It seems I was right near the end of Dungeon 3 after all. There were just a few more rooms to go through, and then the boss – a giant moth thing. The main difficulty with him, was the fact that the floor moved constantly, and there were a load of moving spikes on the floor too. I hit him a lot with the Fire Rod, although I soon ran out of magic power so had to resort to my sword. He’s dead now though. Onward!