Book of Revelations

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Item icon
Item altar
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6 rooms 6 rooms
Item Pool Treasure Room.png Treasure Room
Item Pool Library.png Library
Added in AfterbirthGreed mode onlyItem Pool Treasure Room.png Treasure Room
Added in AfterbirthGreed mode onlyItem Pool Library.png Library
Added in AfterbirthGreed mode onlyItem Pool Angel Room.png Angel Room
Table dividing line 3.png
Added in Afterbirth (page 1, column 15, line 4)
Removed in Afterbirth (page 1, column 5, line 8)
The Book of Revelations Defeat a Harbinger for the 1st timeThe Book of RevelationsThe Book of Revelations

The Book of Revelations is an unlockable activated item.

Effects[edit | edit source]

  • Grants a soul heart upon activation.
  • Increases chance for a Devil/Angel Room Door to open by 35% if held while killing the Boss of the floor.
    • Added in Afterbirth Only increases the chance by 17.5%.
  • If The Book of Revelations is used at least once in a map, there is a higher chance that a Harbinger will replace the normal level boss:
  1. Famine in Basement / Cellar
  2. Pestilence in Caves / Catacombs
  3. War in Depths I / Necropolis I
  4. Death or Conquest (if unlocked) in Womb I / Utero I

Notes[edit | edit source]

  • Set bosses (Mom, Mom's Heart, It Lives, Isaac, ???, Satan and The Lamb) cannot be replaced by the Book of Revelations.
  • Only the first Boss of an XL floor is affected.
  • Book of Revelations won't replace the boss on double sized boss rooms, like Double Trouble rooms or if the boss is Mr. Fred.
    • Furthermore, if the Book of Revelations is used on Caves I with a Double Trouble room, Pestilence won't spawn there, neither on Caves II. It is wiser to not use it on this floor until you can see the Boss Room shape.
  • If a Harbinger has already been fought in the current environment (e.g. if you activate the item in Basement II having fought Famine in Basement I) the boss will also not be replaced.
  • Keeping The Book of Revelations until Chapter 4 (and more specifically, aquiring it on Chapter 1 by resetting the game until acquisition) is one of the methods to unlock achievements related to Super Meat Boy and Super Bandage Girl. Said method is explained in detail here.
  • This item can replace the boss even after Isaac initiates a battle with a normal boss and then teleports out before the fight is completed.

In-game Footage[edit | edit source]

Gallery[edit | edit source]

Trivia[edit | edit source]

  • The Book of Revelation (note the lack of an "s") is the final book of the Bible. It depicts the apocalypse through a vision shown to John of Patmos and includes the Four Horsemen and themes of Hell, Satan, and The Lamb. This explains why using it causes the next boss to be a horseman, as well as why it increases the chances of a Devil Room.

Seeds[edit | edit source]

 PC  3C6Z 880R (Treasure room adjacent to spawn) Normal mode only

 PC  9867 22FF (Treasure room adjacent to spawn)

 PC  42ZY EYNS (Treasure room adjacent to spawn)

 PC  6A7C BBKN (Treasure room adjacent to spawn)

 PC   PS4  BQ7G DLKQ (Treasure room adjacent to spawn)

 PS4  G98Z MNSS (Treasure room adjacent to spawn)

 Vita  RKV8 O883

 3DS  GKM3 XJJ0 (Treasure room adjacent to spawn)

 Switch  V10Q 3WX1 (Starting item as Eden)

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