Priestesses are women selected from ordinary mortals, sometimes without their consent. Divine poison is infused into their veins, which greatly changes them. In the future, they can evolve into demons of Ceraria.
The Northerners have become so full of atheism that they extinguish divine influence simply by their presence, and the harsh living conditions have made them giants.
And the Ammurtians are just weaklings who believe that strength lies in technology, and that physical basis is not important when you have mega-armor and a mega-gun.
On the other hand, I also considered the priestesses as an in-game guild for female characters. So there is no definitive end point anywhere.