Tormented Soul (5e Creature)
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Medium undead, chaotic evil
Damage Resistances acid, cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered
Incorporeal Movement. The tormented soul 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.
Necrotic Aura. At the start of each of the tormented soul's turns, each creature within 5 feet of it takes 3 (1d6) necrotic damage. A creature that touches the tormented soul or hits it with a melee attack while within 5 feet of it takes 3 (1d6) necrotic damage.
Life Drain. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 11 (2d10) necrotic damage. The target must succeed on a DC 12 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
Necrotic Breath (Recharge 5-6). The tormented soul exhales shadowy energy in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 18 (4d8) necrotic damage on a failed save, or half as much damage on a successful one.
Tormented souls are desolate wretches that resemble charred skeletons with neither legs nor a head, instead floating and looking through a pair of red orbs that float within their ribcages, which look as dark as the night. They think nothing of what they do, so long as they cause misery and destruction. They are constantly surrounded by and can emit a deathly black fog that causes those slain by it to rise as undead minions, and a vile touch that drains both life and soul.
Undead Nature. A tormented soul doesn't require air, food, drink, or sleep.