Rathma

From Diablo Wiki

Rathma is a Nephalem and the progenitor of the Priests of Rathma, also known as the Necromancers. He is the son of Lilith and Inarius.

Personality

He is not at all in good terms with his parents, as Lilith destroyed the rebel angels and demons only to use the Nephalem's power for her own ends.

Only the first generation of Nephalem (Rathma and Bul-Kathos) kept their powers.

Rathma became the disciple of Trag'Oul (depicted as a dragon made of stars living in a void dimension). Their goal is to keep the Balance between the Burning Hells and the High Heavens.

Rathma is the one guiding Mendeln in his initiation. Mendeln and his brother, Uldyssian eventually meet Rathma and Trang'Oul. Rathma and Uldyssian went to the Worldstone to change the inner workings of it; to free the power of the Nephalem. That was what Lilith had originally intended to do, but Uldyssian managed to actually change the way the Worldstone works.

At the end of the second book of the Diablo trilogy, Rathma and Trag'Oul now know that the High Heavens have discovered Sanctuary. And to them, the angels are no better than the Burning Hells.