Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Not to be confused with 15►Satanic Bible Satanic Bible.

The Book of Belial is an activated item.


  • Gives +2 damage for the current room.
  • Removed in Afterbirth 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%.
  • Added in Afterbirth † This item belongs to the Bookworm set. Collecting three items from this set will transform Isaac into Bookworm.


  • Judas Judas starts with this item by default.
  • Removed in Repentance The damage bonus does not stack with multiple uses in the same room or with XV - The Devil XV - The Devil.
  • Added in Repentance Additional uses in the same room or combined with XV - The Devil XV - The Devil give +1 damage per use.
  • While activated, switching items will end the bonus damage effect.
  • If the Added in Afterbirth †15►Schoolbag Schoolbag and a second activated item are held, the book must be equipped in the primary slot to receive the Devil/Angel room bonus.
  • Removed in Afterbirth Only guarantees Devil/Angel Rooms on floors that they can normally appear on, and, unlike 15►Goat Head Goat Head, picking up The Book of Belial after killing the boss will not open the Devil/Angel Room door.


In-game Footage[]



  • 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.
  • Added in Repentance This item is used in Bloody Mary (challenge #37).



Switch ZWC9 D2WY

The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets