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'''Shield worlds''', also known simply as '''Shields''',<ref name="mythos">'''[[Halo Mythos]]''', ''page 18''</ref> are [[Forerunner]] installations designed as a defensive strategy against the [[Flood]] and an alternative to the [[Halo Array]]. As opposed to sterilizing the whole galaxy at once, shield worlds would act as a more precise and conventional solution, serving as both refuges for local populations and powerful military fortresses from which to carry out strategic campaigns against the Flood. Several varieties of shield worlds were designed over nearly nine thousand years; in some iterations the interior was suspended in [[Slipspace bubble|fractal slipspace]], protecting organisms within from the Halos' destructive pulse.<ref>'''Halo: Ghosts of Onyx''', ''page 364-365''</ref> A prevalent variation of the shield world concept, known as the '''conservation sphere''', was specifically designed in tandem with the [[Conservation Measure]], sheltering various evacuated species from the Halo effect.<ref name="EVG">'''[[Halo: The Essential Visual Guide]]''', ''page 174''</ref>
'''Shield worlds''', also known simply as '''Shields''',<ref name="mythos">'''[[Halo Mythos]]''', ''page 18''</ref> are [[Forerunner]] installations designed as a defensive strategy against the [[Flood]] and an alternative to the [[Halo Array]]. As opposed to sterilizing the whole galaxy at once, shield worlds would act as a more precise and conventional solution, serving as both refuges for local populations and powerful military fortresses from which to carry out strategic campaigns against the Flood. Several varieties of shield worlds were designed over nearly nine thousand years; in some iterations the interior was suspended in [[Slipspace bubble|fractal slipspace]], protecting organisms within from the Halos' destructive pulse.<ref>'''Halo: Ghosts of Onyx''', ''page 364-365''</ref> A prevalent variation of the shield world concept, known as the '''conservation sphere''', was specifically designed in tandem with the [[Conservation Measure]], sheltering various evacuated species from the Halo effect.<ref name="EVG">'''[[Halo: The Essential Visual Guide]]''', ''page 174''</ref>


Scattered across the Forerunner [[ecumene]], the shield worlds outnumber the Halos by a large margin,<ref name="EVG"/><ref>'''Halo: Cryptum''', ''page 273''</ref> with over a thousand installations originally planned and at least 673 constructed, assuming their numeric designations were assigned sequentially.<ref name="Have S'moa">[https://www.halowaypoint.com/en-us/community/blog-posts/canon-fodder-have-s-moa '''Halo Waypoint''': ''Canon Fodder: 2-20-15'']</ref><ref name="hbc76">'''Halo: Broken Circle''', ''page 76''</ref> In the final iteration of the Forerunners' defense plan, the shield worlds were collectively known as "Shields"<ref name="mythos"/> while the Halos were known as "the Sword".<ref>'''Halo: Ghosts of Onyx''', ''page 310''</ref>
Scattered across the Forerunner [[ecumene]], the shield worlds outnumber the Halos by a large margin,{{Ref/Reuse|EVG}}<ref>'''Halo: Cryptum''', ''page 273''</ref> with over a thousand installations originally planned and at least 673 constructed, assuming their numeric designations were assigned sequentially.<ref name="Have S'moa">[https://www.halowaypoint.com/en-us/community/blog-posts/canon-fodder-have-s-moa '''Halo Waypoint''': ''Canon Fodder: 2-20-15'']</ref><ref name="hbc76">'''Halo: Broken Circle''', ''page 76''</ref> In the final iteration of the Forerunners' defense plan, the shield worlds were collectively known as "Shields"{{Ref/Reuse|mythos}} while the Halos were known as "the Sword".<ref>'''Halo: Ghosts of Onyx''', ''page 310''</ref>


