The Sky Lion is a Sky-attribute Box Weapon that possesses a white mane covered in Sky Flames. Because it has an extremely complex structure, its production is difficult to perfect and only four prototypes are said to have been completed: Nero (black), Bianco (white), Rosso (red) and Giallo (yellow). No criticism can be made about its abilities as a whole and it is an appropriate Box Weapon for the King of Beasts. Lions symbolize power, royalty and strength, so it has been said that the possessor of this Box Animal must also have these same traits.