Actually, what they really need to do is add WotG maws to both Beaucedine and Xarcabard already.
We're told that VNMs only appear in areas with Cavernous Maws. Maws were then added to the Crag areas, leaving the Northlands the only areas that have VNMs but no maws.
It's either that or fix Assai Nybaem's dialog.