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'''Shield World''' is the name for the micro [[Dyson Sphere]] constructed by the [[Forerunners]] around the artificial planet [[Onyx]]. Shield world was a massive sphere in space, the inside of which contained habitable ground and atmosphere, with a star in the middle. Shield world was encased in a [[Slipspace]] bubble so that, though it would likely have been well over a hundred million miles in diameter, it only occupied a few meters length in the "real" dimension.  
{{Status|Canon}}
'''Shield worlds''', also known simply as '''Shields''',{{Ref/Book|Id=mythos|HM|Page=18}} 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/Novel|GoO|Page=364-365}} 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/Book|Id=EVG|EVG|Page=174}}


Shield world was designed as the escape for the Forerunners should [[The Halos]] be activated. Shield world had a complex system for defense, and the only known access point was from the [[Core Room Antechamber]] in the center of the planet.
Scattered across the Forerunner [[ecumene]], the shield worlds outnumber the Halos by a large margin,{{Ref/Reuse|EVG}}{{Ref/Novel|Cry|Page=273}} 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/news/canon-fodder-have-s-moa ''Halo Waypoint'': ''Canon Fodder: 2-20-15'']</ref>{{Ref/Novel|Id=hbc76|BC|Page=76}} 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/Novel|GoO|Page=310}}


In [[2552]], after [[Installation 05]] sent a wave throughout the galaxy to put the remaining Halos on standby mode, Onyx's automated defense system was inadvertenly activated. After a complex series of events, and [[The Battle of Onyx]], [[Dr. Catherine Halsey]], [[Franklin Mendez|SCPO Mendez]], and a number of [[Spartan-II]]s and [[Spartan-III]]s escaped to Shield world, and the Core room antechamber was destroyed. However, they found that for some reason, no Forerunner had escaped to shield world after the Halos were activated the first time. <ref>[[Halo: Ghosts of Onyx]]</ref>
==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/Game|Id=h4terminals|H4|Detail=''[[Terminal (Halo 4)|Terminals]]''}} 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/Novel|Id=sil278|Sil|Page=278}}
 
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/Novel|Id=sil47|Sil|Page=47}} 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/Book|Enc09|Page=232}}
 
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/Game|Id=Timeline|HW|Detail=''Timeline''}} 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 [[Trove]] in [[2531]].{{Ref/Reuse|Wars}} The shield world [[Onyx]]'s internal Dyson shell, [[Sarcophagus]], was rediscovered in [[2552]]{{Ref/Novel|GoO}} and [[Requiem]] in [[2557]].{{Ref/Game|H4}} Both Trove and Requiem were ultimately destroyed, but Sarcophagus became home to a joint UNSC-Sangheili research effort and colony.
 
In [[2558]], the shield world [[Bastion]] was uncovered by [[Rion Forge]] and [[343 Guilty Spark]] in the [[Orion complex]].{{Ref/Novel|Id=PoL38|PoL|38}} This shield world was built as an exact replica of the [[Earth]] surface{{Ref/Novel|Id=PoL39|PoL|39}} and it acted as the [[Librarian]]'s secret research laboratory away from the eyes of the [[Ecumene Council]].{{Ref/Reuse|PoL41}} Amongst the work kept there was the Librarian's secret efforts to cause the rebirth of the [[Precursor]] race.{{Ref/Novel|Id=PoL44|PoL|44}} Due to the dangers from the [[Created]], Spark became caretaker of the shield world and moved it to an undisclosed location.{{Ref/Novel|Id=PoL42|PoL|42}}{{Ref/Novel|Id=PoL43|PoL|43}}{{Ref/Novel|Id=PoLEpilogue|PoL|Chapter=Epilogue}}
 
Following the defeat of the Covenant, the surviving [[San'Shyuum]] and [[San'Shyuum flotilla|their flotilla]] planned to retreat to a shield world known as [[Cloister]] for protection. However, it was left unknown if they ever actually succeeded in reaching it.{{Ref/Reuse|DW}}
 
==Known types==
===Initial design===
[[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 several 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 similar 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/Reuse|h4guide}} Whether this was true of [[the Refuge]], which used a scaled-down version of Requiem's planet-within-shell design, was unclear.
 