==History==
==History==
Shield worlds were used by the [[Warrior-Servant]]s as military outposts for thousands of years before the [[Forerunner-Flood war]].<ref name="h4guide">[http://www.halowaypoint.com/en-US/halo4guide '''Halo 4 Interactive Guide''']</ref><ref name="h4terminals">'''Halo 4''', ''[[Terminal (Halo 4)|Terminals]]''</ref> The first shield world, the [[Promethean]]s' military operations hub known as [[Requiem]], was constructed long before the [[human-Forerunner wars]] in [[107,445 BCE]].<ref name="sil278">'''Halo: Silentium''', ''page 278''</ref>
Shield worlds were used by the [[Warrior-Servant]]s as military outposts for thousands of years before the [[Forerunner-Flood war]].<ref name="h4guide">[http://www.halowaypoint.com/en-US/halo4guide '''Halo 4 Interactive Guide''']</ref><ref name="h4terminals">'''Halo 4''', ''[[Terminal (Halo 4)|Terminals]]''</ref> The first shield world, the [[Promethean]]s' military operations hub known as [[Requiem]], was constructed long before the [[human-Forerunner wars]] in [[107,445 BCE]].<ref name="sil278">'''Halo: Silentium''', ''page 278''</ref>


After the Forerunners learned of the parasite known as the [[Flood]] in the later stages of the war with the humans, the [[Ur-Didact|Didact]] began to champion the construction of more shield worlds as part of his [[star-hopping]] strategy. Many shield worlds were planned to be mobile, able to be deployed directly into infected systems to purge local infestations,<ref name="mythos"/> and would be designed as facilities from which to fight and research the Flood, an alternate solution to [[Master Builder]] [[Faber]]'s plan to construct the Halos.<ref name="sil47">'''Halo: Silentium''', ''page 47''</ref> Eventually, a compromise between the two rates was reached: the [[Builder]]s would continue building shield worlds while designing the Halos, with both types of installations planned to be used in tandem.<ref name="mythos"/> Numerous shield worlds of different configurations were built over thousands of years, but the Builder rate's growing influence eventually led the [[Ecumene Council|Old Council]] to deem the Master Builder's Halo project superior. The Didact, who stubbornly continued to advocate his strategy to the Council, was ultimately ordered to cease his project and was forced into [[Cryptum|exile]].<ref name="sil47"/>
After the Forerunners learned of the parasite known as the [[Flood]] in the later stages of the war with the humans, the [[Ur-Didact|Didact]] began to champion the construction of more shield worlds as part of his [[star-hopping]] strategy. Many shield worlds were planned to be mobile, able to be deployed directly into infected systems to purge local infestations,{{Ref/Reuse|mythos}} and would be designed as facilities from which to fight and research the Flood, an alternate solution to [[Master Builder]] [[Faber]]'s plan to construct the Halos.<ref name="sil47">'''Halo: Silentium''', ''page 47''</ref> Eventually, a compromise between the two rates was reached: the [[Builder]]s would continue building shield worlds while designing the Halos, with both types of installations planned to be used in tandem.{{Ref/Reuse|mythos}} Numerous shield worlds of different configurations were built over thousands of years, but the Builder rate's growing influence eventually led the [[Ecumene Council|Old Council]] to deem the Master Builder's Halo project superior. The Didact, who stubbornly continued to advocate his strategy to the Council, was ultimately ordered to cease his project and was forced into [[Cryptum|exile]].{{Ref/Reuse|sil47}}


Though the construction of the shield worlds was abandoned after the Didact's exile, they still found use as shelters for the various species the [[Lifeworker]]s indexed and collected in the [[Conservation Measure]]. Many Forerunners also intended to evacuate to the shield worlds, but the betrayal by the Forerunners' supreme defense AI [[Mendicant Bias]] and its defection to the Flood forced the Forerunners to abandon these plans: Mendicant Bias revealed the locations of the shield worlds to the Flood.<ref>'''[[Halo Encyclopedia]]''', ''page 232''</ref>
Though the construction of the shield worlds was abandoned after the Didact's exile, they still found use as shelters for the various species the [[Lifeworker]]s indexed and collected in the [[Conservation Measure]]. Many Forerunners also intended to evacuate to the shield worlds, but the betrayal by the Forerunners' supreme defense AI [[Mendicant Bias]] and its defection to the Flood forced the Forerunners to abandon these plans: Mendicant Bias revealed the locations of the shield worlds to the Flood.<ref>'''[[Halo Encyclopedia]]''', ''page 232''</ref>
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The [[Covenant]] owe much of their rapid technological advancement to the discovery of a small number of shield worlds early in their history. They stripped these installations of usable technologies,<ref name="Timeline">'''Halo Wars''', ''Timeline''</ref> though whether they continued to inhabit them is unclear.
The [[Covenant]] owe much of their rapid technological advancement to the discovery of a small number of shield worlds early in their history. They stripped these installations of usable technologies,<ref name="Timeline">'''Halo Wars''', ''Timeline''</ref> though whether they continued to inhabit them is unclear.


