Aurorasphere

A ball of water and ice shoots from your pointing finger to a point you choose within range and then blossoms with a low roar 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.

The ice spreads around corners. It freezes objects in the area that aren't being worn or carried.

All creatures that fail the Dexterity saving throw must also make a Constitution saving throw or be Restrained until the end of your next turn.

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.