The Book of Belial

	5.100.34
	3 rooms

Not to be confused with 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.
- Increases the chance to open the Devil Room or Angel Room by 12.5% after killing a boss while holding it instead.
This item belongs to the Bookworm set. Collecting three items from this set will transform Isaac into Bookworm.

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 playing card, for example).
Unlike 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 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.

Blood of the Martyr: Causes The Book of Belial to apply a 1.5x damage multiplier on top of its normal effect. This multiplier cannot stack with the same multipliers from Cricket's Head or Magic Mushroom.

Book of Belial when activated.
Unused image for use animation. This sprite is closer to the one used in the original game, and is soon be used in the upcoming Repentance DLC.
3DS The Icon of the Book of Belial as seen on the lower 3DS screen.

PC ZWQY MQ6C

Switch ZWC9 D2WY