Amperes’ Surge

As you create surge of concentrated magical electricity into an orb; send it to a target within the vicinity of the spell's range. The target of the spell takes 5d6 lightning damage and must make a Constitution saving throw, on a success the target takes half damage and suffers no additional affects. On a failure the orb persist above the target and on the start of each of its turns takes 2d6 lightning damage and must make a DC 10 flat d20 check. On a failure of this check the target is stunned for the remainder of its turn. At the end of the turn target makes another Constitution saving throw to end the spell effect. 

Creatures with resistance to lightning damage have advantage on the saving throw, and creatures with lightening immunity are not affected by this spell.