeding tears will aim at the crosshair.

* : Bleeding tears will aim at the controlled tear.

## Trivia

* "Blood and guts" is a term for violence, typically in fiction.
* If the bleeding is the cause of death, Isaac's last will will show a Blood Donation Machine as the cause of death.
Spider

### Found In

**Spiders** are arachnid enemies that can be commonly found in most chapters. They move quickly and will go in all directions randomly, making them unpredictable. However, if they have a direct line of sight on Isaac, and are close enough, they will move towards him. They are also able to fit through small diagonal gaps.

## Variations

### Stage HP

 20
 0

### Found In

**Big Spiders** look like regular Spiders, but with a large black abdomen attached. They behave in the same way as the regular Spiders, having the same movement speed and erratic behavior. However, they have over triple the health of regular Spiders, and upon death, they will split into two regular Spiders. They will not split if they are killed by an explosion.

### Stage HP

 4.5
 0.2

### Found In

**Swarm Spiders** act much like normal Spiders but are much smaller and tend to come in much larger groups. They also hop and flash a bright yellow.

They are spawned by Eggies in large number when one dies.

Swarm Spiders cannot be damaged by Fire Places.

### Stage HP

 6.5
 0

### Found In

 (Downpour only)
 (Downpour and Dross only)

**Striders** are a type of spider that can only spawn in Downpour and special rooms in Dross. They glide on the water towards Isaac in short bursts and can swim across flooded gaps.

Striders replace all Spider spawns in the Downpour and Dross stages.

## Gallery

* A Spider on Isaac's Last Will.
* Concept sketches of monsters implemented in Repentance, including the Swarm Spiders.

## Notes

* The following spiders will not attack Isaac, deal contact damage or actively spawn enemies if he has :
	+ Spider, Big Spider, Level 2 Spider, Ticking Spider, Baby Long Legs, Small Baby Long Legs, Crazy Long Legs and Small Crazy Long Legs.
	+ Spiders and Big Spiders no longer blink red when neutral due to it.
	+ Swarm Spiders no longer blink yellow when neutral due to it.

## Trivia

* The original Spider and Big Spider were first added to the original *The Binding of Isaac* game's DLC - *Wrath of the Lamb*.
* Striders are from the *Antibirth* mod.
* Striders are named after the family Gerridae, also known as water striders.
* Swarm Spiders have the lowest Stage HP among all entities in the game by far. It takes until Caves I (etc.) before they have more than 5 HP, and then until Sheol / Cathedral before they have more than 6 HP.
Sacrificial Dagger

**Sacrificial Dagger** is an unlockable passive item.

## Effect

* Gives Isaac a sideways dagger that orbits him, dealing high damage to enemies on contact and blocking enemy shots.
	+ The knife deals 15 damage every 1/15th of a second (every 4 frames) or 225 damage per second.
	+ The knife deals 15 damage every 2/15ths of a second (every 8 frames) or 112.5 damage per second.

## Notes

* The dagger orbits further away from Isaac than many other orbital familiars (minus ), making it easier to use both offensively and defensively.

## Trivia

* Sacrificial Dagger deals the highest amount of contact damage out of all orbitals.
* Prior to *Repentance*, Sacrificial Dagger dealt the highest amount of contact damage out of all orbitals. With the changes in *Repentance*, it is beaten by .
* In the original *The Binding of Isaac*, Sacrificial Dagger rotated upright, while in *Rebirth* it now orbits on its side.
* This item is used in Darkness Falls (challenge #4).
* While the in-game name and Steam achievement name says 'Sacrificial Dagger', when unlocked, the in-game text shows 'Sacrificial Knife'.
* The Sacrificial Dagger's description is likely a reference to the Jewish story of Abraham's sacrifice of his son, Isaac (in what is known as the Binding of Isaac). Abraham took his son Isaac to a mountain to sacrifice his son at the command of God. Despite being commanded to do so, he knew through his faith that God would not allow his son to be sacrificed.
Spider Bite

**Spider Bite** is a passive item.

## Effects

* Adds a 25% chance to shoot slowing tears, reducing the speed of enemy movement and any projectile fired by them.
* This item belongs to the  set. Collecting three items from this set will transform Isaac into a humanoid spider.

## Notes

* The slow duration is 2.5 seconds.
* The slow effect chance depends on the luck stat. The activation rate is equal to 1/(4 - (Luck / 5)). At base luck (0), the chance is 25%, maxing out at 100% at 15 luck.
	+ Due to how this formula works, increases in activation rate are only seen with every 5 points of luck, as this formula rounds down after dividing Isaac's luck by 5.

