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Marrow item
Marrow is an unlockable passive item in The Binding of Isaac, added in the Afterbirth+ DLC.
Description
+1 
Bone Heart.
Spawns 3 Red Hearts.
Note
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.
How to unlock?
Defeat Mom's Heart or It Lives! on Hard Mode as The Forgotten.
Item pools
Marrow can be found in the following item pools:
| Name | Weight |
|---|---|
| Boss |
1.0/1.0
|
| Greed Boss Room |
1.0/1.0
|
| Ultra Secret Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| nolostbr | Unavailable for  The Lost after obtaining  Birthright. |
Special synergies
The following special synergies and interactions for Marrow have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Abyss | Spawns a light grey locust that has a chance to shoot 2-3 bone projectiles upon impact with an enemy. Each bone projectile deals damage equal to the locust's damage. |
* Note that not all possible synergies and interactions are listed here.
Internal item description
Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.
Marrow
• +1 bone heart
• Spawns 3 red hearts when picked up
• Abyss: x1 bone locust .75x Isaac's damage
External links
- Check out the item description on the external Isaac Wiki.
Marbles 
Mystery Egg 
Flat Stone 
Slipped Rib 
Hallowed Ground 
Pointy Rib