Tempest

The skies above churn with clouds as dark as the night. Pillars of tempestuous lightning erupts from the sky, draping the ground at four different points you can see within range. Each creature in a 40-foot-radius cylinder centered on each point you choose must make a Dexterity saving throw. A creature takes 20d6 Force damage and 20d6 lightning damage on a failed save, or half as much damage on a successful one. A creature in the area of more than one lightning burst is affected only once.

The spell damages objects in the area and ignites flammable objects that aren't being worn or carried.