The Ravens' Ark was an organization that acted as the hub for all Raven activity. Before its destruction, the Ark used to employ and manage almost all Ravens. By the time of Armored Core: Nexus, administration of the Ark had been transferred to Jack-O. The Ark's sole contingency on membership was that it would act as arbitrator for all agreements between the Ravens and the corporations, likely a measure put in place by the fiercely anti-corporate Jack-O to prevent undue interference on the part of the major corporate groups.