Backstabber
ItemAfterbirth+Unlocked
passiveGame ID 506★★★★
How do you unlock Backstabber?
Verified starting unlockSource data confirms that no unlock is required.
Isaac's tears deal double damage and inflict bleeding on enemies if they're facing away from Isaac.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Backstabber leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13