Blizzard

A flash echoes from your extended hand to a point you choose within range and then blossoms with a low blast of Ice. Each creature in a 30-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 5d10 cold damage on a failed save, or half as much damage on a successful one.

The 20-foot sphere becomes difficult terrain.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.