THANKS FOR BREAKING MY BRAIN, SANDERSON. IT'S NOT LIKE I WAS USING IT OR ANYTHING.
Brandon Sanderson has these different standalone fantasy books/series, right? Elantris, Warbreaker, and the Mistborn books. All take place on different words, with very different magic systems that are all very detailed and almost mathematic in their precision. And some people - not me - that there was a name that kept recurring in these books, a certain character who doesn't play a large role but seems to be able to put his two cents in, and it was a moment of OMG they're all connected somehow.
Then about four years ago he came out with The Way of Kings, which is the first book in a ten-book masterpiece
A couple weeks ago the next book in the series, Words of Radiance, came out, and the book-hopping guy is back, possibly using magic from one of the other books, and one of the minor characters in WoR is a major character from a different book, and and then at the end...