Blizzaga

Freezing hail pounds to the ground in a 25-foot-radius, 50-foot-high cylinder centered on a point within range. This Black Elemental Magic is rewarded to the bravest wizards and the cast spell causes no friendly fire. Each enemy creature in the cylinder must make a Dexterity saving throw. A creature takes 7d8 cold damage on a failed save, or half as much on a successful one. The area becomes difficult terrain until the end of your next turn.

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, the cold damage increases by 1d8 for each slot level above 3rd.