Withering

You accelerate the conduction of magic through the target creature, thus hastening the decay of their soul. The target must make a Charisma saving throw. The target takes 8d8 radiant damage on a failed save, or half as much on a successful save. This spell has no effect on constructs. 

If you target a celestial, fiend, undead, or any creature bound to the Ethereal Plane or any "Afterlife", it makes its saving throw with disadvantage, and the spell deals an additional 2d8 radiant damage.

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot above 4th level.