1200 years before the Zero/Ao no kiseki duology, the loss after the Mirage treasure destroyed itself panicked the entire tribe. Since then, the tribe vowed to revive the lost treasure by all means necessary, letting their mission to become an obsessive desire through the tribe's passing. Through many long years of research, the Crois Family devised a plan that would take many millenniums for it to realise. To use the entire land of Crossbell itself as a ritual to resurrect the treasure, in the form of an Homunculus little girl. The very same figure that the D∴G Cult worshipped, leading to its cruel foundation underneath the bowels of The Tower of Stargate and The Fort of Sun.