Coldsnap

You conjure a small pocket of winter's most freezing winds at a point within range. Creatures in a 15-foot sphere centred on that point must succeed on a Constitution saving throw or take 2d12 cold damage and have their speed reduced by 10 feet until the end of their next turn. On a successful save, a creature takes half as much damage and isn't slowed. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d12 for each slot above 2nd.