2.5 boss spoilers, you've been warned
With the recent new revelations about Sunbringer and her relation to Banyue, I wanted to revisit these leaks for the 2.5 boss. This boss is referred to as The Creator, so it's likely the Creator just piloting Sarah's body like what happened with Ye Shiyuan at the end of 2.4. The elephant in the room here is her eyes, which are blue and orange, and the reverse of Sunbringer.
We also have these new map textures, which are apparently from a Porcelume factory or something. Now the posters are obviously Sunbringer, and look very cultlike, as if they're worshipping her. Specifically, I think the interesting thing here is the top left poster, which seems to depict a pair of hands bestowing a light upon us. The reason I think this is important is because of "Promeltus". Promeltus doesn't seem to mean anything specific, but I believe it's intended to be invoking "Prometheus", especially with the flame imagery. ZZZ is no stranger to Greek myth analogues (Phaethon), and Sun (fire, heat, life) bringer being a Prometheus analog seems feasible. For anyone unfamiliar, Prometheus was a Titan who betrayed his kind to grant fire to humanity, and was punished for it. In other words, a divine being who helped humanity. I believe, based on their similar eyes, that the Creator and Sunbringer have a common origin, whether as gods, aliens, outer dimensional beings, super AI from the Old Civilization, or something, and while the Creator stood against humanity, Sunbringer chose to help us back during Old Eridu's founding, becoming a Void Hunter in the process, and defeating the Creator back then with the help of her comrades (Swordmaster taking down the Exaltist Overseer). Her words in the old autochess event and when she meets Banyue clearly depict her as pro freedom and likely on humanity's side.
Personally, I believe the Creator and Sunbringer are both two halves of one super Skynet AI, tying back to another theory I posted here before, but the specific relationship doesn't really matter for the rest of this idea.