Library (Item Pool)

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Items in this pool can be found in the LibraryLibrary.

Activated Collectibles

Name ID Icon Weight Description
Anarchist Cookbook 5.100.65
Anarchist Cookbook
3 rooms
1
Spawns six Troll Bomb.pngTroll Bombs around the room.
The Bible 5.100.33
The Bible
4 rooms
1
Grants flight for the current room. Instantly kills Boss Mom ingame.pngMom, Boss Mom's Heart ingame.pngMom's Heart, and Boss It Lives ingame.pngIt Lives when activated, but kills Isaac when used on Boss Satan ingame.pngSatan.
The Book of Belial 5.100.34
The Book of Belial
3 rooms
1
(in Rebirth) +2 damage for the current room. Passively guarantees a Devil RoomDevil Room or Angel RoomAngel Room will appear while held.
(except in Rebirth) +2 damage for the current room. Passively increases the chance of finding a Devil RoomDevil Room or Angel RoomAngel Room while held.
Book of Revelations 5.100.78
Book of Revelations
6 rooms
1
Increases the chance of a Devil RoomDevil Room / Angel RoomAngel Room appearing while held. Upon use, gives one Soul Heart.pngSoul Heart, and replaces the boss of the current floor with a Harbinger if possible.
Book of Secrets 5.100.287
Book of Secrets
6 rooms
1
Gives the effect of Collectible Treasure Map icon.pngTreasure Map, Collectible The Compass icon.pngThe Compass, or Collectible Blue Map icon.pngBlue Map for the duration of the current floor. (in Repentance) If all effects are active, Collectible X-Ray Vision icon.pngX-Ray Vision is provided for the floor instead. Highlights any Tinted Rocks and rocks with Crawl SpaceCrawl Space in the room.
Book of Shadows 5.100.58
Book of Shadows
3 rooms
1
Creates a protective shield, nullifying all types of damage in the current room for 10 seconds.
The Book of Sin 5.100.97
The Book of Sin
4 rooms
1
Spawns a random coin, heart, bomb, key, battery, pill or card near Isaac.
How to Jump 5.100.282
How to Jump
Unlimited
1
Isaac jumps in the direction he is currently moving, allowing travel over obstacles and enemies.
The Necronomicon 5.100.35
The Necronomicon
4 rooms
1
Deals 40 damage to every enemy in the room.
Satanic Bible 5.100.292
Satanic Bible
6 rooms
1
Grants one Black Heart.pngBlack Heart. (in Repentance) Replaces the boss room item on the current floor with a Devil Deal.
Telepathy For Dummies 5.100.192
Telepathy For Dummies
2 rooms
1
Gives homing tears for the current room. (in Repentance) Also gives +3 range.
(in Afterbirth † and Repentance) Book of the Dead 5.100.545
Book of the Dead
6 rooms
1
(except in Repentance) Creates a friendly Bony.pngBony, Black Bony.pngBlack Bony, or an orbital bone for each enemy killed in the current room.
(in Repentance)Creates a friendly Bony.pngBony, Black Bony.pngBlack Bony, Bone Fly.pngBone Fly, Revenant.pngRevenant, or an orbital bone for each enemy killed in the current room.
(in Repentance) Monster Manual 5.100.123
Monster Manual
6 rooms
1
(except in Repentance) Spawns a familiar from a specific selection for the current room.
(in Repentance) Spawns a familiar from a specific selection for the current floor.
(in Repentance) Lemegeton 5.100.712
Lemegeton
6 rooms
0.2
Spawns a destructible orbital familiar representing a random passive item, which blocks shots and deals contact damage. While the wisp is alive, Isaac gains that item's effects.

Passive Collectibles

Name ID Icon Weight Description
(in Repentance) Book of Virtues 5.100.584
Book of Virtues
4 rooms
0.2
Passively causes active items to spawn themed orbital wisp familiars on use, which fire tears and block shots. Can be activated to spawn a basic wisp if Isaac has no other active item.