A series of six barriers were put in place to prevent entry into the tower. To successfully gain entry to the tower, all wards required keys. Opening each barrier gave a limited amount of time to open the next, as each would reactivate after a short time.
Upon his death in the Year of the Dusty Throne, 1256 DR, the tower became his tomb. His nine apprentices warded the entire tower to prevent intruders from disturbing the first Open Lord's final resting place.
Only fifteen years later, in the Year of the Shattered Wall, 1271 DR, Melkar of Mirabar attempted to breach the tower's defenses. Thereafter, his skeleton hung outside of the tower as a warning to others who would try to breach the tower.