Coldsnap

You choose a creature you can see within range and control the air temperature around them. You can decrease the temperature to extremely low levels as a bonus action. When you do so the targeted creature must make a Constitution saving throw, taking 5d8 cold damage on a failed save and half as much damage on a success.

At Higher Levels. 

When you cast this spell using a spell slot of 7th level or higher, you can target one additional creature for each slot level above 6th.