I need help with this quest. I go into the Dreamstride and my 2 "brothers" take positions on either side of a doorway. I climb the stairs but when I get to the dome-shaped object at the top, I have no way to trigger it. I wander around, following hallways, going through the dinig hall and dormitory. I keep going up as far as I can and come to hall where I get to an invisible wall and can't go any farther. I've tried toggling collision mode to see if there's something on the other side but no luck.

I'm at my wit's end and no idea what to do. Where is the trigger to release the miasma? Or have I found a bug?

I'm playing the PC version.

http://www.youtube.com/watch?v=Y0F-jGRJLRU&feature=related This vid should help more then my rather inept discription

I think it's a crystal. There should be a glowing crystal near the invisible wall you need to click on. This took me a while too and I was very frustrated...