The Imperial forces led by Gaius have begun to move against the castle of Avalon. As such Arawn decides it is necessary to form an alliance with the neighboring Brigantes Tribe. However, when they arrive they meet Taliesin, and it emerges that the Brigantes Tribe's Chief is dead and there is no successor to take his place, because of a prophecy claiming that the next Chief will "...offend the Heavens...be cast into the Darkness...and be devoured by a monster...".

Having reunited at Palladium, Arthur and Arawn along with the rest of their party enter the tower and prepare for what they hope will be their final battle. However, no sooner do they enter than the group are separated. Octavia and Morgan find themselves in an arena where they must face off against an army of Golems. Llyr and Rathty stumble upon the Cauldron of Rebirth and decide to try and destroy it. Finally, Arawn, Arthur, Ogam and Riannon find themselves facing off against a resurrected Drwc.