During the [[Human-Covenant War]], the shield worlds began to be discovered by humanity, starting with the [[Etran Harborage]] in [[2531]].<ref name="Wars" /> The shield world [[Onyx]]'s internal Dyson shell, [[Sarcophagus]], was rediscovered in [[2552]]<ref>'''[[Halo: Ghosts of Onyx]]'''</ref> and [[Requiem]] in [[2557]].<ref>'''[[Halo 4]]'''</ref> Both the Etran Harborage and Requiem were ultimately destroyed, but Sarcophagus became home to a joint UNSC-Sangheili research effort and colony.
During the [[Human-Covenant War]], the shield worlds began to be discovered by humanity, starting with the [[Etran Harborage]] in [[2531]].{{Ref/Reuse|Wars}} The shield world [[Onyx]]'s internal Dyson shell, [[Sarcophagus]], was rediscovered in [[2552]]<ref>'''[[Halo: Ghosts of Onyx]]'''</ref> and [[Requiem]] in [[2557]].<ref>'''[[Halo 4]]'''</ref> Both the Etran Harborage and Requiem were ultimately destroyed, but Sarcophagus became home to a joint UNSC-Sangheili research effort and colony.


==Known types==
==Known types==
===Initial design===
===Initial design===
[[Requiem]] was the first shield world to be constructed, its design later serving as the template for the entire concept.<ref name="sil278"/> This variant features an entirely artificial, heavily armored outer surface and contains a number of concentric miniature Dyson shells within its outer shell. Like the exterior, the interior surface of the outer shell is mechanized, and features a light source for warmth and illumination. Another sphere, containing a terrestrial surface oriented similarly to a planet, is located below the outer shell. The interior of this shell contains the hollow core of the shield world and a Dyson shell-like inverted surface.
[[Requiem]] was the first shield world to be constructed, its design later serving as the template for the entire concept.{{Ref/Reuse|sil278}} This variant features an entirely artificial, heavily armored outer surface and contains a number of concentric miniature Dyson shells within its outer shell. Like the exterior, the interior surface of the outer shell is mechanized, and features a light source for warmth and illumination. Another sphere, containing a terrestrial surface oriented similarly to a planet, is located below the outer shell. The interior of this shell contains the hollow core of the shield world and a Dyson shell-like inverted surface.


Requiem apparently lacked shielding from the Halo effect<ref name="Bulletin924">[https://www.halowaypoint.com/en-us/community/bulletins/the-halo-bulletin-knowledge-drop '''Halo Waypoint''' - The Halo Bulletin: 9.24.14'']</ref> in spite of being the most fortified shield world in existence.<ref name="h4guide"/> Whether this is true of [[the Refuge]], which used a scaled-down version of Requiem's planet-within-shell design, is unclear.
Requiem apparently lacked shielding from the Halo effect<ref name="Bulletin924">[https://www.halowaypoint.com/en-us/community/bulletins/the-halo-bulletin-knowledge-drop '''Halo Waypoint''' - The Halo Bulletin: 9.24.14'']</ref> in spite of being the most fortified shield world in existence.{{Ref/Reuse|h4guide}} Whether this is true of [[the Refuge]], which used a scaled-down version of Requiem's planet-within-shell design, is unclear.


