There are more, but one of the most prominent examples is:
ASMODEUS /ASMODAY aka SYDONAY
Rank: King, Manager of the Gambling Houses in Hell.
Asmodeus was of the order of Seraphim and he carries the title "King of the Demons." He governs the many realms of pleasure.
He prefers to be summoned bareheaded [without a hat or head covering] and he teaches the arts of astronomy, arithmetic, geomancy, and craftsmanship. He answers all questions, discovers and guards treasures and gives the ability to read the thoughts of others. He confers invisibility, and can break up marriages/relationships.
Asmodeus has a human Mother and his Father is a God. He has jet black hair with a braid down his back, and has an olive complexion. Asmodeus is extremely courteous and very much a gentleman. He is soft spoken with a smooth voice. Asmodeus is a very pleasant Demon.
As for what happened after he was born and how he became a god that is not known.
However from what we have learned of the Magnum Opus it is most likely that he simply achieved this and ascended as a god. When we become gods we still keep our physical bodies. We don't need to die or something, we simply ascend our being.
All the gods live in the universe physically, they have physical bodies just like us and are very much alive.
It seems logical to me that when one has a god as a parent that the child which is born carries great knowledge and power from birth, because the child will have inherited the genes of a god directly, so maybe he was born an immortal and simply stopped aging at a certain point in his youth.
