Boreal Storm

A 15-foot-radius, 50-foot tall cylinder of raging blizzard springs into existence centered on a point you choose within range. The cylinder remains for the spell’s duration. Each creature in the cylinder when it appears or that ends its turn there must succeed on a Constitution saving throw or take 3d6 cold damage and 3d6 bludgeoning damage. A creature takes half as much damage on a successful save. The cylinder's area is difficult terrain and heavily obscured.

At the start of your turn, you can move the cylinder up to 30 feet to a point you can see within range.

Creatures within 30 feet of the cylinder have disadvantage on Wisdom (Perception) checks made to listen.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the cold damage increases by 1d6 for each slot level above 4th.