Voltaic Pulse

You produce a pulse of echoing electric energy which whips towards a target in range. On a hit, the target is overwhelmed by the electrical energy and takes 3d6 Lightening damage. They must then make a constitution saving throw. On a failed save they are stunned until the end of their next turn and on a succesful one they are given no additional effect. 

At higher levels. Using a spell slot of 3rd level or higher, increases the damage by 2d6 per level above 2nd