Devour

Channeling the power of a lost god, the user devours every aspect of their target's existence to fuel their strength. The targeted creature must make a Dexterity saving throw. On a failed save, they will take 8d8+5 necrotic damage and the caster will be healed for half of the damage dealt. On a successful save, the targeted creature will take half damage and the caster will not be healed at all.