My humble opinion is, I reccomend you start the same way many real-life cultures for divination. Take an object. A cool object, maybe a mirror, maybe a ring, maybe some cards. Assign them significance, and boom. Also, make sure to give the object of divination different possible outcomes. That's...
Hey, everyone. I'm EchE8 (which doesn't mean anything, btw, it's just a random string of letters I typed for a username.
I'm a writer of horror and fantasy stories, and in the past, I've mostly written and published shorter fiction, ie short stories and novellas, and more in the horror genre...
I like the concept of this world, especially the classical inspiration for aesthetics and culture, as well as what seems to me like the historical influence of the ancient mediterranean world. It doesn't really seem particularly medieval to me, though, so I'm confused as to why you used that...
I really like the concept you've got working here. These types of epic, cosmic SFF settings are hard to pull off, but it seems that you've got a fine start.
In particular, something that draws me in is the moons and their falling, and the upheaval that comes after them. Epic stories like this...