You create a 20-foot-radius sphere of pale gray, snowy fog centered on a point you choose within range. The fog spreads around corners. It lasts for the duration or until a strong wind disperses the fog, thus ending the spell. Its area is heavily obscured.
When a creature enters the spell's area for the first time on a turn or starts its turn there, that creature must make a Constitution saving throw. The creature takes 5d8 cold damage on a failed save, or half as much damage on a successful one. In addition, a creature that fails its save has its move reduced by 5 feet until the end of its next turn.
The fog moves 10 feet away from you at the start of each of its turns, rolling along the surface of the ground. The vapors, being heavier than air, sink to the lowest level of the land, even pouring down openings. The vapors also freeze any open areas of liquid they come into contact with.
At Higher levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.
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