The Book of Belial

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Item icon
Item altar
 
 
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Character appearance
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3 rooms 3 rooms
 
Item Pool Library.png Library
Item Pool Devil Room.png Devil Room
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 Devil Room.png Devil Room
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Added in Afterbirth (page 1, column 14, line 2)
Removed in Afterbirth (page 1, column 4, line 4)

Not to be confused with Satanic Bible Satanic BibleSatanic Bible Icon.png6 roomsUpon activation, Isaac gains a black heart..

The Book of Belial is an activated item.

Effect[edit | edit source]

  • Increases damage by 2 upon use for the current room.
  • Guarantees the Devil Room or Angel Room to spawn after killing a boss while holding it.
    • Added in Afterbirth Increases the chance to open the Devil Room or Angel Room by 12.5% after killing a boss while holding it instead.
  • Added in Afterbirth † This item belongs to the Bookworm set. Collecting three items from this set will make Isaac occasionally fire tears out of both eyes.

Notes[edit | edit source]

  • Judas starts with this item by default.
  • The Book of Belial cannot open Devil Rooms in The Basement I / The Cellar I, nor in Chapter 5 and beyond, even though they can reached by other means (through the Joker JokerJoker Icon.pngTeleports you to the Devil Room or Angel Room. playing card, for example).
  • Unlike Goat Head Goat HeadGoat Head Icon.pngA Devil Room / Angel Room Door will always spawn after every boss fight, excluding the first floor and floors after Utero II/Womb II., picking up The Book of Belial after killing the boss won't open the Devil/Angel Room Door.
    • The Book of Belial increases the chance of a Devil/Angel Room Door to spawn, while Goat Head Goat HeadGoat Head Icon.pngA Devil Room / Angel Room Door will always spawn after every boss fight, excluding the first floor and floors after Utero II/Womb II. forces open a door to said rooms permanently.
  • The damage bonus does not stack with multiple uses in a room, or with the tarot card XV - The Devil, which has the same effect.

Synergies[edit | edit source]

  • Blood of the Martyr Blood of the MartyrBlood of the Martyr Icon.pngIncreases Damage by 1, and turns Isaac's tears into blood tears.: Causes The Book of Belial to apply a 1.5x damage multiplier on top of its normal effect.
    • The x1.5 damage multiplier does not stack with the x1.5 damage multiplier from Cricket's Head Cricket's HeadCricket's Head Icon.pngIncreases damage by 0.5, and multiplies it by 1.5x. or Magic Mushroom Magic MushroomMagic Mushroom Icon.pngIncreases all stats and enlargens Isaac..

In-game Footage[edit | edit source]

Gallery[edit | edit source]

Trivia[edit | edit source]

  • Can still open Angel Rooms even though it is a satanic book.
  • It is one of the four books in the Satanic Bible.
  • Belial is a name used for Satan in some Jewish and Christian texts.

Seeds[edit | edit source]

 PC  ZWQY MQ6C

 Switch  ZWC9 D2WY


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