Arctic Smite

The target takes an extra 1d12 Cold damage from the attack due to a localized cold snap. It must succeed on a Constitution saving throw or its speed is halved until the spell ends. At the end of each of its turns, the target repeats the save, ending the spell on itself on a success.

If the target is a space with no creatures in it, the cold freezes nonmagical liquids in it up to a 5-foot cube.

Using a Higher-Level Spell Slot. The damage increases by 1d12 for each spell slot level above 1.