Capricorn

Caprico is a member of dark guild, Grimoire Heart, and one of the Seven Kin of Purgatory. He used a Lost Magic known as Human Subordination, which allowed him to weaken nearby humans' physical and Magical abilities, as well as to enslave humans to make them fight for him, allowing him to summon them as he wished: in short, a reversed version of Celestial Spirit Magic, which allowed him to keep the upper hand in a battle against four of Fairy Tail's top Mages.