The Second Riddle Door

After digging up the box, The Black Steel moved on, Thorbeck rejoining them, bursting through a door being chased by two other skeletons, one of which Mornenion shot down. Walking further, they found another door, solid metal and with a massive lock. After some searching, Thorbeck and Mornenion noticed some glistening in the troll head totem they'd seen. Mornenion saw something in the 2nd troll's left eye and stuck his hand into it's socket, pulling out a massive key. They returned to the door and unlocked it, but as it opened some members of the company got a bad headache, all at once. With no other choice but to continue, they carried on into the courtyard through the door. There was another riddle, which required two people to use mirrors to shine light onto the back of the statue of the Witch King. And then... Mornenion doesn't want to remember this part.