Tsathogga utters a blasphemous croak audible to all creatures within 300 feet of it. Those that can hear it must make a DC 24 Wisdom saving throw. On a failed saving throw, the target takes 28 (8d6) necrotic damage and 28 (8d6) thunder damage and is stunned for 1 minute. On a successful saving throw, the target takes half damage and is not stunned. A stunned creature can repeat the saving throw at the end of each of its turns, ending the effect on a success.