Please help me with the final quest.

[Nephos]

Please help me to figure this out.
I'm in front of the Crux of Ages. Then I found the main quest on my journal was gone. And I click on the Crux of Ages. Nothing happens. Is this the ending? I still stay in that chamber, and no hints about ending. I didn't go to the mage's tower to ask for help.
Is this the end? No cutscene or some conclusions?
I'm confused. Please help me.

[Nephos]

Thanks for the help. Time to try it out~