I have two paths to take this and can't decide which one to take. Also writing here because you need to write at least a bit here or it won't send.

"Deathbride" plays more into, well, death. Emia turns inwards, creating and heading a Death Cult to embrace the inevitablity of death and accept the fact that sometimes, the holy flame is required to end another, as The Master has showcased. It'd be a subdued and down to earth kind of thing, where she wears a black dress and veil to showcase the end, and take a few other women as Deathbrides. Killing arts more fluid, precise, and ritualistic than before. The underhive is consolodated under the Cult Of The Oncoming End and rise to the surface to see it's state.

"Saint" is, as it sounds. She totally absorbs the Holy Mother and takes it further still, becoming Saint Emia in all it's worth. Blazing with holy glory and benediction, she stirs the cult into a religious fevour, to inspire and brighten the hearts of everyone. Gathering people with voice and vigor, the Underhive flocks to her to be in her light, and the Children Of The Mother surge forth from below to bring the words of the Saint to every waiting ear.