You conjure a howling blizzard of swirling clouds of ice and snow which fills a 30-foot-radius, 40-foot-high cylinder centered at a point you can see within range. The area becomes heavily obscured and difficult terrain. Any creature that starts their turn within the area or enters it for the first time during the turn must make a Constitution saving throw. A creature takes 6d8 cold damage on a failed saving throw, or half as much on a successful one.