Asmodeus

Lord of the Ambitious
The dark god Asmodeus is the Archduke of the ninth hell Nessus, and overlord of all the other layers. With an iron fist he holds the powers of the fiendish devils in check to his will. But it was not always so, before he assumed divinity, he was an angelic servant of another god, now known only as

He Who Was.

A god of the sky and peace, one who wanted to uplift the mortals of the material realm to greatness through kindness. But the Dawn War was not kind, and He Who Was would not help in the fight, it was against his very nature.

And it burned at Asmodeus's soul, that they would stand idle as others fought. And when the fighting was done, Asmodeus was assigned a task to guard a unnatural creature of unthinkable power who was imprisioned in the Abyss. And there he plotted the downfall of his master, and created the weapon to murder a god, his ruby scepter.

When he returned he rallied his followers and rebelled, striking his master down with his new power forged from the raw heart of evil in the abyss. Before he fell, He Who Was cursed Asmodeus and his followers, turning them into devils and dragging them down into the Lower Planes, bound to the nine layers through which they fell. So great was Asmodeus's anger that he banished everything of his former master through the planes, even his name is no longer known.