Stephen King's Dark Tower series is my go-to epic fantasy. I'm about to start a 4th trip to the tower once I'm done with my current listen.
Enders Game by Orson Scott Card, and a select few other books in the series (Speaker for the dead and Enders Shadow most notably) - Card at the top of his game is fantastic, I just wish he didn't dive completely off the deep end.
Tangentially, Berserk, if you include manga. Hands down my favorite piece of media altogether.