A fighting federation of gladiators, taking place in a coliseum in the capital citadel of Irishou.
Often a place used to feature new combat inventions and techniques, where a great deal of publicity can be achieved for a small entrance fee. However, all the Colossus League actually is as a venture, is a front, established and secretly operated by the Imperium dei Cuori to earn them new military gadgets and fresh souls of mortals, fit to be used for Locked Hearts' troops.