basically, in this universe there are two races, the angels and the demons. The angels think they're perfect to the core, and believe that the demons are impure and belong in "the depths". And so, the demons were very angry, and attacked the angels. But the angels magic was too powerful for them, and the demons were stripped of most of their powers, all but one. The only demon to still have their powers, is Vinz. He does not yet know his potential, but he keeps training, and getting stronger.