Marrow
ItemAfterbirth+Locked
passiveGame ID 541★★★★
How do you unlock Marrow?
In The Binding of Isaac, Marrow is unlocked by earning the Mom's Heart or It Lives! completion mark as The Forgotten (Character) on hard mode.
Structured pathSource-backed requirements are mapped into trackable steps.
Grants one Bone Heart and spawns three Red Hearts.
What unlocking Marrow leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13