Soul Locket is an unlockable passive item added in The Binding of Isaac: Repentance.
- Black Hearts give the same stat boosts as normal soul hearts.
- Soul Locket only activates when picking up actual Soul Hearts, not if they're directly added to Isaac's health (such as by a Balls of Steel pill or Book of Revelations).
- This item gives stats when adding to Bethany's soul charges.
- This item is useless for Keeper, since he cannot encounter soul hearts.
- Hearts acquired prior to picking up Soul Locket will not provide stat boosts.
- If Soul Locket is removed (such as with Tainted Isaac), stat boosts will not be removed.
- This item is the soul heart equivalent to Candy Heart, and gives twice as many stats per heart collected, comparatively.