I could walk you to him in game, but describing the path is kind of hard unless you really know FT (in terms of paths/boss pops), I'll give it a shot though:
Basically, there's a room right past the corner where you first fight gargoyle mobs (where you can fall into lava). In that room you can either go left, right (to the garygole and main bosses) or straight. Go straight, and youll end up at a ridge with some *really* tight pulls, go down into the room (should have piles of gold everywhere, and a ton of mobs you can sneak around). Once you get to the gold room you should see him in the back.
I know that's confusing as hell (I'm going off memory >.>;
I'll try to find a proper map once I get home.