So... I started the main mission/dungeon yesterday and I am still not done. I think I'm getting close. At least the NPCs keep saying stuff to that effect. We'll see if I finish tonight or have to continue tomorrow. To be honest maybe this dungeon is a bit over the top large/long...
Or maybe it's just that I'm slow and took a wrong turn and had to retrace my steps from the beginning and it turned out the wrong turn was very near the end of my previous attempt...
I also have to leave loads of loot behind.
(Thankfully it's a lot of trinkets, gemstones and shiny, clinky gold rather than big items, but there are some of those, too.)
Edit: Nope, a bit of conversation and then overwhelming death. I might need to backtrack ("you cannot fast travel from this location") and level up considerably before I try again. On the other hand I think the enemies level with me...
Not sure how to get out of this