Originally Posted by The Red Queen
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.
Maybe Halsin could use an exclamation mark to let people know he has new quest dialogue? I talked with Halsin in the Shadow Cursed Lands before reaching the sleeping man, and Halsin discussed the curse and Thaniel. When the sleeping man mentions Thaniel, there is a dialogue option about Halsin, and if you select it, the woman next to the sleeping man says to bring Halsin there.