Definitely a spoiler..
I've done everything there is to BE the Nerevarine. I have also killed the 2 Dagoth's that had Sunder and Keening. I also have Wraithguard. Now I'm right by Dagoth Ur, outside the ruins. Im trying to get inside his lair, but there looks to be no door that I can open. Wtf? I checked on my map, and I see the door leading inside, but from the outside, it just looks like a sphere and nothing more. Is there some sort of switch or button there needs to be pressed or what? Help plz.