===Conservation sphere===
===Conservation sphere===
[[File:Shieldogram.png|thumb|250px|A holographic diagram of the [[Etran Harborage]].]]
[[File:Shieldogram.png|thumb|250px|A holographic diagram of the [[Etran Harborage]].]]
A common iteration of the shield world concept, the conservation sphere consists of an artificial planetary surface encapsulating a miniature Dyson sphere.<ref name="EVG"/><ref name="Timeline"/> Beneath the artificial planetary surface span kilometers of machinery, including many access portals which lead to the sphere's interior; these portals remain sealed when not in use. The interior of the installation is hollow and features a vast [[Terraforming|terraformed]] surface and a miniature [[Astroengineering|artificial star]]. At least one such installation, the [[Etran Harborage]], had an interior diameter of 2,873 kilometers (1,787 miles).<ref name="EVG"/><ref name="Escape">'''Halo Wars''', campaign level ''[[Escape (Halo Wars level)|Escape]]''</ref><ref>[http://halo.xbox.com/en-us/intel/theuniverse/locations/gallery/shield-world/073e5c8b-63bf-4fdc-a46d-6150a0026201 '''Halo Waypoint''': ''Shield World''] (defunct, backup on [https://web.archive.org/web/20111008060749/http://halo.xbox.com/en-us/intel/theuniverse/locations/gallery/shield-world/073e5c8b-63bf-4fdc-a46d-6150a0026201 Archive.org])</ref>
A common iteration of the shield world concept, the conservation sphere consists of an artificial planetary surface encapsulating a miniature Dyson sphere.{{Ref/Reuse|EVG}}{{Ref/Reuse|Timeline}} Beneath the artificial planetary surface span kilometers of machinery, including many access portals which lead to the sphere's interior; these portals remain sealed when not in use. The interior of the installation is hollow and features a vast [[Terraforming|terraformed]] surface and a miniature [[Astroengineering|artificial star]]. At least one such installation, the [[Etran Harborage]], had an interior diameter of 2,873 kilometers (1,787 miles).{{Ref/Reuse|EVG}}<ref name="Escape">'''Halo Wars''', campaign level ''[[Escape (Halo Wars level)|Escape]]''</ref><ref>[http://halo.xbox.com/en-us/intel/theuniverse/locations/gallery/shield-world/073e5c8b-63bf-4fdc-a46d-6150a0026201 '''Halo Waypoint''': ''Shield World''] (defunct, backup on [https://web.archive.org/web/20111008060749/http://halo.xbox.com/en-us/intel/theuniverse/locations/gallery/shield-world/073e5c8b-63bf-4fdc-a46d-6150a0026201 Archive.org])</ref>


While these installations provide safety from the firing of the Halo Array, many possess weapons that can be used to defend the installation's inhabitants; some even harbor fleets of [[Forerunner dreadnought|dreadnoughts]].<ref name="Control">'''Halo: The Essential Visual Guide''', ''page 35''</ref> These defenses can be activated from an installation's [[control room]] or equivalent control center, which sometimes takes the form of an [[Apex Site|airborne platform]]. However, the control center must be activated by a [[human]]: a [[Reclaimer]].<ref name="EVG"/><ref name="Wars">'''[[Halo Wars]]'''</ref>
While these installations provide safety from the firing of the Halo Array, many possess weapons that can be used to defend the installation's inhabitants; some even harbor fleets of [[Forerunner dreadnought|dreadnoughts]].<ref name="Control">'''Halo: The Essential Visual Guide''', ''page 35''</ref> These defenses can be activated from an installation's [[control room]] or equivalent control center, which sometimes takes the form of an [[Apex Site|airborne platform]]. However, the control center must be activated by a [[human]]: a [[Reclaimer]].{{Ref/Reuse|EVG}}<ref name="Wars">'''[[Halo Wars]]'''</ref>


