Mask + Heart

The Mask + Heart is an enemy commonly found in, uncommonly in /, and rarely in. Hearts may be found on their own in The Womb/Utero as well.

It consists of two parts:
 * an invulnerable mask, which uses a movement pattern similar to a Knight.
 * a slow-moving heart that will shoot 4 projectiles in the cardinal directions when the player approaches it.

Destroying the heart will also destroy the mask. If the heart is afflicted by a status effect, the mask will also gain that status effect.

Mask II + 1/2 Heart
The Mask II + 1/2 Heart is a more advanced variation of Mask + Heart that was introduced in The Binding of Isaac: Repentance.

While Mask II behaves very similarly to the default Mask most of the time, the 1/2 Heart that accompanies it behaves drastically different. As the name implies, the heart is split into 2 individual halves. Unlike the default Heart, neither half actively avoids the player and instead floats around the room somewhat erratically. While both halves are intact, they create a steady stream of blood shots between themselves acting as somewhat of a barrier between the two. Once one of the halves are destroyed, the mask becomes angry and begins moving much quicker while the remaining half begins slowly floating towards the player while frequently firing 4 blood shots in the diagonal directions. Once both halves are defeated, the Mask II dies with them.