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I have a similar question; I can't get past the Spirit Gates either. However, the quest still shows the city of Ur-Shaks as unconquered. I think I've been to all the gates and captured everything I could, although I didn't collect the Moon Disc.
What is this city of Ur-Shaks, and do I need to find it separately, or is there something else I need to do?
Please help, if anyone knows.