Tempête de glace

You open a rift between the elements, pulling forth a slither of winter. A 20-foot-radius sphere fills with a blizzard, centred on a point with range and lasting for the duration. The area is heavily obscured and exposed flames inside it are doused.

The area is filled with tundra and counts as difficult terrain. Any creature that starts its turn in the area takes 2d6 cold damage. Any creature that ends its turn in the area must succeed on a Constitution saving throw or take a further 2d6 cold damage as the arctic weather begins to stiffen their bodies.