===Conservation sphere===
[[File:Shieldogram.png|thumb|250px|A holographic diagram of [[Trove]].]]
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, [[Trove]], had an interior diameter of 2,873 kilometers (1,787 miles).{{Ref/Reuse|EVG}}{{Ref/Level|Id=Escape|HW|[[Escape (Halo Wars level)|Escape]]}}<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/Book|Id=Control|EVG|Page=35}} 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/Game|Id=Wars|HW}}
 
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>
 
Conservation spheres can be modeled after existing planets, becoming an exact duplicate of them.{{Ref/Reuse|PoL39}}
 
While most conservation spheres had a habitable outer planetary shell, [[Bastion]]'s was a dead glacial world with no active core.{{Ref/Reuse|PoL38}}
 
===Micro Dyson sphere===
The main component of this type of shield world is a [[Dyson sphere]] located within a bubble of compressed [[slipstream space]]. The only entrance to the interior is a small portal within the core of an artificial planet built around the core. Access to these shield worlds is possible only upon the imminent activation of the Halo Array.{{Ref/Novel|Id=goo311|GoO|Page=311}}
 
The Dyson sphere within this type of shield world is enormous; [[Sarcophagus]], for example, is two astronomical units (300 million kilometers) in diameter. As with the more common conservation spheres, micro Dyson sphere-type shield worlds feature vast terraformed surfaces and a single artificial star. The inner Dyson sphere resides within a slipspace bubble and is thus accessible only from the [[core room antechamber]] in the heart of the artificial planet formed around the structure. In normal space, the slipspace bubble is radically smaller than the interior, being only a few meters in diameter, hence the moniker "micro Dyson sphere".
 
==Known shield worlds==
===Shield World 0001===
{{Main|Requiem}}
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/Level|H4|[[Shutdown]]}} 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/SpOps|[[Departure]]}} which ended when  Jul 'Mdama put Requiem on a collision course with [[Epoloch system|its star]], destroying both bodies.{{Ref/SpOps|[[Exodus (Spartan Ops)|Exodus]]}}
 
===Shield World 0006===
{{Main|Sarcophagus}}
Shield World 006{{Ref/Novel|TTW|Page=120}} (designated "ONI Research Facility Trevelyan" by the UNSC){{Ref/Novel|Id=glass397|Gla|Page=397}} is a Dyson sphere formerly housed within a slipspace bubble of compressed dimensionality, having a diameter of only 23 centimeters in normal space.{{Ref/Novel|Gla|Chapter=10}} The slipspace bubble was located in the center of the artificial planet Onyx before the planet dissolved and the slipspace rift was deactivated.{{Ref/Novel|Id=glass378|Gla|Page=378}} 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/Novel|GoO|Page=378}} 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/Novel|Gla|Page=380}} Soon after, the Office of Naval Intelligence made the installation into a research facility 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/Novel|LoO}}
 
===Shield World 0111===
{{Main|Genesis}}
Shield World 0111, formally know as Genesis, is a shield world{{Ref/Novel|Id=POL40|PoL|Chapter=40}} utilized for the construction of ‘seed worlds’; mining natural satellites physically placed in orbit around the installation. Genesis used these resources to develop new worlds, populating them with the incredibly vast diversity of flora and fauna teeming on its own surface, so that they could be used for civilizations in need of them. In addition to this, Genesis housed a critical gateway facility connecting it to the Domain, an enigmatic information repository utilized by the Forerunners.{{Ref/Site|URL=https://www.halowaypoint.com/en-us/universe/locations/genesis|Site=Halo Waypoint|Page=Genesis|D=09|M=3|Y=2021}}
 
===Shield World 0459===
{{Main|Etran Harborage}}
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 the 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 Trove|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 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/Novel|SaS}} 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/Novel|Ren}}
 
