I've tried dying to reset, but it spawns me back at a Rune Trial. I'm stuck on the 'Find the exit portal markd by the UAC' objective, but I can not get to that part of the level at all.
I have spent almost 90 minutes running around the first half of the level looking for a way to progress and there is absolutely no way that I can find to get to my next objective because that big door could only be opened once. After clearing the demons I somehow backtracked to the beginning of the level to find a missing collectible.but now I can't get back through the door.
Once I went through the big door, it closed behind me and there was a fight with a bunch of demons. On Kadingir Sanctum at some point beyond the blue skull door, I hit a switch and opened another big giant door that was up a small staircase.