A handful of heroes have just stolen the powerful relics of the Baleful Queen. Without them, the immortal sovereign is weakened; recovering them is now her sole purpose. With the High Mages attempting to destroy them, the heroes have fallen back into the Bastion of the Ancient Kings, where they must defend the fort to the peril of their lives. Unceasingly, the hordes led by the Warlords besiege the ramparts.