You call upon the darkest energies to target the soul of a creature within range. The target must make a Charisma saving throw. On a failed save, the target takes 8d10 necrotic damage and is stunned for 1 minute. On a successful save, the target takes half damage and is not stunned. A stunned target can make another Charisma saving throw at the end of each of its turns, ending the stun on a success. Undead and fiends have disadvantage on the saving throw.