It followed Bran, though Will did join him a few chapters in. Bran realise time doesn't pass in the castle beyond the north wind, and basically goes off on a coming-of-age quest so he can grow up. It took some stuff from the rhamantau and Culhwch ac Olwen...they were just about to reach the Stag of Rhedenvre when I got overwhelmed with coursework and let it slide. Now, of course, I know much more than I did then, so it's the one lost fic I still intend to go back and rewrite and finish. The ending is quite different from what I'd originally planned, now that I am more familiar with the sources I'm stealing from!