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|Class=[[Forge World]], [[Segmentum Fortress|Fleet Base]]

Orbiting Hydraphur is a the massive [[Segmentum FortressStar Fort]]''Ascendant'' as well as massive shipyards which ring the world{{Fn|4}}. These artificial rings, the while not as large as those on [[Luna]] or [[Segmentum Naval Base|baseMars]] , serve as the fleet base for fleet operations throughout Segmentum Pacificus{{Fn|1}}. However the world itself is divided into several spheres of influence. The Segmentum Fortress is controlled directly by a [[Master (Administratum)|Master of Imperial Navy]] holds sway in the atmosphere and above, while on the surface the [[Ecclesiarchy]] rules in uneasy conjunction with the Administratum[[Adeptus Mechanicus]].{{Fn|14}}

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.{{Fn|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 centre 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 its control over the rest of the system and [[subsector]]{{Fn|2b}}, to the point where the Ecclesiarchy on Hydraphur found it necessary to use covert couriers to communicate with its fellows in other systems{{Fn|2c}}. The Navy also formed close ties with the mercantile families on Hydraphur, such that their syndicate ties were regarded as family associations.{{Fn|2b}} Due to the strife on Hydraphur during the Age of Apostasy, the world was ultimately divided between the Navy, Ecclesiarchy, and Mechanicum.

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 centre 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 its control over the rest of the system and [[subsector]]{{Fn|2b}}, to the point where the Ecclesiarchy on Hydraphur found it necessary to use covert couriers to communicate with its fellows in other systems{{Fn|2c}}. The Navy also formed close ties with the mercantile families on Hydraphur, such that their syndicate ties were regarded as family associations.{{Fn|2b}} Sometime after the [[Great Rift]]'s creation, Hydraphur was invaded by the [[Black Legion]] and the [[Imperium]] sent its forces to defend the world. However, the Black Legion advanced in great numbers, which forced the defenders to retreat - save for the [[Adeptus Custodes]]. No matter how many times the Black Legion charged the Custodes, they have stood firm and have broken the traitors' advance against their [[Auramite]] wall.{{Fn|3}} By the early days of the [[Indomitus Crusade]] it had been assailed 3 times by the forces of Chaos.{{Fn|4}}