In the level GATES OF MORIA you have to fight goblins through the path. At the end of the level you have to fight THE WATCHER. The trick is to keep going forward towards him until you can't go anymore. He will take out his tentacles. They will hit you once. Then, quickly go and cut one of his tentacles. His head will come up from the water. Quickly take out your bow and shoot him once. He will go back into the water. Repeat this step until you kill him.