I made it to the last battle in mirror lake. I died and came back in. You don't let anybody port back to your partner or anybody that is in there with you. It would let me get to the second portal that is the green blinking thing after the second fight. It does not work.I could not go any farther or port to the people i was in there with. Nor could I go back. had to port out. You need to fix some of this stuff. 1. let people port to one another in a dungeon. 2. fix that portal to let one go back through the game and catch up. when you are in a dungeon, let people port to each other. not that silly there busy signal. Gee your in the same dungeon. Please fix it...
You should be able to port into any dungeon, regardless if you were there originally. A lot of times people have been willing to help me but could not have. There is no point in making some dungeons "busy".