Dungeon Keeper 2 Walkthrough: Elmshadow = 'Fear': 5
This level is interesting, introducing prisons and skeletons. You need to build a large skeleton army so they can attack without fear of being killed. This is pretty easy - take over the prison you find, get guys dragged into it, and when you have enough skeletons, send them at the fear traps to destroy them. Dig everywhere - there are lots of little nooks with treasures in them. Build bridges to find secrets.
Dungeon Keeper 2 Walkthough Index