Shard of Glass is a passive item in The Binding of Isaac, added in the Afterbirth+ DLC.

Grants a 25% chance to drop a full Red Heart upon taking damage.

Taking damage causes Isaac to bleed and constantly spew out red tears around him. The direction of the bleeding can be influenced by holding a fire button, which will slightly increase its range. It can also be pointed diagonally.

After bleeding for 20 seconds, Isaac will take half a heart of damage, but only red hearts and rotten hearts are affected. This damage also has a 25% chance to drop a red heart.

The damage over time effect will continue every 20 seconds until the bleeding is stopped by receiving any form of red heart or rotten heart healing. Eternal hearts also work.

Bleeding will also stop if Isaac has no more red or rotten hearts, or if the next bit of bleed damage will kill him.

The bleeding effect of the item won't activate if Isaac has no red or rotten hearts.

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.

Shard of Glass can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Shard of Glass have been documented.

* Note that not all possible synergies and interactions are listed here.

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.

Shard of Glass

• 25% chance to spawn a red heart when damaged
• Taking damage will make Isaac gush blood tears
• Every 20 seconds while bleeding, lose 1/2 red heart
• Running out of red hearts or healing red hearts will stop the bleeding
• Abyss: x1 bleeding locust .75x Isaac's damage

• Check out the item description on the external Isaac Wiki.