12,000 years before the Celestial Genesis Era and the Holy Genesis Era, Apollonius created the legendary Mechanical Angel Aquarion, or just "Aquarion", in order to fight the Shadow Angels after he betrayed them when he fell in love with the human princess, Celiane. In order to merge into any form of Aquarion, the Elements must combine their mind, body, and soul into one unanimous form. Their stability heavily rely on the pilot's state of mind and body, and if the pilot is unwell, Aquarion's merge will dissolve back into the three vectors.