A piece of paper with text on it, and blood dripping off the lower right edge.
Turns Isaac's body black, giving him small horns, and makes him seem more aggressive.
- Picking this item up and going down to 0 heart containers will kill Isaac, even though he will have 2 Soul Hearts.
- As with all items that turn Isaac black/demonic, having an item which allows flight (Dead Dove, Holy Grail, The Bible, etc.) will grant Isaac wings.
- The Pact seems to be signed in blood. In satanic rituals, a contract with a demon is usually signed with its conjurer's blood. See also: Pacts with the Devil.
- When playing as ???, if you have three Soul Hearts and take The Pact, you will have two soul hearts remaining, but will still die. If you have Scapular and 3 soul hearts, it will not kill you.