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A rank below [[Fleetmaster]]{{Fn|26}} which commands the self-sufficient [[Battlegroup]]s that are formed from the [[Indomitus Crusade]] Battlefleets. Such is their power, that Groupmasters are only answerable to their Battlefleet's [[Fleetmaster]] and [[Lord Commander]] [[Roboute Guilliman]], who has assigned each Indomitus Crusade battlefleet with a grand strategic mission.{{Fn|32}}  Each was to be entirely self-sufficient, with its own agenda and campaigns, its groupmaster reporting only to their fleetmaster and Guilliman.