Tempest Charge

You teleport yourself to an unoccupied space you can see within range. Immediately as you disappear, you are transformed into a bolt of lightning that travels the most direct path in a straight line to your destination. Each creature in the path of this bolt must make a Dexterity saving throw, suffering 2d8 lightning damage on a failed save, or half as much damage on a successful one. 

When casting this spell at 3rd level or higher, the damage increases by 1d8 for each level above 2nd.