Celtica (ケルティカ；kelutica) is a family exclusive to Grandwalker Nexus that premiered in BS70, mid-way through the Contract Saga: True.
As the name implies, Grandwalkers in the family come from Irish/Celtic mythology.
In the lore, it is mentioned that apart from the four major factions, Olym/Hindida/Amahara/Egyt, there is a small faction in the far north of the Divine World that is called the "Celtica Union (ケルティカ連合)". While they rule the far north, the faction power is low, and insignificant when compared with the four major factions in the center. Brigit's performance in the war against the Primordial Deities, however, revealed that the power of Grandwalkers from the Celtica Union isn't as low as it let on, and surprised even the lord of information and communication, Hermes.
In the story of Contract Saga: True, Toa, who was sent to the far north of the Divine World accidentally due to the unstable teleportation device owned by Versroy, was saved by Brigit. As a result, Toa became the Contractor of the Celtica Union, as opposed to Dan with Olym, and Kai with Vulrica.
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