Ultra-Sonic Storm

You create a storm of blistering high pitched sound in a 30-foot-radius sphere centered in a point you can see within range, inaudible for most beings, but capable of damaging creatures and objects. Each creature inside the sphere must make a Constitution saving throw. A target takes 8d8 thunder damage on a failed save or half as much damage on a successful one. Any creature with a failed save is stunned until the start of your next turn and deafened for 10 minutes. 

Also each object inside the sphere with an AC of 14 or lower suffers the rolled damage.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 1d8 for each spell slot above 7th.