After you go in the top room and the voice says lovis is nearby, there is a corpse half buried under on of the 4 statues. loot him and get a scroll. read it and a lever will appear.
also, when you get the orb and go down to kill the ghost, after the weapons come down there is a skill book you can choose stuck in the wall back by where you teleported in at. choose that instead of the weapons
