Cone of Icy Breath

As an action, you can use your lips to exhale a 15-foot Cone of icy breath. Each creature in that area makes a Dexterity saving throw, taking 3d6 cold damage  on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 2.