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I was on a run and entered a devil room, for 2 red hearts was a black book with a pentagram on it. I didn't want to sacrifice the 2 hearts for an item I didn't need or possibly didn't want.

Does anyone know what it does?

3 Answers 3

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Its the satanic bible, on usage, gives you a black heart

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If you mean this one:

enter image description here

it's the Satanic Bible, and gives Isaac a black heart when used. A behaviour similar to the Book of revelations.

It's an evil item, so probably it increases the chance of spawning a devil deal room.

Source here.

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  • That ain't no red pentagram in (on) my book. Commented Nov 11, 2014 at 11:38
  • Your comment means no sense to me, because the OP says "was a black book with a pentagram on it". I don't read anything about red pentagrams.
    – pinckerman
    Commented Nov 11, 2014 at 11:39
  • Question title does, though. But I see your point. Commented Nov 11, 2014 at 11:40
  • You're right, I'll change my answer.
    – pinckerman
    Commented Nov 11, 2014 at 11:41
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There are two books with pentagrams in the game.

If the book has a black pentagram on it, it is the Book of Belial. It's a 3-room charge, and gives you +2 damage for your current room. It also has the nice bonus of giving you a 100% Devil/Angel room chance, and all Devil/Angel rooms stay open forever.

If the book has a red pentagram on it, it is the Satanic Bible. It's a 6-room charge, and gives you one black heart on use.

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