## Synergies

* : The beam turns light pink and can slow enemies.
* : Finger can also apply the slow effect.
* ///: The laser turns light pink and can slow enemies.

## Trivia

* In the original *Binding of Isaac*, Spider Bite was not unlocked by default and had to be unlocked by beating The Basement for the first time.

## References

* The Binding of Isaac Item Trigger Testing
Stud Finder

**Stud Finder** is an unlockable trinket added in *The Binding of Isaac: Afterbirth*.

## Effect

* When a rock is destroyed, there is an additional 1 in 200 chance for a Crawl Space to spawn.

## Notes

* Stud Finder's effect is applied when a rock is destroyed and does not depend on the rock's location.
	+ Any of the rocks already seen before picking up Stud Finder can be affected by the trinket.
	+ doesn't synergize with Stud Finder as there is no set location for the rocks that will reveal a Crawl Space when destroyed with Stud Finder.
	+ Unlike Tinted Rocks and normal Crawl Space rocks whose generation is dependent on the room they're in, Stud Finder's Crawl Space generation effect mainly depends on the number of rocks destroyed, which means that the more rocks destroyed, the higher the chance to find a Crawl Space.
* With  or a  Golden Trinket, the chance to find a crawl space increases to 1 in 100.

## Gallery

* Stud Finder's original appearance before Booster Pack #5.
Stigmata

**Stigmata** is a passive item.

## Effects

* Grants one full Red Heart container.
* +0.3 damage.
* Heals 1 additional Red Heart.

## Trivia

* "Stigmata" is a term used by Catholic priests to designate wounds, sores, etc. found at the same locations on the body as those Jesus sustained during his crucifixion (e.g. palms, feet).
* This item is functionally identical to .
Slipped Rib

**Slipped Rib** is an unlockable passive item added in *The Binding of Isaac: Afterbirth † (Booster Pack #5)*.

## Effects

* Spawns a bone familiar that circles around Isaac and reflects enemy shots.
	+ The reflected projectiles deal 5 damage if they would've hurt Isaac for half a heart, and 10 for a full heart.
	+ The reflected projectiles deal 6 damage if they would've hurt Isaac for half a heart, and 7 for a full heart.
	+ Enemy damage modification from item effects or by stage does not affect the reflected damage.
	+ Reflected projectiles do not gain Tear effects from Isaac.
* The familiar does not deal contact damage, but kills the same types of flies on contact as Pretty Fly orbitals do.

## Notes

* Projectiles that create other projectiles (e.g.  Shady) can harm Isaac and be reflected.
* Homing projectiles (e.g. from Psychic Horf) do not retain their homing effect after being reflected.
* Slipped Rib can reflect:
	+ Explosive projectiles (e.g. from Gurgle), which explode as normal.
	+ Fireballs (e.g. from  Crackle), and their lines of fire do not harm Isaac.
	+ Fire projectiles (e.g. from Mega Satan).
	+ Obstacles thrown by  Polty or  Kineti, dealing a flat 35 damage.
* Slipped Rib does not reflect:
	+ Lasers or beams.
	+ Lines of fire from fireballs.
	+ Projectiles from  Big Bony,  Coal Boy,  Danny.

## Interactions

* : Increases its size but does not increase the hitbox or the reflected damage.

## Trivia

* This item is a reference to slipping rib syndrome.
* This item may be a reference to the Adam and Eve story in Genesis, where God takes a rib from Adam's body to create Eve.
* This item may be a reference to the NES game Castlevania 2: Simon's Quest, where Dracula's rib is an item used as a shield that protects from projectiles.
* This item is Edmund's favorite Booster Pack item according to \_Kilburn.

## Gallery

* Concept art for Slipped Rib on the right side, along with other Booster Pack items and trinkets, by Edmund McMillen.
Supper

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

## Effects

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

## Synergies

* : When Isaac picks up Supper it now grants: a permanent +0.5 Tears and +1.0 Luck, a temporary +3.6 Damage (which diminishes to 0 in 30 seconds), heals 1 additional red heart, and takes a permanent -0.03 Speed reduction.
	+ Item pedestals can also cycle between the initial item and Supper due to Binge Eater.
Rock Spider

**Rock Spiders** are small spider-legged stones and they were added to *The Binding of Isaac: Repentance*. They behave very closely to Spiders, but they are exclusive to Mines and Ashpit and skitter at a slower speed

Upon death, they turn into a normal Spider.

## Variants

### Stage HP

 22
 0

### Found In

Spawned exclusively from Tinted Rocks

**Tinted Rock Spiders** are similar to Rock Spiders, however they have nearly twice as much health and move much faster. When killed, instead of transforming into a regular Spider, they drop 1 Soul Heart upon death. They are characterized by the "X" on their rock, which is similar to Tinted Rocks.

