In the Emperor's absence, Sophia orders the Urbanus to stop General Vitellius from attacking Disith in compliance with a ceasefire. The arrival of Duke Mad-thane's fleet forces Disith to withdraw. The following day, a vanship courier arrives with a message from Walker, who invites the Silvana to Horizon Cave for repairs and resupply. Lescius reveals himself as a member of the purged House Dagobert and entrusts Alex with the third Mysterion. Prime Minister Marius, a member of the purged House Bassianus, also sent the final Mysterion to Alex before his death. The Silvana finally arrives at Horizon Cave, currently used as a training base for an assault against the Guild. Although the Guild suspects of a rebellion, Delphine decides not to take immediate action. At the base, Claus meets Mikhail Wednesday, elder brother to the late Ralph Wednesday from whom Claus took over the duty of delivering Alvis. Claus and Lavie are also reunited with fellow vanship pilots from Norkia after Duke Mad-thane, who was inspired by Claus's and Lavie's actions at Minagith, called for all pilots to fly as fighter support.