Blizzard

You lift your hands into the air and a flash of blue covers your eyes before dissipating into the the breeze. The air grows violent and intensely cold as icicles begin manifest and whirl violently in the area. You create a 20-foot-radius, 10-foot-tall cylinder of raging icicles, the area becomes difficult terrain. Each creature that starts their turn the blizzard must make a dexterity saving throw. A target takes 3d6 cold damage on a failed save and is restrained until the start of it's next turn, or half as much on a successful one and is not restrained. The whirling icicles spread around corners and freeze all non magical liquids.

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