I read Tad Williams book The Dragonbone Chair. It's the first in the epic trilogy that made Williams famous. The king who united the continent is dying, and with his death comes incredible change - for good or bad? There are multiple main characters ranging from the kings sons to a young castle scullion. The enemies are expected, but also unseen.
As with any epic series, the author can be a little long winded. It doesn't hurt Williams in this series though. The first book sets the stage for what's going to become quite a tale in the next three books(took two parts to finish the last book). The trials are not all that common to the fantasy story, but align more closely than Glen Cook's epics. It's a great series, and definitely work picking up.
Rating: 6 caffeinated beverages - I can't give this more b/c the rest of the series gets better. (Another group of books he's written are also take the top rank)