Ecorche

When a necromancer has need of a versatile agent to serve as a bodyguard and do their bidding in disguise, they build an ecorche-a skinless monstrosity filled with putrid alchemical agents, covered in pulsing muscle and sinew grafts, and imbued with razor-sharp claws. The ecorche uses its claws to flay its victims, stripping off skin in seconds. It can then horrifyingly squeeze itself into the stolen skin and impersonate the deceased, which it does to covertly carry out orders or find more victims to expand its collection. If its deception is uncovered, it shreds its disguise, bursting forth in terrible skinless form.