04/20/12 - I played through this dungeon and killed Vokun the Dragon Priest. When I returned, I didn't have any obstacles throughout the dungeon. Are you stuck at the circular room in High Gate Ruins Catacombs (check your local map)? There's a "gate" there, which is raised by pulling the lever until the first wall alcove appears, then pulling the lever inside. Return to the first lever, pull it again to reveal a second alcove and lever. Pull that, and the gate rises. The only other gate I can see in High Gate Ruins is the one from the throne room to the exit, but that can't be accessed until you're in Vokun's Throne Room. There are no hidden routes, aside from the puzzle I previously mentioned.