Blizzard

You create a freezing cold blast in your hands and release it with an explosion of ice, snow and hail. Each creature in a 20 foot cube must make a Dexterity saving throw. A target takes 8d6 cold damage on a failed save, or half as much damage on a successful one.

The ice spreads around corners, freezing any nonmagical water it comes into contact with.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.