They do not spawn naturally; there is a chance that 1-2 will spawn upon destruction of a Tinted Rock while in the Mines or Ashpit.

### Stage HP

 15
 0

### Found In

**Coal Spiders** behave very closely to Rock Spiders, but they skitter at a faster speed due to being on fire.

Upon death, it leaves a hot rock on the ground that despawns after several seconds. They can be shot to make them despawn faster.

Rock Spiders coming into contact with a Fire Place or fire spawned by items, such as  or , turn into Coal Spiders.

## Trivia

* The Rock Spider and all its variants originate from the *Antibirth* mod.
Schoolbag

**Schoolbag** is an unlockable passive item added in *The Binding of Isaac: Afterbirth † (Booster Pack #4)*.

## Effects

* Allows Isaac to hold two active items.
	+ Swap between active items by pressing the PC CTRL, PS4 R2, XboxOne RT, or Switch ZR.

## Notes

* The button to swap between active items is the same button used to swap between cards and pills.
* Items in the secondary slot will recharge at the same rate as the primary item.
* Items that grant temporary effects for the room, such as , may deactivate if switched with an item in the secondary slot.
* The  does not activate both active items.
* While holding an active item that grants passive bonuses in the secondary slot, swapping the main slot item with a pedestal item may remove the bonuses. If this happens, Isaac can swap the bonus-granting item to the pedestal and pick it up again to regain them.
* The swap key must be pressed twice if playing as  The Forgotten.
* This item cannot be unlocked if the player encounters more than  one/ two Curse of the Labyrinth in Chapters 1-3, except by chance of finding , , , , or a 5-pip Dice Room.
	+ If *one* Curse of the Labyrinth is encountered, getting to ??? or Mausoleum/Gehenna II and entering the Shop there will unlock the Schoolbag.
	+ If Curse of the Labyrinth was encountered twice, entering the shops in both Mausoleum/Gehenna II and ??? will unlock the Schoolbag.
* If  Tainted Isaac drops Schoolbag, the 2nd active item in the player's inventory is destroyed. However, a duplicate active item spawns beside Schoolbag. Tainted Isaac's reroll ability applies to this new item, and the player can choose between the original active item or a new item. Picking up the original active item again will count as another item towards any transformation.
* In "True" Co-op, when a player dies with this item, they will drop one of their active items if they have two. It is unknown if this is a bug or intended interaction.

## Synergies

* / + : The active item bombs are affected by Remote Detonator.
* +  : Converter turns one soul heart into 1 red heart, while Guppy's paw turns 1 red heart into 3 soul hearts. This effectively gives you infinite health for the run.
* : The cooldown before the player can use Kamikaze! again is eliminated when switching items. Depending on how fast the player can push the buttons, Kamikaze! can be used multiple times during Isaac's invincibility frames.
* : If a trinket is picked up while Mom's Box is in the active slot, swapping between active items will not remove the doubled trinket effect.
* / : Will continue to grant flight and the speed bonus while held in the secondary slot

## Interactions

* : Does not activate both active items.
* /  / : Switching items breaks the invincibility effect. This does not apply to other sources of invincibility.

## Gallery

* Schoolbag's appearance prior to Booster Pack #5.

## Trivia

* Schoolbag is based on the Racing+ implementation of the Schoolbag from the Antibirth mod, and it is the only item from Antibirth to be added to the game before Repentance.
* This item is used in  Baptism by Fire (challenge #38).
Safety Pin

### Collection Grid

*(page 4, column 4, row 4)**(page 3, column 14, row 5)**(page 3, column 15, row 5)*

 *For the boss with a similar name, see Pin. For the trinket with a similar name, see Push Pin.*
**Safety Pin** is a passive item.

## Effects

* Grants 1 Black Heart.
* +5.25 range.
* +2.5 range.
* +0.5 tear falling speed.
* +0.16 shot speed.
Swarmer

### Found In

**Swarmers** float aimlessly around the room, occasionally spawning Attack Flies. When hit, they will spawn a Pooter, and when destroyed, they will spawn a Boom Fly. Swarmers do not deal contact damage.

## Notes

* will charm a Swarmer. When charmed it won't spawn any Attack Flies until it is damaged. The Attack Flies that spawn will also be charmed.
* The ring of Flies that surround the Swarmer is an indication of how much health it has. The Flies deplete as the Swarmer takes more damage.

