The Death Gate Cycle by Tracy Hickman and Margaret Weis. It's a bout a war between two races of demigods, the Sartan and the Patryn, that ends with one race being imprisoned (The Patryn) in a world called the Labyrinth and the original world is sundered into four different worlds based on the classic four elements. The Sartan mysteriously disappear shortly after and as time passes, the Patryn begin to escape the Labyrinth. The seven books revolve around the Patryn Haplo's journey through the four worlds. It's a lengthy series but one of the few that actually kept my interest.

I usually hate reading fiction, especially fantasy and sci-fi works but this one actually came off well written and was one of the few fantasy stories that didn't reek of a Tolkein or D&D influence. It still has elves, dwarves, humans, and dragons but they come off a little more original to some extent.