Azure Smite

The next time you hit a creature with a weapon attack before this spell ends, the weapon glows with an orange outline and a blue flame coats it as you strike. The attack deals an extra 2d6 (1d6 fire, 1d6 ice) damage to the target, which must make a constitution saving throw or they are stunned for a round by the cold flame that just hit them. 

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