The Unvanquished (祈りの空,Inori no Sora?, Sky of Prayer) is the eleventh and penultimate episode of ALDNOAH.ZERO Second Cour, it first aired in Japan on March 21, 2015.
After rescuing Asseylum, Klancain evacuates her to his ship against Slaine's wishes. Slaine tries to convince Asseylum to return, but she refuses. With most of the Orbital Knights now loyal to Slaine, Edelrittuo tells Asseylum that she can trust Mazuurek, who agrees to shelter them in his landing castle to repay his debt to Inaho. Determined to stop the war, Asseylum makes contact with her grandfather. Unfortunately, the Emperor's physical and mental condition have deteriorated significantly, making him incapable of ruling. Meanwhile, Inaho regains consciousness and escapes the Moon Base with Inko's assistance. The UFE then temporarily withdraws from the battle to regroup, intending to take the Moon Base in one final attack. Slaine is aware of the UFE attack, and in response, not only sends forces to intercept them, but orders every Orbital Knight on Earth to simultaneously attack as well in order to ensure the complete destruction of the UFE. However, Slaine's orders are interrupted when Asseylum broadcasts a message to both the UFE and the Orbital Knights, proclaiming her intentions to foster peace between Earth and Vers with her official ascension of the throne as Empress of Vers. She also announces that she will marry Klancain.
This episode is the first and only to feature the new ending theme to the Second Cour, Harmonious.