Yes, I think I should start the main quest, I am also thinking of going to one of the other fortresses and begin another boss fight, as you have supposed. Maybe this also will activate the dragon stone. (?)
In my opinion, after all it is not good that the 'master' of the battle tower (the player) cannot enter the other levels of the tower via foot. The dragon stone is quite convenient if you want to enter your tower fast and teleport back at the very same place (in order to avoid travelling via teleporter) but as the only way to get to your servants it is not so good (esp. when it does not work...) I hope in further addons, etc. there is a way to travel inside the tower via foot.

Thanks for your help, Raze.

PS: Sorry for my bad English

Last edited by clueless33333; 15/06/11 10:25 PM.