===Shield World 0673===
{{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/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/Novel|BC|Page=46}} 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/Novel|BC|Page=301-307}}
 
===Shield World 0983===
{{Main|Bastion}}
Shield World 0983 (referred to as "Bastion") was a shield world that acted as the [[Librarian]]'s secret laboratory outside of the purview of the [[Ecumene Council]] containing her most dangerous research and experiments.{{Ref/Reuse|PoL41}} It was built using the template of [[Earth]] with the shield world's inner surface resembling an exact copy of humanity's home world.{{Ref/Reuse|PoL39}} Upon returning from [[Path Kethona]] with specimens that grew from two deceased [[Precursor]]s, the crew of the ''[[Audacity]]'' transformed a small shield world in its construction phase into Bastion to nurture the eventual new species created from the Precursor samples with the intention of one day sending them to a world outside of the Milky Way galaxy where they could grow and rebirth the Precursors as something entirely new with a blank slate.{{Ref/Reuse|PoL44}}
 
In [[2558]], Bastion was rediscovered by [[Rion Forge]] and [[343 Guilty Spark]].{{Ref/Reuse|PoL38}}{{Ref/Reuse|PoL39}} After the personality imprint of [[Keeper-of-Tools]] transmitted himself to Bastion,{{Ref/Reuse|POL40}} he launched the ''[[Eden (spaceship)|Eden]]'' to deliver the samples to their new home to begin the rebirth process.{{Ref/Novel|Id=PoL41|PoL|41}} Using the Librarian's key, Spark became the caretaker of Bastion and launched the shield world into a [[slipspace portal]] to an unknown destination in order to keep it out of the hands of [[Cortana]] and the [[Created]].{{Ref/Reuse|PoL42}}{{Ref/Reuse|PoL43}}{{Ref/Reuse|PoLEpilogue}}
 
===Shield World 10021===
{{Main|Shield World 10021}}
Shield World 10021 served as an archive for the [[Juridical]] [[rate]]. This shield world was located in the [[Orion Arm|Orion Spur]] of the [[Milky Way]].{{Ref/Book|HWF|Page=13}}
 
===Cloister===
{{Main|Cloister}}
A Forerunner shield world that the [[San'Shyuum]] [[San'Shyuum flotilla|flotilla]] intended to retreat to.{{Ref/Novel|Id=DW|DW|Chapter=5}} However, it was unknown if they ever succeeded in reaching it.


==Trivia==
==Trivia==
*Shield World was referred to as "the Shield" of the Forerunner, while the Halos were "the sword." This is cryptically familliar to [[Cortana]]'s line on the [[Halo 3 Announcement Trailer]], "I am your shield, I am your sword."
*[[Cortana]]'s line in the [[Halo 3 Announcement Trailer|''Halo 3'' announcement trailer]], ''"I am your shield. I am your sword,"'' echoes the Forerunners' reference to the shield worlds as "the Shield" and the Halos as "the Sword".
*The destruction of two shield worlds involved a [[supernova]]. [[Trove]] was destroyed when the {{UNSCShip|Spirit of Fire}}'s FTL reactor was used to cause the internal sun to go supernova while the destruction of [[Requiem]] in its sun [[Epoloch system|Epoloch]] caused Epoloch to go supernova.
 
==Gallery==
<gallery>
File:Overlayed.png|The fully mechanized surface of [[Requiem]] in ''[[Halo 3]]''.
File:HW TroveOrbit MattePainting.jpg|[[Trove]]'s artificial planetary surface in ''[[Halo Wars]]''.
File:ShieldWorldOuterSurface.png|''Spirit of Fire'' hovering over a barren landscape on the Etran Harborage.
File:SofInShieldWorld.png|''Spirit of Fire'' inside one of the Etran Harborage's access tunnels.
File:Hw ShieldW buildings.png|Structures in the Etran Harborage's interior.
File:HW25.png|Etran Harborage's artificial star.
File:Onyxbetter.jpg|[[Onyx]], the artificial planet that concealed [[Sarcophagus]], in ''[[Birth of a Spartan]]''.
File:Requiem.png|[[Requiem]] with one of its entrance portals open in ''[[Halo 4]]''.
File:H4 - Requiem portals.jpg|Requiem's entrance portals.
File:HBC FullCoverArt.jpg|[[The Refuge]] disassembling itself in ''[[Halo: Broken Circle]]''.
</gallery>
 
