Daxanthor's Riders on the Storm

At the end of each of your turns a bolt of lightning strikes your location and you ride it into the ionosphere. At the start of your next turn, and when the spell ends the lightning bolt strikes again and you ride the lighting to an unoccupied space within 10 ft. of the space you vanished from (must be a different space than the one you left).  If no unoccupied space is available within that range, you appear in the nearest unoccupied space (chosen at random if more than one space is equally near). Each time the bolt of lightning strikes all creatures in a 5 ft. radius must make a dexterity saving throw. A creature takes 1d6 +  your spellcasting modifier lightning damage on a failed save.  You can dismiss this spell as an action.

When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d6 for each slot above 6th.