I wonder if any of you have read the Ink Heart series. It's a few years old by now. But the premise is interesting and if you look deeper into it the basis of the entire series is a rather thought provoking one.

Not to spoil too much but it's a meta story. The first book in the series is a title used within the series and is the start of it all. And the premise then brings forth the concepts of transportational equivalent exchange and our world being a multiverse composed of books, and each book is a seperate universe. Taking this outside it's parental narrative, you have to consider not only the truths of this when considering the fact of there being crossover series which happen between other authors and even the same author and their different works. It's a strange way to think of it, but in a sense every author with an actual story is a god of a small world. Through the use of words and text they created a world.

And that in and of itself could be the source of a story. A self aware world within a book. Sort of. They understand the name of their god in some abstracted way and their holy writs are all about how on what day what was created, and how and the way it's explained. How artists are like gods or demigods peering in through a lense to see what the author described, what they thought this character was supposed to look like.

However based upon this it brings forth the possibility of cross mechanic world's with characters that go between. Which could cause interesting and broken things to happen, but when done it can provide a basis between the mechanics of different worlds. If an author can do it properly, between a standard fantasy and technology or xianxia it can be the basis for this again in the future, and every story building upon the base concepts, so long as they fit within it naturally and with a balance, it can fit within the balanced mutliverse narrative mechanic blending. Which is a rather groundbreaking thing.