Etenan's Smite

You point up and hurl a streak of lightning into the air. Choose a point you can see within range. The streak of lightning soars through the air, building up energy before striking violently back down onto the surface. Each creature within a 20ft sphere centered on the point you chose must make a Dexterity saving throw. A target takes 8d6 lightning on a failed save, or half as much damage on a successful one.

If any creatures within the radius of the lightning strike are wearing a conductive material, or if the strike is made on a conductive material or water, the spell does an additional 4d6 lightning damage. If the strike is done in water or on a conductive floor, the radius is doubled.