Certain planets are home to conservation sphere waystations, stellar [[cartographer]]s housing directions to nearby conservation spheres. [[Relic (location)|One such facility]] was located on the human colony world of [[Harvest]].<ref>[https://forums.halowaypoint.com/yaf_postsm2972799_Catalog-Discussion.aspx#post2972799 '''Halo Waypoint''': ''Catalog Interaction'' (post 2972799)]</ref>
Certain planets are home to conservation sphere waystations, stellar [[cartographer]]s housing directions to nearby conservation spheres. [[Relic (location)|One such facility]] was located on the human colony world of [[Harvest]].<ref>[https://forums.halowaypoint.com/yaf_postsm2972799_Catalog-Discussion.aspx#post2972799 '''Halo Waypoint''': ''Catalog Interaction'' (post 2972799)]</ref>
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===Shield World 0001===
===Shield World 0001===
{{Main|Requiem}}
{{Main|Requiem}}
Shield World 0001 (commonly known as Requiem) is the oldest shield world as well as the most heavily fortified.<ref name="h4guide"/> It was built long before the [[human-Forerunner wars]] and served as a template for the construction of the other shield worlds.<ref name="sil278"/> Requiem once served as the nexus of operations for the [[Promethean]] class of [[Warrior-Servant]]s but was sealed off shortly before the end of the [[Forerunner-Flood war]].<ref name="h4guide"/> [[John-117]] and [[Cortana]] found themselves on Requiem in [[2557|July 2557]],<ref>'''Game Informer''' (''May 2012''), ''page 41''</ref> where they encountered [[Jul 'Mdama]]'s [[Jul 'Mdama's Covenant|Covenant]], the occupying Prometheans, and eventually the crew of {{UNSCShip|Infinity}}. John accidentally released the [[Ur-Didact|Didact]] from his imprisonment in [[Core of Requiem|Requiem's core]]; after helping ''Infinity'' escape the Spartan attempted to stop the Forerunner from acquiring the device known as the [[Composer]]. The Didact escaped in his ship ''[[Mantle's Approach]]'' but the two successfully pursued him.<ref>'''[[Halo 4]]''', campaign level ''[[Shutdown]]''</ref> Six months later, in [[2558|February 2558]], the UNSC, the Covenant, and the Promethean forces returned to [[Requiem Campaign|fight for control]] of the shield world,<ref>'''Spartan Ops''', [[S1/Departure|S1E1 ''Departure'']]</ref> which ended when  Jul 'Mdama put Requiem on a collision course with [[Epoloch system|its star]], destroying both bodies.<ref>'''[[Spartan Ops]]''' [[S1/Exodus|S1E10 ''Exodus'']]</ref>
Shield World 0001 (commonly known as Requiem) is the oldest shield world as well as the most heavily fortified.{{Ref/Reuse|h4guide}} It was built long before the [[human-Forerunner wars]] and served as a template for the construction of the other shield worlds.{{Ref/Reuse|sil278}} Requiem once served as the nexus of operations for the [[Promethean]] class of [[Warrior-Servant]]s but was sealed off shortly before the end of the [[Forerunner-Flood war]].{{Ref/Reuse|h4guide}} [[John-117]] and [[Cortana]] found themselves on Requiem in [[2557|July 2557]],<ref>'''Game Informer''' (''May 2012''), ''page 41''</ref> where they encountered [[Jul 'Mdama]]'s [[Jul 'Mdama's Covenant|Covenant]], the occupying Prometheans, and eventually the crew of {{UNSCShip|Infinity}}. John accidentally released the [[Ur-Didact|Didact]] from his imprisonment in [[Core of Requiem|Requiem's core]]; after helping ''Infinity'' escape the Spartan attempted to stop the Forerunner from acquiring the device known as the [[Composer]]. The Didact escaped in his ship ''[[Mantle's Approach]]'' but the two successfully pursued him.<ref>'''[[Halo 4]]''', campaign level ''[[Shutdown]]''</ref> Six months later, in [[2558|February 2558]], the UNSC, the Covenant, and the Promethean forces returned to [[Requiem Campaign|fight for control]] of the shield world,<ref>'''Spartan Ops''', [[S1/Departure|S1E1 ''Departure'']]</ref> which ended when  Jul 'Mdama put Requiem on a collision course with [[Epoloch system|its star]], destroying both bodies.<ref>'''[[Spartan Ops]]''' [[S1/Exodus|S1E10 ''Exodus'']]</ref>