==List of appearances==
*''[[Halo: Ghosts of Onyx]]'' {{1st}}
*''[[Halo 3]]''
**''[[Bestiarum]]'' {{Mo}}
*''[[Halo Wars]]''
*''[[Halo: Cryptum]]'' {{Mo}}
*''[[Halo: Glasslands]]''
*''[[Halo Primordium]]'' {{Mo}}
*''[[The Commissioning]]''
*''[[Halo: The Thursday War]]''
*''[[Scanned]]''
*''[[Halo 4]]''
**''[[Terminal (Halo 4)|Terminals]]''
**''[[Spartan Ops]]''
*''[[Halo: Silentium]]''
*''[[Halo: Escalation]]''
*''[[Halo: Broken Circle]]''
*''[[Halo: Last Light]]'' {{Mo}}
*''[[Halo 5: Guardians]]''
*''[[Halo Mythos]]''
*''[[Halo Fractures]]''
**''[[Lessons Learned]]''
*''[[Halo: Smoke and Shadow]]'' {{C|Fragments only}}
*''[[Halo: Legacy of Onyx]]''
*''[[Halo: Bad Blood]]''
*''[[Halo: Renegades]]'' {{C|Fragments only}}
*''[[Halo: Point of Light]]''
*''[[Halo: Divine Wind]]'' {{Mo}}
*''[[Halo: Trial of Reckoning]]'' {{Mo}}
*''[[Halo: Epitaph]]''
 
==Sources==
{{Ref/Sources|2}}


==References==
{{Forerunner|array}}
<references/>
[[Category:Forerunner installations]]
[[Category: Technology]][[Category:The Forerunner]][[Category: Places]]
[[Category:Shield worlds| ]]

Latest revision as of 14:42, November 25, 2024

Shield worlds, also known simply as Shields,[1] 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 fractal slipspace, protecting organisms within from the Halos' destructive pulse.[2] 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.[3]

Scattered across the Forerunner ecumene, the shield worlds outnumber the Halos by a large margin,[3][4] with over a thousand installations originally planned and at least 673 constructed, assuming their numeric designations were assigned sequentially.[5][6] In the final iteration of the Forerunners' defense plan, the shield worlds were collectively known as "Shields"[1] while the Halos were known as "the Sword".[7]

History[edit]

Shield worlds were used by the Warrior-Servants as military outposts for thousands of years before the Forerunner-Flood war.[8][9] The first shield world, the Prometheans' military operations hub known as Requiem, was constructed long before the human-Forerunner wars in 107,445 BCE.[10]

After the Forerunners learned of the parasite known as the Flood in the later stages of the war with the humans, the 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,[1] 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.[11] Eventually, a compromise between the two rates was reached: the Builders would continue building shield worlds while designing the Halos, with both types of installations planned to be used in tandem.[1] Numerous shield worlds of different configurations were built over thousands of years, but the Builder rate's growing influence eventually led the 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 exile.[11]

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 Lifeworkers 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.[12]

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,[13] 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 Trove in 2531.[14] The shield world Onyx's internal Dyson shell, Sarcophagus, was rediscovered in 2552[15] and Requiem in 2557.[16] Both Trove and Requiem were ultimately destroyed, but Sarcophagus became home to a joint UNSC-Sangheili research effort and colony.

