Dragonic 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 5d10 acid, cold, fire, lightning and radiant damage to the target. And the target has to make a Wisdom saving throw. On a fail, you gain resistence to acid, cold, fire, lighning and radiant damage for the next 3 rounds.