Not positive but the area that contains the dire ice worm at the entrance might have a small issue: a mountaineer ranger couldn't camouflage there (or creep into the room) despite the worm itself being camouflaged.

Mobs can camo/hide/etc in places where players can't if they are reset that way...once pulled out of camo it won't be able to go back however.

So long, and thanks for all the fish!