Stuffu

I have cleared all three levels but when going back to "top level" from outside fog of war, loot and enemies are all back. The reason I went back is because the door to the frozen dwarves never opened so I couldn't complete Garodh's Chorus. Since everything respawned I thought I could give it another try. Still the door doesn't open and also all autosave and quick saves fail to load. The funny thing is when trying to load a save it shows another loading screen than for Durgan's Battery. Anyway, I'm stuck. I can't load any saves and continue the game. I have one save game that loads a cleared "Great Hall" but then the door to the key for the armory door is stuck. Since I guess I'm stuck here, is there a way to receive the last helmet piece with a console command, or even better "hack" a locked door to open somehow. My skill is too low to open even with Mechanic scroll. Tried uploading a save game file but it's too large.

Restarted the mines again and still no sigil of the sword. Also, maybe something that's intended but when completing the white forge, Durgan's Battery completely resets with all loot, fog of war and enemies back in action.

Either it's not in the Workshop at all, i reloaded the autosave from beginning of mines and it wasn't in the there, or it's supposed to be found later in the game.

In the mines at Durgan's Battery the sigil of the sword is missing. I can't recall that I ever picked it up but but it's certainly not in the place it should be, the top left corner of the workshop. How do I get around this!? I could start over from the mines autosave but I rather don't. Unless I'm completely wrong where I should find the missing piece it's clearly a bug.