The Book of Sin is an unlockable activated item.
Contents
Effect[]
- Spawns a random heart, coin, bomb, key, battery, pill, card, or rune.
- Hearts can be either full red hearts, soul hearts, or black hearts.
- Coins can be either pennies, nickels, or dimes.
- Bombs and keys will always be singular (will not spawn 1+1 bombs or key rings).
- Batteries can be mini batteries, essentially being a dud -2 charge pull.
- Each pickup seems to be equally likely, which means that there is around a 1/7 chance to get a particular type of pickup.
This item belongs to the Bookworm set. Collecting three items from this set will transform Isaac into Bookworm.
This item belongs to the In-game Footage[]
Gallery[]
3DS The icon of The Book of Sin as seen on the lower 3DS screen.
Seeds[]
PC 
2YN8 JS3R (Treasure room adjacent to spawn)
PC LP12 WXZ1 (Treasure room adjacent to spawn)
PC K6RC 1P0T (Treasure room adjacent to spawn)
PS4 1V4Q HMXN (Treasure room adjacent to spawn)
Vita W4YY DXT4
3DS ZRQY 1Y70 (First floor treasure room)
 The Binding of Isaac: Rebirth
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