A bright blue streak flashes from your pointing finger to a point you choose within range and then suddenly expands with a loud cracking sound into an explosion of frost and ice shards. Each creature in a 20-foot-radius sphere centered on that point 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 cold air and frost spreads around corners. It freezes water and other freezable liquids as well as douses any sources nonmagical fire in the area.

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.