## Trivia

* Swarmers are the next and possibly the final stage of the original Gaper.
* As Swarmers have Champion forms it's possible to encounter a White Champion (though extremely rarely). This can be a challenging occurrence as the Swarmer will regain invincibility every time it takes damage due to spawning Pooters.

## References

1. ↑ https://edmundmcmillen.tumblr.com/post/51416553970/binding-of-isaac-fast-facts-now-they-need-to-do
Sharp Straw

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

## Effects

* Damages all enemies in the room.
	+ The damage dealt is equal to Isaac's current tear damage plus 10% of the enemy's max health.
* Has a 15% chance to drop Half Red Hearts when it damages an enemy.
	+ May also drop Half Soul Hearts. Half red hearts will always drop when Isaac has at least one red heart container; otherwise, half soul hearts will drop.
	+ The amount of enemies damaged does not improve the chance.

## Notes

* When used on Delirium, this item should be used when it isn't transformed to deal the most damage, as Delirium doesn't have his armor up when in his true form.
* For enemies that can disappear or go underground, it only affects them if they are visible.
* The Sharp Straw works exceptionally well with  Samson, giving the chance to collect large amounts of health per floor, allowing more damage to be taken resulting in more damage being dealt per use.

## Synergies

* : Enemies have a chance to spawn wisps in the outer ring when they’re killed by Sharp Straw. Using it in a room with no enemies does not grant a wisp. Despite Sharp Straw having a timed charge, the wisps persist between rooms.
* : Damage is doubled and two half hearts may be dropped.

## Interactions

* : Only provides a +2 damage bonus instead of +40.

## Trivia

* Before Booster Pack #5, Sharp Straw would instantly kill Big Horn if used while his hands were out due to their arbitrarily high health.
* Sharp Straw was originally an unofficial item which was supposed to showcase the modding capabilities of *Afterbirth+* in the PAX 2016 livestream. However, all items included in the demo were later added to the final game.
	+ In the livestream, Sharp Straw had the name 'Isaacula', a different appearance, and a recharge time of six rooms.
Scissors

### Collection Grid

*(page 4, column 10, row 2)**(page 3, column 20, row 4)**(page 3, column 1, row 5)*

### Unlock Method

 Die 100 times

This article is about the item. For a similar looking item, see The Pinking Shears. For the trinket, see Safety Scissors.
**Scissors** is an unlockable activated item.

## Effects

* Detaches Isaac's head from his body and turns the head into a stationary familiar that fires tears for the current room.
	+ The player still controls Isaac's headless body, which also shoots tears.
		- The body constantly spews a controllable fountain of blood shots, dealing about 0.66x-1.01x damage.
			* The blood fountain can be aimed in any direction like .
	+ The tears fired by the head do not scale with Isaac's damage and always do 3.5 damage.
		- The head's tears are affected by Isaac's stats and attack modifiers.

## Notes

* Can spawn multiple heads if used in the same room more than once.
	+ Only the most recent head is able to fire.
* and  are not fired from the stationary head.
* If Isaac has an invisible body due to the cosmetic effect of , only a shadow will be seen after using the Scissors.
* If Isaac is Blindfolded, the floating head can still fire tears.
* The floating head does nothing as  Lilith,  Tainted Lilith, and  Tainted Forgotten.
	+ As  The Forgotten, the floating head will only fire tears when the Soul is active.
	+ The floating head will not fire tears as  Tainted Samson while he is enraged.
* Each wave of Boss Rush fully recharges the item, allowing many heads to be spawned.
* Only deaths which end runs (i.e. Isaac is not revived by a revival item such as ) count towards unlocking the Scissors.

## Synergies

* : Spawns red wisps in the middle ring. The wisps fire 2-3 tears at a time, which are inaccurate, travel in an arc, and have variable range.
* / : Blood fountain from the body will aim at the crosshair.
* : Blood fountain from the body will aim at the controlled tear.

## 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.
* : The loose head won't become larger, but will deal double damage.
* : No effect.
* : No effect.

## Gallery

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

## Trivia

* This item is very likely a reference to the English idiom "running with scissors", which means to "willfully act in a reckless, foolish, and/or dangerous manner", alluding to the literal act of running with a pair of scissors in one's hand, which can cause severe injury, thus the item's effect and unlock condition.
* In original flash version of *The Binding of Isaac*, dying 100 times unlocked .
Scorpio

### Collection Grid

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

**Scorpio** is a passive item.

## Effects

* Grants poison tears, dealing damage over time when inflicted.
* The poison randomly hits either 2 or 3 times, dealing a total of 4 or 6 damage.
* The poison hits twice, dealing a total of double Isaac's damage.

