Celestial Storm

Immense celestial lightning pummels the earth at 4 points of your choosing. Each creature in a 40-foot-radius sphere centered on each point you choose must make a Dexterity saving throw. The sphere spreads around corners. A creature takes 30d6 lightning damage and 10d6 thunder damage on failing the save, or half that on a successful one. A creature in the area of more than one blast is affected only once.

Creatures affected by the spell who fail their saving throw are knocked prone, and repelled 10 feet from the point of origin of the blast.