Grymforge bug:
I defeated the Duergar before freeing Nere, and I was able to convince him to let the Gnomes go free. Thereafter, I went for a long rest and when I returned all the bodies from Grymforge were gone. Nere and Gnomes were also missing.
Moreover, even though Nere survived, the journal has a note saying that he died. My companions are also saying we should slice his head off.
Oh yeah, ALL NPCS HAVE VANISHED FROM GRYMFORGE. Not a single one is left, including Philomeen, that I was going to meet next.