Chromatic Smite

Harnessing the power of the dragons, you imbue your weapon with their chromatic damages.

The next time you hit a creature with a melee weapon attack during the spell's duration, the weapon shimmers in multiple colors as you strike. The attack deals an extra 4d6 acid, cold, fire and lightning damage to the target. 

For each level above 4th that Chromatic Smite, an extra 1d6 of damage is added.