===Shield World 006===
===Shield World 006===
{{Main|Sarcophagus}}
{{Main|Sarcophagus}}
Shield World 006<ref>'''[[Halo: The Thursday War]]''', ''page 120''</ref> (designated "ONI Research Facility Trevelyan" by the UNSC)<ref name="glass397">'''Halo: Glasslands''', ''page 397''</ref> is a Dyson sphere formerly housed within a slipspace bubble of compressed dimensionality, having a diameter of only 23 centimeters in normal space.<ref>'''Halo: Glasslands''', ''chapter 10''</ref> The slipspace bubble was located in the center of the artificial planet Onyx before the planet dissolved and the slipspace rift was deactivated.<ref name="glass378">'''Halo: Glasslands''', ''page 378''</ref> The sphere itself is approximately two astronomical units (300 million kilometers) in diameter and weighs approximately 1.37 solar masses. The Dyson sphere's default environmental conditions are suitable for [[Earth]]-based life but the climate settings can be adjusted for other species' requirements. When Onyx was intact, the only means of access to Shield World 006 was a small portal, which was located inside a [[Core room antechamber|massive antechamber]] in the core of the artificial planet.<ref name="goo311"/>
Shield World 006<ref>'''[[Halo: The Thursday War]]''', ''page 120''</ref> (designated "ONI Research Facility Trevelyan" by the UNSC)<ref name="glass397">'''Halo: Glasslands''', ''page 397''</ref> is a Dyson sphere formerly housed within a slipspace bubble of compressed dimensionality, having a diameter of only 23 centimeters in normal space.<ref>'''Halo: Glasslands''', ''chapter 10''</ref> The slipspace bubble was located in the center of the artificial planet Onyx before the planet dissolved and the slipspace rift was deactivated.<ref name="glass378">'''Halo: Glasslands''', ''page 378''</ref> The sphere itself is approximately two astronomical units (300 million kilometers) in diameter and weighs approximately 1.37 solar masses. The Dyson sphere's default environmental conditions are suitable for [[Earth]]-based life but the climate settings can be adjusted for other species' requirements. When Onyx was intact, the only means of access to Shield World 006 was a small portal, which was located inside a [[Core room antechamber|massive antechamber]] in the core of the artificial planet.{{Ref/Reuse|goo311}}


Near the end of the [[Onyx Conflict]] on [[2552#November|November 3, 2552]], Covenant [[Fleet Master]] [[Voro Nar 'Mantakree]] led [[Joyous Exultation Covenant|his forces]] in an attempt to access Shield World 006. However, [[SPARTAN-II program|Spartan]] [[Kurt Ambrose]] detonated a pair of [[FENRIS nuclear warhead]]s within the core room antechamber after his comrades had passed through the portal, denying the Covenant access. The human survivors, including Spartan-II [[Blue Team]], several [[SPARTAN-III Program|Spartan-IIIs]], Dr. [[Catherine Halsey]], and [[Senior Chief Petty Officer]] [[Franklin Mendez]], were then trapped within the shield world. Shortly thereafter, the installation's [[Onyx Sentinel|Sentinels]] destroyed the artificial surface of Onyx.<ref>'''Halo: Ghosts of Onyx''', ''page 378''</ref> After spending several days in the sphere — over three months in normal space-time — the survivors encountered a population of [[Huragok]] which had been left behind to maintain the sphere. They eventually managed to convince the Huragok into transitioning the shield world into normal space.<ref>'''Halo: Glasslands''', ''page 380''</ref> Soon after, the Office of Naval Intelligence made the installation into a research facility in order to acquire the Forerunner technologies housed there.<ref name="glass397"/> With the outbreak of the [[Created conflict]], the residents of the shield world had it returned to slipspace to act as a measure of protection against [[Cortana]] and her [[Created]] servants. However, conflict continues between the joint human-Sangheili forces on the shield world and the [[Servants of the Abiding Truth]] who later retreated to [[Mackintosh]], a planet in the [[Zeta Doradus system]] that had been caught in Sarcophagus' orbit when it had been removed from slipspace. Mackintosh was subsequently pulled into the slipspace bubble with the shield world when the residents ordered its return for their protection against the Created.<ref>'''[[Halo: Legacy of Onyx]]'''</ref>
Near the end of the [[Onyx Conflict]] on [[2552#November|November 3, 2552]], Covenant [[Fleet Master]] [[Voro Nar 'Mantakree]] led [[Joyous Exultation Covenant|his forces]] in an attempt to access Shield World 006. However, [[SPARTAN-II program|Spartan]] [[Kurt Ambrose]] detonated a pair of [[FENRIS nuclear warhead]]s within the core room antechamber after his comrades had passed through the portal, denying the Covenant access. The human survivors, including Spartan-II [[Blue Team]], several [[SPARTAN-III Program|Spartan-IIIs]], Dr. [[Catherine Halsey]], and [[Senior Chief Petty Officer]] [[Franklin Mendez]], were then trapped within the shield world. Shortly thereafter, the installation's [[Onyx Sentinel|Sentinels]] destroyed the artificial surface of Onyx.<ref>'''Halo: Ghosts of Onyx''', ''page 378''</ref> After spending several days in the sphere — over three months in normal space-time — the survivors encountered a population of [[Huragok]] which had been left behind to maintain the sphere. They eventually managed to convince the Huragok into transitioning the shield world into normal space.<ref>'''Halo: Glasslands''', ''page 380''</ref> Soon after, the Office of Naval Intelligence made the installation into a research facility in order to acquire the Forerunner technologies housed there.{{Ref/Reuse|glass397}} With the outbreak of the [[Created conflict]], the residents of the shield world had it returned to slipspace to act as a measure of protection against [[Cortana]] and her [[Created]] servants. However, conflict continues between the joint human-Sangheili forces on the shield world and the [[Servants of the Abiding Truth]] who later retreated to [[Mackintosh]], a planet in the [[Zeta Doradus system]] that had been caught in Sarcophagus' orbit when it had been removed from slipspace. Mackintosh was subsequently pulled into the slipspace bubble with the shield world when the residents ordered its return for their protection against the Created.<ref>'''[[Halo: Legacy of Onyx]]'''</ref>


