Hasoofuhgnoth

Hasoufuhgnoth (hɑːsuːfuːnɑθ), The Impulsive One, The Ignorant Voice, a Yagathian spirit of impurities and corruption.

He plays an unknown instrument that sends telepathic messages to any living being making them into his slaves.

Then Hasoofuhgnoth built enormous structures in the Dark Abyss and also entertained the Demon Lord.

This didn't last very long because of his wretched and traitorous behavior against anyone who stood in his way.

Mythology
"'He plays his harp tempting the mortals to sin through dark songs...Hasoofuhgnah with his writhing tentacles meticulously hits every note with exactness and such patience...'"

Hasoofuhgnoth was talented in playing any musical instrument that was given to him by the Fallen Gods and word many mortals to their downfall.

Once he even put Ayathogoth to sleep with his soft drumming and chanting about the triumphs he will endure throughout his demise.

Then after the Fallen Gods raided the Universe enforcing the inhabitants into worshiping them he took an opportunity to make his move on the different worlds.