Arctic Wrath

Your weapon exudes a chilling aura, its surface rimed with frost that drifts into the air in pale wisps.
The first time you hit a creature with a melee weapon attack on your turn during this spell’s duration, the attack deals an extra 3d6 cold damage. The target must succeed on a Constitution saving throw or have its speed halved until the end of its next turn.

 In addition, you emit an icy aura that freezes the ground within 10 feet of you. At the end of each of your turns, each creature within 10 feet of you takes cold damage equal to your proficiency bonus

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d6 for each slot level above 2nd.