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Can't find the boulder with the blue insignia by it to use secret dagger pass on.
This question / problem has been solved by ShadowWulfeimage
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paul7475:
http://arwym.com/dl/Arx%20Guide_12-02-2003.pdf

Page 48 of the PDF. Use a light spell for help seeing it, I remember it was kind of a pain in the ass. Also, I'm not sure if you have the key object. Dunno how far in the game you are.