Shard of Glass

Shard of Glass is a passive item added in The Binding of Isaac: Afterbirth †.

Effects

 * Adds a 25% chance to drop a full Red Heart upon taking damage.
 * Adds a separate 10% chance to gain the effect (+5 range, red creep trail) for the current room upon taking damage.
 * Taking damage will cause Isaac to bleed, spewing red tears around him constantly.
 * Holding a direction of fire focuses the bleeding tears to that direction, with slightly increased range.
 * After bleeding for 20 seconds, Isaac's Red Hearts or Rotten Hearts will take damage (bypassing other Hearts); this is indicated by Isaac slowly turning red after and eventually blinking. This damage also has a 25% chance to drop a full Red Heart. The damaging effect will continue to occur every 20 seconds until the bleeding effect ends.
 * The damage amount is always half a Red Heart, a Coin Heart, or a Rotten Heart, even in later chapters where most damage is now a full Heart or two Rotten Hearts.
 * The bleeding effect ends when Isaac receives any form of Red Heart or Rotten Heart healing, if Isaac loses, has no more Red or Rotten Hearts, or if the next hit would kill Isaac.
 * can end the bleeding by switching to.
 * If Isaac has no Red or Rotten Hearts, the bleeding effect of Shard of Glass will not activate.
 * The bleeding effect carries over to the next floor if Isaac moves on to the next floor while still bleeding.

Trivia

 * "Blood and guts" is a term for violence, typically in fiction.
 * Prior to update v4.0.2, possessing Shard of Glass prevents the player from obtaining.
 * This may indicate that Shard of Glass was at one point planned to be a set drop from destroying the mirror.

Seeds
VYEN N8Z4 (First Golden Treasure Room) 8L1F YVFR (First floor Treasure Room)