Blizzard

You create a 30-foot-radius and 40-foot-high cylinder storm of freezing winds centered on a point you choose within range. The storm's area is heavily obscured.

When a creature starts its turn there, that creature must make a Constitution saving throw. The creature takes 3d8 cold damage on a failed save, or half as much damage on a successful one. While inside the area of the storm any large or smaller creature's movement is halved unless it have immunity to cold damage or the restrained condition.

At the start of each of your turns the storm moves 10 feet in a random direction.

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 level above 5th.