===Shield World 0459===
===Shield World 0459===
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Shield World 0459 (formally known as the Etran Harborage; original name loosely translated as Trove)<ref>'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #4]]''</ref> was a standard conservation sphere: a hollow construct with a terraformed surface and an artificial star, surrounded by an artificial planetary shell. The interior of this construct could be accessed through one of the numerous access tunnels located around the surface. Like many shield worlds, Shield 0459 harbored a fleet of {{Class|Sojourner|dreadnought}}s for defense of its inhabitants. At some point, much of the planet's surface had been consumed by the Flood, giving it a barren, desert appearance.
Shield World 0459 (formally known as the Etran Harborage; original name loosely translated as Trove)<ref>'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #4]]''</ref> was a standard conservation sphere: a hollow construct with a terraformed surface and an artificial star, surrounded by an artificial planetary shell. The interior of this construct could be accessed through one of the numerous access tunnels located around the surface. Like many shield worlds, Shield 0459 harbored a fleet of {{Class|Sojourner|dreadnought}}s for defense of its inhabitants. At some point, much of the planet's surface had been consumed by the Flood, giving it a barren, desert appearance.


During the [[Battle of the Etran Harborage|campaign on the installation]] in [[2531#February|February 2531]], the crew of the {{UNSCShip|Spirit of Fire}} encountered the Flood on the surface of and later within the shield world. Upon rescuing [[Ellen Anders|Professor Ellen Anders]], whom [[Arbiter]] [[Ripa 'Moramee]] had captured in order to activate the installation's fleet of Forerunner dreadnoughts, the crew realized the danger this fleet could pose to humanity. Thus, they decided to sacrifice ''Spirit of Fire''{{'}}s [[Shaw-Fujikawa Translight Engine|slipspace drive]], causing a supernova within the shield world's artificial star and destroying the vessels. This plan was successful: Shield 0459 was pulverized by the ensuing explosion, the dreadnoughts were destroyed, and all the Covenant forces and Flood forms on the installation were killed.<ref name="Escape"/>
During the [[Battle of the Etran Harborage|campaign on the installation]] in [[2531#February|February 2531]], the crew of the {{UNSCShip|Spirit of Fire}} encountered the Flood on the surface of and later within the shield world. Upon rescuing [[Ellen Anders|Professor Ellen Anders]], whom [[Arbiter]] [[Ripa 'Moramee]] had captured in order to activate the installation's fleet of Forerunner dreadnoughts, the crew realized the danger this fleet could pose to humanity. Thus, they decided to sacrifice ''Spirit of Fire''{{'}}s [[Shaw-Fujikawa Translight Engine|slipspace drive]], causing a supernova within the shield world's artificial star and destroying the vessels. This plan was successful: Shield 0459 was pulverized by the ensuing explosion, the dreadnoughts were destroyed, and all the Covenant forces and Flood forms on the installation were killed.{{Ref/Reuse|Escape}}


