It'll likely be a roleplay. I like to test the waters, anyways. Sort of like an interest check. My concept is that the night sky of this world is dominated by really bright stars, of multiple colours. The strength of this visual image has been in human minds since before writing. They would look to the stars, and wonder at the amazing lights that seem to form around hues. They gave the stars names, and told stories about them. Constellations were kingdoms, and each star was that kingdom's greatest heroes. The idea is this. One star in the Kingdom [aka, "constellation"] Azure, may have many stories about it. Some cultures may talk about a story where they call that star Asmos, and he was a great warrior. In another culture, they may call that star Lenale, and it was a woman with an epic of her own. But all of these are seen as correct. Studying the stars has revealed that each of those stars are, of course, suns much like our own, with planets and moons circling them. They believe that each of those stars has life on them, with heroes and warriors. And so that star, sometimes called Asmos, sometimes Lenale, sometimes something entirely different, is a representation of the different heroes who have lived on the planet around that sun. That each of them are true. Different epics of different people who at separate times in that sun's world's history, saved it from destruction and became the new embodiment of the sun.
It is believed now that someday, our own world will face a similar destruction. And that from us, someone will absorb the power of the sun [from which all magic comes from] and save everyone while sacrificing themselves. The sun will be reborn and the world will live on, but the person will die. At that point, our sun will become one of those coloured stars. The actions and personality of that hero will determine the colour of the sun and that will determine what kingdom we become apart of. What "constellation" we become apart of. So essentially there are two kinds of suns in the universe. Regular suns, which have never had a hero. These suns look like our own. Then there are the brilliant suns of colour. The purple stars, the green ones, the red ones, the pink and so forth. Each of these forming kingdoms based off their colour. I image there being only four or so true kingdoms. And that on the planet of this story, there would be real world models of those kingdoms. So there would be a constellation known as the Azure Kingdom, the Emerald Empire, the Umber Empire, and maybe something like the Magenta Kingdom. You get the point. And that on our planet, the one in the story, there would be a real world kingdom or empire based off those constellations or "sky kingdoms". Pretty much modeling their kingdom off these fictitious stories, much like many old world kingdoms in real life try and make a link to religious stories or mythology. Claiming connection to the Greek Gods in the city of Athens, Emperor of Japan having divine blood, etc. Here, the stars are the most powerful deities. It is how kingdoms have crafted their moralities, and their traditions. Off the ancient oral stories of these stars. Each star, each hero of these distant legends, often represent something. Many towns may have a single star they model themselves after. So on the planet [let's call the planet Asteria for now], in their Azure Kingdom, they may have many cities and towns that worship or model themselves after stars within the Azure Constellation or SkyKingdom.
The conflict I'm thinking of would have to do with the constellation that isn't seen. The Lightless Stars, similar to black holes, but different. This is the universal enemy and the great conflict that stars eventually face, either creating a hero that saves them and places their planet in the History of Stars, or becoming a Lightless Star themselves. I imagine it working similar to an invasion, though. Oh, and there's a moon that has cycles that wax and wane over the course of twenty year periods, where each twenty years, for two days, the moon actually breaks Asteria's atmosphere, over a desolate continent/island no one lives on any more, because of the storms that happen when the moon reaches that low. The moon breaks the atmosphere, but never touches the surface, right around that island. It lasts two days, before going back up and restarting the twenty year cycle of rising and falling throughout the year, gradually getting closer before doing it all over again. When it breaks the surface over this island, it generates a great storm, whose effects are felt all over the world. No one sails for those two days, anywhere.
I'm figuring out how to streamline and make the idea easier to understand, but that's the rough concept so far of what I have in mind for the setting.