Cataclysmic Sky

You summon a roiling tempest over a 40-foot-radius area centered on a point within range. The storm rages with lightning, rain, and gale-force winds. Each creature of your choice in the area must make a Dexterity saving throw, taking 4d10 lightning damage and 4d10 thunder damage on a failed save, or half as much on a success.

At the start of each of your turns while the spell persists, choose one of the following effects:

• Lightning Strike: One creature of your choice in the area takes 6d10 lightning damage.
• Gale Push: Each creature of your choice in the area must succeed on a Strength saving throw or be pushed 20 feet in a direction of your choosing and knocked prone.
• Deafening Sky: Thunder rolls deafeningly. Each creature of your choice within the storm must succeed on a Constitution saving throw or be deafened until the start of your next turn.