This Gran Pulse structure lies deep below the capital city of Eden, its existence unknown to the members of the Sanctum. According to legend, Arks are Gran Pulse armories that hold living weapons in stasis, in preparation for war with outside forces. These facilities also supposedly serve the function of awakening a l'Cie's latent powers. Why this 'Fifth Ark' is on Cocoon, and whether there are other Arks hidden elsewhere, is uncertain.
