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
Devil Room Devil Room
Library Library
Greed mode only Devil Room Devil Room
Greed mode only Library Library
Greed mode only Treasure Room Treasure Room
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Added in Afterbirth(page 1, column 14, row 2)
Removed in Afterbirth(page 1, column 4, row 4)

Not to be confused with Satanic Bible Satanic Bible.

The Book of Belial is an activated item.

Effect[edit | edit source]

  • Upon activation, it gives Isaac +2 Damage 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 transform Isaac into Bookworm.

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 be reached by other means (through the Joker Joker playing card, for example).
  • Unlike Goat Head Goat Head, 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 Head 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.
  • Switching items break the bonus damage effect.

Synergies[edit | edit source]

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]


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