It consists of an invulnerable mask, which uses a movement pattern similar to a Knight, and a slow moving heart that will shoot projectiles in the cardinal directions when the player approaches it. The Mask itself is vulnerable to The Necronomicon.
Masks are invulnerable and move randomly around the room, charging towards Isaac when he stands in front of them. Their behavior is quite similar to the Selfless Knight enemy.
Hearts try to move away from Isaac, and fire 4 blood shots in cardinal directions whenever he gets close. Hearts do no damage on touch. Killing a Heart will also kill the Mask it is accompanied with.
Tiny Hearts are spawned by the Carrion Queen's Pink Champion Version. They act exactly the same, although they have low HP and move much faster than normal Hearts.
If these are attacked, the Carrion Queen loses small bits of health.
- A boss variant called the Mask of Infamy can be encountered in the first floor in Necropolis. She has a similar mechanic to this enemy. However, the heart will shoot in eight directions and the Mask will not die with the Heart, but continue to fight until it is destroyed by repeatedly shooting its backside.
- Despite both the Hearts and the Masks being able to float, they cannot float over rocks and pits.
- Even though the Mask seems to be immune to all forms of attack, the Blood Rights item can destroy the Mask even if the Heart remains. Same goes for The Necronomicon.