Hydraphur is a Forge World as well as the administrative and fleet capital of Segmentum Pacificus. Orbiting Hydraphur is a Segmentum Fortress, the base for fleet operations throughout Segmentum Pacificus. The Segmentum Fortress is controlled directly by a Master of the Administratum.
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During the Plague of Unbelief, Hydraphur surrendered to the rebel forces of Cardinal Bucharis, to the lasting shame of its subsequent generations. After Hydraphur's return to the fold of the Imperium, Ecclesiarch Chye Balronas instituted an annual religious festival characterized by fasting and penitent observance.[2a]
Another legacy of the Plague was the Administratum's attempt to curtail the power of the Imperial Navy in the system. Although the Hydraphur system was a center of Fleet operations, the administrative presence of the Ecclesiarchy and the Inquisition were increased, while the landholding Naval families on Hydraphur were gradually relieved of their possessions. However, the success of the partition was mixed: although the primary authorities on Hydraphur itself are the Administratum and the Ecclesiarchy, the Navy responded by tightening it's control of the rest of the system and subsector[2b], to the point where the Ecclesiarchy on Hydraphur found it necessary to use covert couriers to communicate with it's fellows in other systems[2c]. The Navy also formed close ties with the mercantile families on Hydraphur, such that their syndicate ties were regarded as family associations.[2b]
- 1: White Dwarf issues 139 and 140, Interstellar Travel, by Jervis Johnson, Andy Jones, Simon Forrest and Rick Priestley
- 2: Crossfire (Novel) - Enforcer: The Shira Calpurnia Omnibus by Matthew Farrer