The Harmonizer

Description
This strange item looks like a trumpet welded onto a crossbow stock. Three times per day, flipping the switch on the bottom makes the Harmonizer violently blast everything in a 30ft cone with random fluorescent lights and ear-splitting noise. The flashing lights are harmless, but any creature in the area will take 5d6 Sonic dmg and is Deafened for 2d6 rounds. A Fort DC 19 save negates the deafness and reduces the damage by half.

However, firing the Harmonizer requires the wielder to pass a DC 12 Str check or be thrown back 1d6x10 ft. If this takes the wielder into a wall or other solid surface, they will take 1d6 Bludgeoning dmg for every 10ft increment after the first. In addition, if they fail the Str check by 10 or more, the Harmonizer will fly out of the wielders control and wildly fire all its remaining charges in a 30ft radius.