Buran Smite

The next time you hit a creature with a weapon attack before this spell ends, the weapon releases a gale of biting wind as you strike. The attack deals extra cold or fire damage to the target equal to your spellcasting ability modifier. In addition, each creature in a 15-foot cone must make a Dexterity saving throw. A creature takes 2d6 cold or fire damage on a failed save, or half as much damage on a successful one.

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.