The Book of Belial

Not to be confused with Satanic Bible.

The Book of Belial is an activated item.

Effects[]

Gives +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%.
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 damage bonus does not stack with multiple uses in the same room or with XV - The Devil.
Additional uses in the same room or combined with XV - The Devil give +1 damage per use.
While activated, switching items will end the bonus damage effect.
If the Schoolbag and a second activated item are held, the book must be equipped in the primary slot to receive the Devil/Angel room bonus.
Only guarantees Devil/Angel Rooms on floors that they can normally appear on, and, unlike Goat Head, picking up The Book of Belial after killing the boss will not open the Devil/Angel Room door.

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 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.
3DS The icon of the Book of Belial as seen on the lower 3DS screen.

PC ZWQY MQ6C

Switch ZWC9 D2WY