You emit a targeted burst of intense sonic energy at a creature within range. The target must make a Constitution saving throw. On a failure, they take 3d8 thunder damage and become stunned for the duration by the intense sound. On a successful save, the target takes half as much damage and isn't stunned. At the end of each of its turns, the target can make another Constitution saving throw. On a success, the spell ends, on failure, they take an additional 1d8 thunder from the echoes within their mind.