血誓#569

Blood Oath is a passive item added in The Binding of Isaac: Repentance.

• This item is used in Bloody Mary (challenge #37).
• Blood Oath originates from the Antibirth mod. In Antibirth, it was possible to prevent Red Hearts from being drained while still gaining the stat increases if Isaac's speed was high enough to immediately leave the starting room. Moreover any Rotten Heart Isaac had would cause Blood Oath to remove half of a Soul Heart which would kill him if he did not have one to remove.
• This item originated from the Community Remix mod for the original Binding of Isaac game.
• The familiar appears much bloodier when a large amount of hearts are drained.

Bug! Using Glowing Hourglass to return to the previous floor twice will cause Blood Oath to activate an extra time, giving buffs corresponding to drained HP. Bug! Upon coming back from obtaining Knife Piece 2 or after defeating the Lamb and refusing a victory lap, the stat boost obtained from this item at the beginning of the floor will be gone. The Binding of Isaac: Rebirth

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