Corpse Pile

Terrifying Screech: Once severely damaged (half HP), the tormented faces of the corpses face out from the center and scream, fearing anything in 20ft. (DC14 WIS)

Corpse Blast: On Death (0 HP) the corpse pile explodes sending body parts and other viscera everywhere in a 10ft radius, damaging anything with that range for 1d4. Oddly enough this is a relief to those affected and they immediately heal for 1d4.

Writhing Mass: The Corpse Pile, whether with purpose or by chance, shakes out a corpse at the start of its turn, lowering it "hitpoints" and creating a zombie. (consumes ten hp to summon, cant be used beneath 10hp)

Return Essence: The Corpse Pile calls on some power from a necromancer to bestow life, or undeath if you are feeling spicy, to a recently deceased undead entity (not defeated by radiant or crit). It can do this once on each turn with no limit for uses.