Chromatic Smite

The next time you hit a creature with a weapon attack before this spell ends, you choose acid, cold, fire, lightning, poison, or thunder. Your weapon explodes with the chosen damage type when you strike. The attack does an extra 3d8 of the chosen damage type to the target.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d8 for each slot level above 2nd.