Did anybode else kill Halsin, like me? Supposedly you are only "lead" to the Underdark (rather than discovering it somehow) if you take him back to the grove?
This seems like a major oversight on Larian's behalf, but I'm still not sure. If it is, I'd rather end my playthrough here and start a new one, because that is how I would have progressed, leaving through the mountain path in the NOrthwest. (I was planning another playthrough anyways).
