Then, u'll find a couple of Black Ring lords, defeat them and find two black ring guys up there, they'll complain about you and you can keep them alive or kill them, i suggest you don't kill them, since they sell ubber ekips.
On the other side of the room where they stay, the one with ciew, there'll be 3 levers, they'll deactivate the anti-dragon zones, including the "invisible wall".
I kinda was stuck here for a while too, for some reason i didn't saw the levers, and had no idea it was like that i could deactivate those zones.
