Revolvenant

Revolvenants periodically stretch their arm towards the player, attaching it to a wall. The arm will then release bullets perpendicular to itself with varying degrees of aim. They can also fire both arms at the player and encircle them, tracking them whilst firing two large mace bullets inwards first, then freezing the circle created and firing the remaining bullets at the player.

Trivia

 * The name Revolvenant is a reference to Revenants, visible ghosts or animated corpses that are believed to have revived from death to haunt the living.
 * The appearance of the Revolvenant is likely a reference to the Lich in his third and final phase.