Yenma's Lightning Surge

Choose a point within range that you can see. Energy gathers at the point creating an electrical discharge. Any creature within a 20ft sphere centered at the chosen point must make a Dexterity saving throw versus your spell DC. (Creatures Holding or Wearing Metal have disadvantage) On a failed save the affected creatures take 26(4d12) Lightning damage and are stunned until the end of their next turn. On a successful save the affected takes half damage and no stun.