Also done some refining of my concept, im going for a kimbery focused Slayer, sea-knight hellstrider pilot.
A Tya who exalted as a infernal, in time convinced kimbery that the lintha had betrayed her with their weakness and many failures, and that the Tya would love her more. Then corrupted them into the service of Kimbery, and wiped out the fallen lintha as proof of their devotion. Naturally, the death of the lintha pirates was seen as a great achievement, and she was heralded as a hero, few beyond the Tya knowing that she was in fact, 'anathema' though she had long since spread the tale that the whole 'anathema' myth was just some realm hypocrisy, meant to cover up a long ago betrayal. And who could deny her after her heroism? Next, of course, she began a campaign to 'free' the West from the volcano gods, and though it took some delicate work, she was able to turn the Tya on the Storm Mothers too.
The net result was that she (along with her circle) rose high in Kimbery's favour, corrupted the Tya into a Kimberian cult, and built them into a force comparable to the first age Lithina, as she armed them with hellforged technology and demonic foot soldiers, and defeated the major deities in West, securing it almost exactly on the eve of the Reclamation its self, though her circle didnt participate directly in the event.