Necromorphs

Information: 

Necromorphs are beasts created by those considered masters of magic to hunt down those with either a rich soul connection or a rich spirit, in addition Necromorphs are created by placing an “Empty Spirit” within a dead corpse and them grafting the outer skin of a Demon upon the corpse to act as their armour, finally the creator will place The Necromorph under a strong control spell which places them under their command.

Typically Necropmorphs are found in the underground bases of long dead magic users and only abandoned ruins where their masters have died, they will continuously hover over their masters corpses until some brave hearted explorer, beast hunter or beastologists comes to collect them for one reason or another.