Withermancer

The Withermancer is a Dungeon Mob rarely encountered in The Catacombs - Floor IV and above. It takes 80% reduced magic damage and has 2 orbiting skulls around it that seek out nearby players, dealing massive damage if the skull connects you. If you kill the Withermancer before it's skulls hit you then they will despawn.

Trivia

 * The orbiting skulls of the Withermancer appear to reference the Bloons Tower Defense 5 Glaive lord's 4th tier upgrade on upgrade path 1 to have 2 orbiting glaives dealing immense damage to anything that touches them.