Dregare Devil

Dregare Devils are the spies of the Demon realms, they are known to be cruel, hungry, and relentless in their pursuits. From when they first form until they are destroyed they are always working on how to improve their abilities to skin creatures. Once they have skinned a creature they are able to fit their skin over their own form in a seamless manner.
The True forms of the Dregare Devils are not known to many. They are constantly surrounded by a cloud of dark, necrotic energy. Any creature that gets close to them runs the risk of taking necrotic damage and they can also radiate this energy at will in a cloud of decay.

Dregare Devil "Skin Stealer" CR: 10

Medium devil, lawful evil

Armor Class: 17 (Natural Armor)

Hit Points: 116 (16d8 + 48)

Speed: 30 ft

STR

14 +2

DEX

17 +3

CON

16 +3

INT

11 +0

WIS

12 +1

CHA

16 +3

Saving Throws: CON +7, WIS +5

Skills: Deception +7

Damage Resistances: Cold, Fire, Lightning, Necrotic; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Damage Immunities: Poison

Condition Immunities: Charmed, Exhaustion, Poisoned

Senses: Darkvision 120 ft., Passive Perception 11

Languages: Abyssal, Telepathy 120 ft. any language its skin knew in life

Challenge Rating: 10

Innate Spellcasting. The skin stealer’s spellcasting ability is Charisma (spell save DC 15). The skin stealer can innately cast the following spells, requiring no material components:

At will: detect thoughts, shadow of moil

1/day: dominate person

Magic Resistance. The skin stealer has advantage on saving throws against spells and other magical effects.
Quick Reflexes. The skin stealer can take 2 reactions in a single round
Skin Theft. There is a 25% chance that the Dregare can steal the skin of a dead medium creature and wear its skin to appear as a creature. It remembers all of the memories of the creature and is able to mimic its personality. It makes deception checks to hide its true nature with advantage.
It uses the stats of the creature except for its constitution and hit points. If the creature has class levels it is able to assume the class levels as long as the class levels are not the following classes: Cleric, Paladin, or Warlock.
If the dregare undergoes the effect of the Moonbeam spell the flesh melts off and it loses the abilities of the skin it was wearing.  The skin will decay after 2 months of wearing it.

Actions

Multiattack. The maurezhi makes three claw attacks.
Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) slashing damage. If the target is a creature other than an undead, it must succeed on a DC 12 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Summon Devil (1/Day). The demon chooses what to summon and attempts a magical summoning.
A skin stealer has a 50 percent chance of summoning one skin stealer.
A summoned devil appears in an unoccupied space within 60 feet of its summoner, acts as an ally of its summoner, and can’t summon other demons. It remains for 1 minute, until it or its summoner dies, or until its summoner dismisses it as an action.

Reactions

Cloud of Decay. When a creature enters within 10 feet of the skin stealer, the skin stealer releases a cloud of necrotic poison. Any creature within 10 feet must succeed on a DC 14 Constitution saving throw or be poisoned and take 2d6 necrotic damage.