Cosmic Wraith

Void Devour: 1-3 1d6 The Cosmic wraith forces a creature to make a Constitution saving throw DC 20. On a Failed save, the creature takes 6d10 necroticdnecrotic and the Cosmic Wraith gains hit points equal to the amount dealt before resistances.

Spectral Waltz: this creature is not effected by rough terrain and can freely pass through walls, it also has resistance to non-magical damage from Bludgeoning, piercing and slashing weapons

Abyssal Claw: +8 to hit, 3d8 Necrotic damage on hit. The Cosmic wraith swipes through a creatures mortal form, 

Nebular Flare: as an action, the Cosmic Wraith can burst out a jet of super heated plasma, each creature within 30ft of the Wraith must make a Dexterity saving throw DC 25. On a failed save the creature will take 50 fire damage and 50 necrotic damage, on a successful save, the creature will take half fire damage but will still take 50 necrotic damage.

Galactic Dissonance: When the Cosmic Wraith takes damage, it can use its reaction to cause the creature that harmed it to make a DC 18 wisdom saving throw. On a failed save, the creature must drop their current weapon and it cannot be used again for 1 minute. On a Successful save, the creature does not drop their weapon and they cannot be effected by Galactic Dissonance for 1 minute.

Cosmic Consumption: (3) The Cosmic Wraith spends an action in order to consume the soul of a recently deceased creature, if it should do this, the Cosmic wraith heals to full hit points and its AC increases by 2. Any creature whose soul is consumed this way cannot be revived by any means short of a wish spell.