- Marrow was added in Booster Pack #5, after the initial release of the DLC.
- Marrow and Smelter are currently the only items you can unlock from defeating Mom's Heart or It Lives on Hard Mode.
|The Forgotten Unlocks|
|Mom's Heart Unlocks|
|It Lives Unlocks|
|The Binding of Isaac: Rebirth|
|Achievements||Attributes||Bosses||Cards and Runes||Challenges||Chapters|