## Notes

* This item has the same effect as  on every shot. As such, all synergies with that item also apply to Scorpio at a 100% chance.
	+ This includes the same effect when absorbed by .
Scolex

**Scolex** is a boss that can appear in the Womb and the Scarred Womb.

## Behavior

Scolex is only vulnerable in his blinking tail segment. He burrows into the ground before performing the following attacks:

* Jumps out of the ground towards Isaac, burrowing back into the ground at the end of the jump.
	+ If Scolex is hit by an explosion while mid-air, he will be deflected backwards.
* Partially emerges head-first and shoots out a cluster of projectiles towards Isaac, similar to Monstro, but with a wider spread.
	+ After performing this attack, Scolex will always jump out of the same spot he entered.
* Partially emerges tail-first and fires cluster of 3 red  shots towards Isaac.
	+ After performing this attack, Scolex will always jump out of the same spot he entered.

Scolex deals a whole heart of contact damage.

## Champion Versions

**Black**: Scolex is 15% larger, slower, and has 25% more HP (375).
## Gallery

* Scolex in-game.
* Scolex's tail.
* Black Champion Scolex.
* Black Champion Scolex's tail.
* Scolex as one of  Delirium's forms.
* Scolex bugged with his sprite replaced by The Frail.

## Notes

* Sometimes, several Lumps, Guts, Para-Bites, or Round Worms can accompany Scolex at the start of the battle.

## Trivia

* Scolex appeared in the original *The Binding of Isaac.*
* Scolex is the only Boss to have *lost* access to a Champion variant in an update. Specifically in *Repentance,* where his dark grey counterpart is inaccessible unless using Console commands to summon it.
* Scolex can be considered an older or younger version of Pin, but not a posthumous one (that title goes to  The Frail).
* A scolex is the name of the head of a tapeworm.
* Compared to the original *Binding of Isaac*, Scolex's head and tail attacks are swapped.
* Scolex bears some resemblance to a mythological Mongolian Death Worm, which are described as long, scaly, and blood red. It also raises half its body out of the sand and covers its prey with a lethal acidic substance, which is somewhat similar to Scolex's head attack.
Smelter

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

## Effects

* Upon use, any trinkets that Isaac is holding are destroyed, and their effects are permanently applied to him.
	+ Trinkets that are absorbed show up on the HUD's item tracker.
* Increases the chance for a trinket to drop after clearing a room. (Has a 2% chance to turn the pickup variant into a trinket.)

## Notes

* While held,  will double the effect of all absorbed trinkets (if their effects can be doubled).
* Absorbing the  will allow Isaac to pick up other trinkets again.
* Trinkets whose effects only activate once, such as , , and , will still only activate once after being absorbed.
* is still removed if Isaac takes damage from regular sources.
* cannot be used to open  A Strange Door if smelted.
* It is possible to find previously smelted trinkets during a Victory Lap, or if the trinket Item Pool is exhausted.
* Picking up a copy of a trinket which was already absorbed will not duplicate that trinket's effect.
* The trinket will not be absorbed if Smelter is activated during the pickup animation.

## Synergies

* : Spawns yellow wisps on the middle ring. The wisps have a chance to spawn trinkets when destroyed.
* : Allows a trinket to appear every time there's a room clear drop as long as the other room clear drop criteria aren't satisfied, as it empties the trinket slot.
* Tainted Eden: Absorbed trinkets are not rerolled by Tainted Eden's passive effect.
* Tainted Isaac: Absorbed trinkets do not take up an item slot.

## Trivia

* Smelter, alongside  are currently the only items that can be unlocked specifically by defeating Mom's Heart or It Lives on hard mode, playing as Apollyon.
Signs of the Zodiac

The 12 **Signs of the Zodiac** are featured as passive collectibles each with effects loosely based on their given namesake.

 Grants the effect of a random Zodiac sign each floor.

 Collecting any three items with the `stars` item tag unlocks the Planetarium.

## Unlockable Achievements

* The Planetarium - Collect any 3 items with the 'stars' item tag in a single run.

## Trivia

* Some of the effects caused by the items in-game are directly related to their astrological significance or symbol. For example, Aquarius is portrayed as a man (Ganymede) bearing water, and in game the item causes Isaac to leave a trail of tears behind him while walking; Libra, which represents weighing scales, balances Isaac's stats.
Short Fuse

**Short Fuse** is a trinket added in *The Binding of Isaac: Repentance*.

## Effects

* Bombs placed by Isaac explode in 0.66 seconds instead of 1.5 seconds.

## Interactions

* : Bombs from Dr. Fetus also explode more quickly.
* : No effect.

## Trivia

* This trinket originated in *Antibirth*, where it was originally called Exploded Firecracker.