The Book of Belial

ItemRebirthUnlocked

activeGame ID 34★★★★

How do you unlock The Book of Belial?

Verified starting unlockSource data confirms that no unlock is required.

[Before Afterbirth] +2 damage for the current room. Passively guarantees a Devil Room or Angel Room will appear while held. / [Afterbirth] +2 damage for the current room. Passively increases the chance of finding a Devil Room or Angel Room while held.

Available from the start

No unlock needed — this is available in every new save file.

What unlocking The Book of Belial leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13