Kuva, the Soul Wraith (5e Creature)
From D&D Wiki
Kuva, the Soul Wraith
Large aberration, chaotic evil
Saving Throws Str +6, Con +6, Dex +6, Int +6, Wis +6, Cha +6
Zealot Plating. If Kuva takes damage, her armor class is increased by 1 until she finishes a short or long rest.
Soul Shackles. Kuva can afflict creatures with Soul Shackles, while afflicted a creature can not walk more than 60-feet away from Kuva, and takes 1 damage at the beginning of each of their turns, this damage ramps up the longer a creature is afflicted by Soul Shackles, for example a creature afflicted by Soul Shackles for one round will take 1 damage at the beginning of their turn, but a creature afflicted by Soul Shackles for 5 rounds will take 5 damage at the beginning of their turn. When a creature takes damage from Soul Shackles, Kuva regains health equal to the amount of damage dealt. A creature afflicted by Soul Shackles can make a DC 14 Wisdom saving throw, a DC 16 Strength saving throw or a DC 18 Dexterity saving throw at the start of their turns to attempt to escape the Soul Shackles. A remove curse spell casted on an afflicted target ends the effect early. The Soul Shackles appear as the shadow of an ethereal chain, that latches onto the afflicted creatures neck. A creature charmed by kuva is immune to soul shackles
Contagious Psychopathic. If a creature spends more than 1 minute speaking with Kuva or listening to her speak, the creature must make a DC 17 Wisdom saving throw with disadvantage, creatures immune to being charmed automatically succeed, if the creature fails, they are charmed by Kuva, they listen to any commands Kuva speaks to them, as if under the effects of the "Dominate Monster" spell, and begin to see the world the way she does. Everything becomes cheery and joyful, for example blood may become melted chocolate or icing, skulls may be beach balls, and any creature who isn't charmed by Kuva, appears as horrid wilting creatures, long arms and legs, jagged teeth, burned and hairy skin, and bright red eyes. An affected creature can try and convince others that the world is much more beautiful this way, and can charm other creatures for Kuva if they spend a minute speaking with them. A creature charmed this way can not be saved unless by a remove curse spell or they are knocked unconscious.
Mark of Death As an action, Kuva marks a target, within 30 feet for death. If the creature is knocked unconscious, they instead rise back to their feet at 1 hit point, and are charmed by Kuva as if effected by Contagious Psychopathic. Afflicts Soul Shackles.
Flawed Willpower. Kuva can siphon the life of any creature charmed by her, teleporting to their space and taking their form, gaining full control of them and access to all traits and features it has. Kuva can not be removed from the target unless the magic she uses to control them is dispelled, a remove curse spell is casted, or the creature she is inhabiting falls unconscious.
Slash. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 5) slashing damage.
Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 27 (4d10 + 7) necrotic damage. Afflicts Soul Shackles.
Multiattack. Kuva makes two Slash attacks and one Bite attack.
Fan of Blades. Ranged Weapon Attack: +6 to hit, range 60/120 ft., three targets. Hit: 8 (1d8 + 4) piercing damage plus 8 (1d8 + 4) necrotic damage. Kuva may then teleport up to 10 ft away from any of the targets hit. Afflicts Soul Shackles.
Wraith Blood. As a reaction to being attacked Kuva may choose to force the creature to make a DC 16 Wisdom saving throw, on a successful save the attack hits and Kuva is stunned until the start of her next turn, on a failed save the attack misses and the attacker is stunned until the end of their next turn as Kuva jets herself through them and re-appears up to 10 ft in a place around the creature. Afflicts Soul Shackles.
The Soul Wraith can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Kuva regains spent legendary actions at end of a short or long rest.
Aberrant Nature. Kuva casts greater invisibility on herself. The spell lasts until Kuva takes damage.
Kuva Creature Table (d12)