Vaporous Smite

The next time you hit a creature with a melee weapon attack during this spell's duration, your weapon flares with a misty white shroud and the attack deals an extra 3d8 radiant damage to the target. Immediately after the attack, your form turns into a gaseous vapor and you are able to travel up to 15 feet without provoking attacks of opportunity. You return to your normal form at the end of your turn.