Cryoball

A dull sparkle shoots forth from your pointing finger to a point you choose within range and then blossoms with a high screech into an explosion of ice. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 cold damage on a failed save, or half as much damage on a successful one. All creatures hit must make a DC 13 CON saving throw. On a failed save, the creature is stunned for 2 of their turns.

The frost spreads around corners. It extinguishes flaming objects 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.