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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.

Notes

  • 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.
  • If you go to the library, use the two books and then take back your The Dice and reroll them, different books will appear. If you have taken every book of the game, treasure room items will start spawning. This can be easily abused with The Habit, 9-Volt and The Battery to have a lot of Active and Passive items.

List of Books in The Library

Item Icon Effect
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 Monster Manuel Icon

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

Telepathy For Dummies Icon

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

Gallery

Trivia

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


Rooms

Treasure room icon Treasure Room · Shop icon Shop · Secret room icon Secret Room · Arcade icon Arcade · BossRoomIcon Boss Room
Challegne room icon Challenge Room · Super secret room icon Devil Room · Super secret room icon I AM ERROR

Rooms in the Wrath of the Lamb

Curse room icon Curse Room · Sacrifice room icon Sacrifice Room · Super secret room icon Super Secret Room
Boss challenge room Boss Challenge Room · Libary icon Library · Angel room icon Angel Room

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