I have a long series that I have planned that all takes place in the same fantasy-based place. I want to have different characters for each book, different conflicts, way different time periods, etc. Right now I have the whole history of the world I set up, from creation to the latest time period of a book in the series. There are a few books that I have planned for the series that all take place in different time periods. For example, one explains how magic came to being, and another takes place before magic was discovered. The biggest thing I'm worried about is making the evolution from one book to another that takes place in the future realistic. Any tips, or book series that does this successfully?