Bass Boost

A sudden loud rumble emits from a point of your choice within range. Each creature within a 15ft rafius must make a constitution saving throw. A creature takes 4d8 thunder damage is deafened and knocked prone on a failed save. On a successful save a creature takes half as much damage and isn't knocked prone. At the end of each of its turns a creature may make a constitution saving throw, on a success the deafness ends.