Cole's Shadowball

Shadows twist and form into a ball that screams away from your finger to a point you choose within range and then cascades into the anithesis of an explosion of light, cold shadows fill the area. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d4 cold damage and 6d4 radiant on a failed save, or half as much damage on a successful one.

The shadows spread around corners and snuffs out any light it meets.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 cold and 1d4 radiant for each slot level above 3rd.