A war breaks out between three nations Simulacran, Argentum, and Plumbum over Simulacran's helix motor technology that powers the airships known as Simouns. Two fleets of the Simoun, Chor Caput and Chor Tempest, stumble upon a huge Argentum airship fleet attempting steal a Simoun. Suffering massive losses in the battle, the pair Neviril and Amuria of Chor Tempest attempt an extremely powerful but extremely dangerous maneuver out of desperation named the Emerald Ri Majon; Neviril hesitates after making eye contact with the enemy, and the pair fail resulting in an explosion that takes Amuria with it. The fight leaves the sibyllae or members of Chor Tempest extremely demoralized and Neviril in despair.
