The Library is a room added in the Wrath of the Lamb. It can appear on any floor. It contains two books, chosen at random. The room around you contains bookshelves, and the floor is similar to that of the Cellar's. It can contain any book in the entire game except The Bible .

The Library has a 5% chance of spawning, and a 25% chance of spawning if you have touched a book that is part of the pool in the run.


  • The Library can contain two of the same book; the charge of each will be equal and linked; that is, using one will use up the other's charge as well.
  • From outside, the Library's door is identical to that of the Shop's, making the two impossible to distinguish when under the Curse of Darkness.
  • Because picking up an item means it cannot ever be seen again in the same run, picking up every book that can be found in the Library will force the Library to spawn standard Treasure Room items. This can be easily abused with a combination of The Dice and the Habit.
  • The Library will not spawn the The Book Of Belial if you play as Judas. Holding the Book of Belial as Judas does not provide an increased chance of finding a Library.
  • The Library will not spawn The Monster Manuel until it is unlocked.
  • Despite being a book, The Bible is not part of the normal Library item pool.

List of Books in The LibraryModifier

Objet Icône Effet
Anarchist Cookbook Anarchist Cookbook Icon

Spawns six troll bombs around the room.

The Book Of Belial The Book Of Belial Icon

Adds 2 points of damage for the current room. Damage is further multiplied by 1.5x with the Blood Of The Martyr item. Also increases chances of a Devil Room spawning by 25%.

Book Of Revelations Book Of Revelations Icon

Adds 1 Soul Heart and makes the next boss a Horseman (except on XL Floors and on floors with fixed bosses such as Mom). Increases chances of a Devil Room spawning by 35%.

Book Of Shadows Book Of Shadows Icon

Grants Isaac invulnerability for 10 seconds.

The Book Of Sin The Book Of Sin Icon

Spawns a random Pick Up, Pill or Card.

Monster Manuel 40px

Summons a random familiar for the current room only, even if it is locked.

The Necronomicon The Necronomicon Icon

Damages all enemies in the room significantly.

Telepathy For Dummies


Gives Isaac homing tears for the current room. (Identical to Spoon Bender)



  • The Library's background music was also used for Ending 13.


30px Treasure Room · 30px Shop · 40px Secret Room · 30px Arcade · 30px Boss Room
35px Challenge Room · 40px Devil Room · 40px I AM ERROR

Rooms in the Wrath of the Lamb

30px Curse Room · 35px Sacrifice Room · 40px Super Secret Room
35px Boss Challenge Room · 25px Library · 25px Angel Room

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