There was an area with no roof, big waterfall. No spawns.
There were maps with Duergar that affected Nym adversely.
There were maps with vampires in them and an ancient wyvern as well that affected him I think. Its a very long trip and it was on and off so much that its not really possible for me to give you the list unless I go back down there and take note of each area piece by piece (need a group or a GM to port me around)