Winterdark

This spell invokes the deepest part of the night on the winter solstice. You target a 40 foot radius, 60 foot high cylinder centered on a point within range, which plunges into darkness and unbearable cold. Each creature in the area when you cast the spell, and when a creature starts its turn in the area, must make a successful Constitution Saving Throw or take 1d6 cold damage and gain one level of exhaustion. 

Creatures immune to cold damage are also immune to the exhaustion effect, as are creatures wearing cold weather gear or otherwise naturally adapted for a cold environment. 

As a bonus action, you can move the center of the effect 20 feet.