In [[2557]], the debris field from the installation was rediscovered by the ''[[Ace of Spades]]'', captained by [[Rion Forge]], daughter of [[Sergeant]] [[John Forge]] who had destroyed it in the first place. The crew was able to recover [[Little Bit]], a fragment of the installation's AI.<ref>'''[[Halo: Smoke and Shadow]]'''</ref> After being captured by ONI, the crew had Little Bit stolen from them along with all of their data and personal possessions. After [[Mission to the Korinth Prior system|a mission]] to the system encountered a Covenant battlegroup led by [[Gek 'Lhar]], the UNSC sent a massive fleet to the system that launched a nuclear bombardment against the debris field. The bombardment blew the remains of the installation to bits and disrupted its orbit around the [[Korinth Prior system]]'s dwarf star. Anything that survived would most likely fall into the star's gravity and be destroyed, completely eradicating the shield world and keeping it out of enemy hands.<ref>'''[[Halo: Renegades]]'''</ref>
In [[2557]], the debris field from the installation was rediscovered by the ''[[Ace of Spades]]'', captained by [[Rion Forge]], daughter of [[Sergeant]] [[John Forge]] who had destroyed it in the first place. The crew was able to recover [[Little Bit]], a fragment of the installation's AI.<ref>'''[[Halo: Smoke and Shadow]]'''</ref> After being captured by ONI, the crew had Little Bit stolen from them along with all of their data and personal possessions. After [[Mission to the Korinth Prior system|a mission]] to the system encountered a Covenant battlegroup led by [[Gek 'Lhar]], the UNSC sent a massive fleet to the system that launched a nuclear bombardment against the debris field. The bombardment blew the remains of the installation to bits and disrupted its orbit around the [[Korinth Prior system]]'s dwarf star. Anything that survived would most likely fall into the star's gravity and be destroyed, completely eradicating the shield world and keeping it out of enemy hands.<ref>'''[[Halo: Renegades]]'''</ref>
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===Shield World 0673===
===Shield World 0673===
{{Main|The Refuge}}
{{Main|The Refuge}}
Shield World 0673 (renamed "the Refuge" by the [[Ussans]]) was another unique type of shield world and possibly the last shield installation to be constructed.<ref name="Have S'moa"/><ref name="hbc76"/> Like Requiem it housed a terrestrial environment protected by a metallic shell. Overseen by the monitor [[Enduring Bias]], the shield world's most extraordinary feature was its ability to break its outer shell apart and disperse the components across the [[asteroid]] belt of the [[Ussan system|system]] in the event the interior was compromised.<ref name="hbc76"/>
Shield World 0673 (renamed "the Refuge" by the [[Ussans]]) was another unique type of shield world and possibly the last shield installation to be constructed.{{Ref/Reuse|Have S'moa}}{{Ref/Reuse|hbc76}} Like Requiem it housed a terrestrial environment protected by a metallic shell. Overseen by the monitor [[Enduring Bias]], the shield world's most extraordinary feature was its ability to break its outer shell apart and disperse the components across the [[asteroid]] belt of the [[Ussan system|system]] in the event the interior was compromised.{{Ref/Reuse|hbc76}}


In the [[Covenant]]'s early years [[Ussa 'Xellus]], the leader of a [[Sangheili]] resistance movement against the Covenant, used the shield world as a refuge for his followers until they could gather enough strength to strike against the Covenant.<ref>'''Halo: Broken Circle''', ''page 46''</ref> The [[Ussans|Ussan faction]] remained in the shield world, which they named the Refuge, for thousands of years until their rediscovery by Covenant fleeing the [[Great Schism]] in [[2553]].<ref>'''Halo: Broken Circle''', ''pages 301-307''</ref>
In the [[Covenant]]'s early years [[Ussa 'Xellus]], the leader of a [[Sangheili]] resistance movement against the Covenant, used the shield world as a refuge for his followers until they could gather enough strength to strike against the Covenant.<ref>'''Halo: Broken Circle''', ''page 46''</ref> The [[Ussans|Ussan faction]] remained in the shield world, which they named the Refuge, for thousands of years until their rediscovery by Covenant fleeing the [[Great Schism]] in [[2553]].<ref>'''Halo: Broken Circle''', ''pages 301-307''</ref>