Around the time of Princess Mithian's visit, Agravaine bribed Eoghan, the mapmaker's apprentice, to steal the plans of the siege tunnels from his master's possession. However, the apprentice failed to do so and Agravaine murdered him both for his incompetency and to assure Eoghan did not tell Arthur of Agravaine's betrayal. Having killed his "inside-man"/"fall-guy", Agravaine had to resort to obtaining the siege tunnel plans himself. Agravaine found the chance to steal them and succeeded. He took the plans to Morgana, who copied the page using magic. Soon after, Morgana met up with Helios and they planned and negotiated their attack on Camelot (The Hunter's Heart).