Artanzar's Shadow Strike

A vertical column of darkness descends from the sky in a location of your choice. Each creature in a 20-foot-radius, 80-foot-high cylinder centered on a point within range must make a Dexterity saving throw. A creature takes 10d8 psychic damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the psychic damage increases by 1d8 for each slot level above 7th.