Mosura the Grave Conductor

"We loved whatever Mosura created, but it brought us to tears. I voted to see him gone." Sig Elivian, Classmate of Mosura

Mosura the Grave Conductor, is an ancient bard. He began as a funeral bard and then grew to appreciate the art of death. The makeup of the bodies, the belief that we could process with an act, the music of a dirge.
He experimented for years, creating instruments and songs that defiled the minds of those who heard. He destroyed villages. His songs, while full of power had no real purpose.
Eventually, this brought him in contact with a creature out of this world. A creature offered him this: no man would sing a song at his wake if he served.
Mosura agreed, his creations would now be for a greater call. He would have power over the magical elements of art and his songs would have a purpose. He would command an orchestra of order, an orchestra of death. The Grave Conductor. He would be the greatest musician.
But, who was his patron?