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So. I just ran into this glitch as well, while still in the ritual room I logged out of eso and back in. For me that fixed it, the skull was on the podium and I was able to take it and exit the “cave” Good luck.
3/7/2025 Same deal, nothing happening in the Cursed Skull Chamber, no undead popping, cannot reset ritual cylinders. Finally I stepped outside the room and engaged the small named that was too sleepy or slow to bother with previously. Once this named died, I was able to re-enter the ritual cylinder room and freely engage the undead, reset all 4 cylinders, and finally gather the Golden Skull. It appears that sneaking past some bad guys roils quest sensibilities - seen that before.
We have closed this topic as it was originally created in January 2021. In many cases, it's better to create a new thread on a topic that you want to discuss as opposed to bumping one that is rather old.