Uh well...
I am basing the universe of the Cosmere and slowly making it my own, but the gist is that the universe is full is these layers or other realms sorta stacked on one an other, like the first image. Travel is sometimes permitted sometimes not. I can't describe the next bit yet, so the second image is vaguely what the separate realms look like. The center sphere is where people can travel from one set of realms to another. Realms can shift and move.
so that is the basic universe, now for the magic. The idea is that each layer/realm has a certain amount and kind of power. when a realm moves it alters both the world it leaves and the world it joins.
So that is the premise.
Yeah, I have specific book ideas but i want to know if that is good.