Tru'nembra.
Tru'nembra is the Flautist of Azathoth, meaning He plays forever within the Daemon-Sultan's court, with an interesting instrument: Himself. Tru'nembra is composed of living noise, and to summon him is to summon a cacophony of horror and fear, with soundwaves louder then ever recorded blasting off of the shimmering mass of air he would manifest in. It is thought that the only time this ever occured was around the same time the Flying Polyps broke from their prisions to wreck havoc upon the world once more.