Death's touch

You penetrate the mind and soul of one creature and fill them with darkness, sorrow, and anger, causing them to wither away. The target must make a charisma saving throw. On a failed save, the target takes 8d6 necrotic damage and has disadvantage on all rolls for the next five minutes. On a successful save, the target takes half as much damage and has disadvantage on the next roll.

The spell can only be used once per long rest.