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you pick up a codex from the dead scientist type dwarf guy cant remember his name but it has the solution, you pick up up if you deactivate all levels of the fade then go through a door on the left of the red barrier blocking you to the forge but its really easy to guess as theres only 24 possible combinations.
thats the guy darion, his corpse is over the bridge and turn left through the door if you are coming from the switch room. also theres a secret door i didnt know about which is just to the right of you when you enter the forge room which has the last golum notes