Pyramid Head

Pyramid Head is an enemy added in Revelations Chapter Two.

Pyramid Head
Pyramid Head will have a barrier around himself when there are other enemies in the room, making him invincible. While he is invincible, he will very slowly follow the player, and occasionally make all enemies in the room fire a single homing tear towards the player. When all other enemies die, Pyramid Head's barrier is dispelled and he will begin to cry and run away from the player, occasionally shooting a tri-shot of tears at the player.

Trivia

 * This enemy's name is likely a reference to Pyramid Head from the Silent Hill franchise.