[daan]

There's a really big talking head in the dungeon.
(when you enter, first door to your right, straight trough that room and then again straight on, you'll see it)
Answer its riddle, using the scrolls of paper
(there are three). And you'll get another item
(maybe another roundie-thing part, dunno).
Anywaym as long as you cover each centimeter of the dungeon, you should be fine.
(of the three shadow-doors, ONE you canNOT open.
Move around this one, via the bridge before the door, there's a fire-pit after the bridge, and another room in the north-right corner of the fire-pit, where you'll find another piece of paper)
After that go down to the south-right corner and enter the room there. Another quest awaits, you'll find the required item in the dungeon too.