This seems bass ackwards to me... after I complete a dungeon, there's no way out and I have to run all the way back through to the entrance, where I find a portal, which taks me back to the far reaches of the dungeon only to make me run all the way out again.
That's crazy! Shouldn't the portal appear at the end of the dungeon, making it easy to get back to the entrance/exit? Or am I just not seeing the purpose of these portals?