Originally posted by Mharr:

If it's tunnels it has to be instanced, that's just a reality of the game engine. I hope we can move in and build there though.

i think that it will be like the dungeons in black forest or in swamp... like a reskin of the dungeon with thematic tile set for mountains with a mob in it... i don't think they built an entire mechanic in the small "upcoming" update