Aquarius Mystoria (水瓶座のミストリア Akueriasu no Misutoria ) The Aquarius Gold Saint in the 18th century, redecessor of Aquarius Camus. Mystoria is indicated as being one of the purest men of the Sanctuary of Athena.
He met with Cygnus Hyoga at the 11th house of the zodiac, after he fell in that place after crossing the space-time passage of the god of time, Chronos. Hyoga explains to the gold saint that he came from the future to protect Athena, but Mystoria does not believe the story and freezes him. Later comes to the eleventh house of the zodiac Virgo Shijima, who was weakened by the poison of the "Royal Demon Rose" of the Pisces house, who wants to deliver Saori (affected by the Poison of Samael) to Mystoria. Hyoga frees from freezing and is determined to take and protect Saori , but Mystoria refuses to deliver her. Mystoria and Hyoga collide, using, both, the supreme technique of Aquarius, "Aurora Execution". At the end of the clash, Mystoria believes in Hyoga, then delivers a weakened Saori and declares that Hyoga will be the future successor of the Gold Saint of Aquarius. Then Mystoria using Kholodnyi Smerch kills many poisonous snakes that have appeared in his house.
- Aurora Execution(オーロラ・エクスキューション, Ōrora Ekusukyūshon): Arms joined at the head formed as a pitcher from whose beak emanates a powerful jet of energy freezing with the appearance of the aurora, can freeze at the atomic level everything it hits at a temperature close to absolute zero.
- Kholodnyi Smerch (ホーロドニー・スメルチ, Hōrodonī Sumeruchi): Mystoria hits the opponent with a vortex of air freezing.