Archibald's Static Burst

You point to a location in range and a bright flash an zapping noise happens as a burst of crackling lightning burst out. Each creature in a 20ft radius sphere entered on chosen point must make a constitution saving throw against your spell DC. 

On a failed save - creature(s) take 6d6 lightning damage and become stunned for 1 round (stun ends when it becomes the caster's turn again)

On a success save - a creature takes half damage and is not stunned

when casting at higher levels - increase damage by 1d6 for every spell level above 3rd.