[Spoilers for Main Campaign]
So I killed the Green Dragon and got the last(?) Jewel in the Crown. Journal now says "Return to Manacalon Ruin".
Upon entering the ruin, I get a massive boost to Masgarth relations (for literally walking into the area), and there's a brief cutscene where the Crown-bearer says something about "We Have a Problem." but it's not clear what the problem is. It's just the ruin as you left it, nothing seems to be different. Except now we can't sense any gems. But you thought you could sense one in a place you'd been to before, but now you can't because ..why?
The quest gets updated with "Return to the Council.".
What was the point of this journey? There are no decisions to make, no discoveries. Nothing. You literally turn around and leave again. Seems like there should have been _something_ to do in the ruins. Or just cut this waste of time out of the game and make it so that you can't sense any more gems after you get the last one.