I finaly got the plans and the keys for the machine. And made the machine at the blacksmith i went through the door and made the portal and messed around with the first 2 uber bosses then left to help a friend. shortly after he wanted to see it so i went back got inside the room and the portal was gone. So i'm wondering if it only works for one party then closes when you leave or if i'm doing somthing wrong.

Thanks,
Owen