Ein, Xecty

ゼクティ・アイン

One of Baelgard's four guardians, she is an artificial life-form created by Hiruda, using an ancient weapon as a base. She is actually Killrain's sister, Celestia, since Hiruda constructed her body as Xecty using Celestia's cells. However, she eventually became infected by darkness, prompting Hiruda to create dark matter to absorb those dark forces and prevent further infection.
During a duel with Kiriya, an earthquake causes both of them to fall into a cavern. Kiriya speaks with Xecty, telling her about the importance of hope and self-belief, which forms a close bond between them. Later, during the fight between Kiriya and Saionji, she steps in between them and is stabbed by Saionji, sacrificing her life to stop the war. She explains to him that she did this to give hope to the world, stating that Kiriya is her hope. Her spirit then joins the wind to protect both of them. She is later revived by one of the pods from the Sea Dragon King Ruins and joins the Luminous Knights. She also becomes the priestess of Astraea's Tower of the Wind. Her soul blade is called Sword of Emperors Excelion (Kentei Ekuserion). She also contains Kiriya's Holy Grail, which is drawn from Kiriya's Ultimate Soul Blade (Kyūkyoku Shinken).
She seems to have some sort of bond with Elwyn.