Kiss of The Vargouille

5th-level necromancy; Classes Warlock 5, Wizard 5

Casting Time: 1 action
Range: Touch
Components: V, S
Duration: Concentration, up to 1 minute

This horrific spell forces a temporary change in a Large-sized or smaller humanoid creature you touch, causing its head to tear free from its body and attack your enemies.

The target must make a Constitution saving throw. If it fails, it becomes incapacitated and its head rips free of its body and transforms into a vargouille—a bat-winged, undead severed head. Each round, as a bonus action you can mentally command the severed head to fly at a speed of 20 feet, or you can mentally command it to attack another creature you can see. The vargouille makes a melee weapon attack using your spell attack modifier. If the vargouille hits, it inflicts 1d6 piercing damage plus 3d6 poison damage. The head is AC 12 and has hit points equal to your spellcasting modifier plus your character level. If the head sustains enough damage to drop it to 0 hit points, the spell ends immediately and the target creature is restored to normal with its head intact once more.

The target of this spell can attempt a Wisdom saving throw at the end of each of its turns, with success ending this spell, causing the vargouille to fly back to the body and restoring the head to its body, intact. Any damage the vargouille suffers does not affect the target creature.