Did you ...
Find the ranting, unconsious Fist in the Last Light Inn, and then talk to Halsin in the camp?
I'll admit I was lucky I did, as if there was any specific clue that Halsin was the person to talk to to progress that quest I completely missed it. Though I suppose, in hindsight, he is the person in our party who knows most about the curse and the history of the area so it perhaps should have occurred to me.
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"
| 
