Cold Snap

Thin beams of blue energy spring from your fingertips. Choose up to 3 creatures within range that must succeed on a Constitution saving throw. A creature takes 3d8 cold damage on a failed save and its speed is reduced by 15 feet until the end of its next turn. On a successful save, a creature takes half as much damage and its speed is not reduced. 

At Higher Levels.  When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature for each slot level above 3rd. The creatures must be within range.