Cold Snap (5.5e Patch)

A swirling burst of freezing wind erupts in front of you in a 15-foot Cone. Each creature in the area must make a Constitution saving throw. On a failed save, a target takes 3d8 Cold damage and have the Restrained condition until the end of their next turn. On a success, the target takes half as much damage and has its movement speed reduced on its next turn by 10 feet.

The ground in the area is covered with slick ice and snow, making it Difficult Terrain until the start of your next turn.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 2.