Dissonant Whistle

You whistle at a pitch so high that only five creatures of your choice within range can hear, wracking them with terrible pain. The targets must make a Constitution saving throw. On a failed save, it takes 6d8 thunder damage, is deafened, and falls prone. On a successful save, the targets take half as much damage, isn't deafened, nor fall prone. A deafened creature automatically succeeds on the save.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.