The Illearth War.
Dunno who its by because I just started reading it, but its part 2 of the Thomas Covenant the Unbeliever trilogy (?, again). I have part 3, but I cannot find part 1 anywhere.
The cool thing is, there's a huge recap of the first book in the first chapter (And a recap chapter before that) so I don't really feel like I'm missing out on much but the juice.
It's pretty good so far and I'm not even to the part where Covenant goes to this magical land where his leprosy is cured and he doesn't believe in anything there.