Demizen Wraith (5e Creature)
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Medium undead, neutral evil
Damage Resistances acid, cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered
Ethereal Sight. The wraith can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.
Incorporeal Movement. The wraith can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Undead Fortitude. If damage reduces the wraith to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the wraith drops to 1 hit point instead.
Detect Life. The wraith can magically sense the presence of living creatures up to 5 miles away that aren't undead or constructs. The wraith knows the general direction they're in but not their exact locations.
Multiattack. The wraith can make two Life Drain or two Strength Drain attacks or one of each.
Life Drain. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 22 (4d8 + 4) necrotic damage. The target must succeed on a DC 16 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
Strength Drain. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 11 (2d6 + 4) necrotic damage, and the target's Strength score is reduced by 1d4. The target dies if this reduces its Strength to 0. Otherwise, the reduction lasts until the target finishes a short or long rest.
Possession (Recharge 6). One humanoid that the wraith can see within 5 feet of it must succeed on a DC 16 Charisma saving throw or be possessed by the wraith; the wraith then disappears, and the target is incapacitated and loses control of its body. The wraith now controls the body but doesn't deprive the target of awareness. The wraith can't be targeted by any attack, spell, or other effect, except ones that turn undead, and it retains its alignment, Intelligence, Wisdom, Charisma, and immunity to being charmed. It otherwise uses the possessed target's statistics, but doesn't gain access to the target's knowledge, class features, or proficiencies.
Create Specter. The wraith targets a humanoid within 10 feet of it that has been dead for no longer than 1 minute and died violently. The target's spirit rises as a specter in the space of its corpse or in the nearest unoccupied space. The specter is under the wraith's control. The wraith can have no more than seven specters under its control at one time.
Wail (1/Day). The wraith releases a mournful wail, provided that the wraith isn't in sunlight. This wail has no effect on constructs or undead. All other creatures within 30 feet of the wraith that can hear the wraith must make a DC 16 Constitution saving throw. On failure, a creature drops to 0 hit points. On a success, a creature takes 10 (3d6) psychic damage.
Replicate. As an action, the wraith can take on 1 trait or 1 action from an undead creature with 0 hit points within 5 feet of it. The wraith can have a maximum of Charisma modifier traits and Charisma modifier actions replicated in this way. All DCs gained from traits or actions are Charisma based. Innate Spellcasting and Spellcasting can not be replicated.