Scorpio is one of the twelve Zodiac Stones, and one of the seven inhabited by a Lucavi demon. In the chinese Zodiac is a Boar. The Church of Glabados is originally working with the Lucavi, and thus Cardinal Delacroix, a high-ranking official of the Church,
is given the Scorpio Stone to entice him to find other Zodiac Stones. After the Cardinal's unsuccessful attempt to wrench the Taurus Stone from Mustadio Bunanza, Mustadio and his friends Ramza Beoulve and Agrias Oaks confront Delacroix at Lionel Castle, where he pulls out the Scorpio Stone and transforms into the Lucavi Cúchulainn.
Scorpio is also a Zodiac sign used to determine damage compatibility between characters during battle. Scorpio has optimal compatibility with sometimes a Taurus, good compatibility with Pisces and Cancer, and bad compatibility with Aquarius and Leo.