you need to kill Captain Ealsha(45) wanders around tower and Apprentice Yavim (45 caster) in the tower. then use the orb to go to top level to kill Radavex. Plus this is in the quest info page of this site.
thank you for information. Can you tell me which quest so I can look it up. Thank you again. I got it when I was doing my 30 epic quest out of castle lightwolf.
FYI: the orb rotates from the tower bottom to top. while it's at the top (u can still con it) u cannot talk to it to get quest :((. not sure how it cycles location but it's not based on time of game day.