Thunderbird

A cloud of forking lightning and thunder fills a 30ft radius, 40ft high cylinder centered on a point you see in range. The cloud spreads around corners and remains for the duration. Its area's heavily obscured, and difficult terrain and creature are deafened while within the cloud.

Each creature in its area must make a Dexterity save when the cloud appears. A creature takes 5d6 lightning and thunder damage on a failed save, or half as much on a success. A creature must also make this save when it enters the spell's area for the first time or ends its turn there.

At Higher Levels. Each damage type increases by 1d6 for each slot above 7th.