Heartbeat
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Heartbeats are heart-like enemies found in Utero that will chase after Isaac and periodically inflate and deflate as they move. While inflated, they move slightly slower, but will scatter 5 clusters of blood projectiles nearby with each beat if attacked. The more damage they take while inflated, the more projectiles are fired out with each beat, from 2 up to 5.
They will also take 1.5× the damage while inflated, and if killed in this state, they will violently explode into a large cloud of blood projectiles in all directions and create a small pool of red creep. These projectile can deal 6 damage to other enemies.
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