Skinstealer (5e Creature)
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Medium undead, lawful evil
Skills Deception +5, Insight +2, Stealth +4
Multiattack. The skinstealer makes two melee attacks.
Scimitar. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) slashing damage.
Steal Skin (Recharge 6). The skinstealer targets the intact corpse of one Small or Medium humanoid within 5 feet of it, then magically becomes an exact duplicate of the targeted creature as it was when it died, gaining access to its knowledge but not its class features, if any and leaving behind a skinless corpse.
Skinstealers are horrific undead monstrosities that wear the skins of their victims like a living humanoid wears clothes. Skinstealers are callous and detached, though they falsify emotions such as joy and anger, and though a skinstealer feigns life, its body is always deathly cold, so it avoids touching others whenever possible.
Unliving Impersonators. It is often hard to tell a skinstealer that "changes" its outfit regularly apart from a regular, living humanoid without the assistance of magic, but the flesh a skinstealer wears decays, albeit more slowly than ordinary flesh, so those that seek to discover a potential skinstealer within their ranks find that they must wait for it to out itself. A skinstealer that desires to hide its presence must kill sooner or later or it will inevitably be discovered by the stench of rot around it, but one that kills indiscriminately and doesn't take precautions to cover up its murders will likewise be discovered.
Undead Nature. A skinstealer doesn't require air, food, drink, or sleep.