Thunderstrike

You point a metal rod at a point within range and a bolt of lightning strikes the ground from the sky above. Each creature in a 20-foot-radius square centered on that point must make a Dexterity saving throw. A target takes 4d6 lightning and 2d6 thunder damage on a failed save, or half as much damage on a successful one. A target that fails its saving throw is also deafened for one minute.

It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the lightning damage increases by 1d6 for each slot level above 3rd.