Crystal Nova

A bright streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of ice shards and cold energy. Each creature in a 10-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 5d6 cold damage on a failed save, or half as much damage on a successful one. The ice shards spreads around corners. It freezes objects in the area that aren’t being worn or carried. For the next hour, the area affected by this spell is considered difficult terrain.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d6 and 10-feet-radius for each slot level above 3rd.