In 2558, the shield world Bastion was uncovered by Rion Forge and 343 Guilty Spark in the Orion complex.[17] This shield world was built as an exact replica of the Earth surface[18] and it acted as the Librarian's secret research laboratory away from the eyes of the Ecumene Council.[19] Amongst the work kept there was the Librarian's secret efforts to cause the rebirth of the Precursor race.[20] Due to the dangers from the Created, Spark became caretaker of the shield world and moved it to an undisclosed location.[21][22][23]

Following the defeat of the Covenant, the surviving San'Shyuum and their flotilla planned to retreat to a shield world known as Cloister for protection. However, it was left unknown if they ever actually succeeded in reaching it.[24]

Known types[edit]

Initial design[edit]

Requiem was the first shield world to be constructed, its design later serving as the template for the entire concept.[10] This variant features an entirely artificial, heavily armored outer surface and contains several 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 similar 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[25] in spite of being the most fortified shield world in existence.[8] Whether this was true of the Refuge, which used a scaled-down version of Requiem's planet-within-shell design, was unclear.

Conservation sphere[edit]

A holographic diagram of Trove.

A common iteration of the shield world concept, the conservation sphere consists of an artificial planetary surface encapsulating a miniature Dyson sphere.[3][13] 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 terraformed surface and a miniature artificial star. At least one such installation, Trove, had an interior diameter of 2,873 kilometers (1,787 miles).[3][26][27]

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 dreadnoughts.[28] These defenses can be activated from an installation's control room or equivalent control center, which sometimes takes the form of an airborne platform. However, the control center must be activated by a human: a Reclaimer.[3][14]

Certain planets are home to conservation sphere waystations, stellar cartographers housing directions to nearby conservation spheres. One such facility was located on the human colony world of Harvest.[29]

Conservation spheres can be modeled after existing planets, becoming an exact duplicate of them.[18]

While most conservation spheres had a habitable outer planetary shell, Bastion's was a dead glacial world with no active core.[17]

Micro Dyson sphere[edit]

The main component of this type of shield world is a Dyson sphere located within a bubble of compressed slipstream space. The only entrance to the interior is a small portal within the core of an artificial planet built around the core. Access to these shield worlds is possible only upon the imminent activation of the Halo Array.[30]

The Dyson sphere within this type of shield world is enormous; Sarcophagus, for example, is two astronomical units (300 million kilometers) in diameter. As with the more common conservation spheres, micro Dyson sphere-type shield worlds feature vast terraformed surfaces and a single artificial star. The inner Dyson sphere resides within a slipspace bubble and is thus accessible only from the core room antechamber in the heart of the artificial planet formed around the structure. In normal space, the slipspace bubble is radically smaller than the interior, being only a few meters in diameter, hence the moniker "micro Dyson sphere".

Known shield worlds[edit]

Shield World 0001[edit]

Main article: Requiem

Shield World 0001 (commonly known as Requiem) is the oldest shield world as well as the most heavily fortified.[8] It was built long before the human-Forerunner wars and served as a template for the construction of the other shield worlds.[10] Requiem once served as the nexus of operations for the Promethean class of Warrior-Servants but was sealed off shortly before the end of the Forerunner-Flood war.[8] John-117 and Cortana found themselves on Requiem in July 2557,[31] where they encountered Jul 'Mdama's Covenant, the occupying Prometheans, and eventually the crew of UNSC Infinity. John accidentally released the Didact from his imprisonment in 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.[32] Six months later, in February 2558, the UNSC, the Covenant, and the Promethean forces returned to fight for control of the shield world,[33] which ended when Jul 'Mdama put Requiem on a collision course with its star, destroying both bodies.[34]

Shield World 0006[edit]

Main article: Sarcophagus

Shield World 006[35] (designated "ONI Research Facility Trevelyan" by the UNSC)[36] is a Dyson sphere formerly housed within a slipspace bubble of compressed dimensionality, having a diameter of only 23 centimeters in normal space.[37] The slipspace bubble was located in the center of the artificial planet Onyx before the planet dissolved and the slipspace rift was deactivated.[38] 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 massive antechamber in the core of the artificial planet.[30]

Near the end of the Onyx Conflict on November 3, 2552, Covenant Fleet Master Voro Nar 'Mantakree led his forces in an attempt to access Shield World 006. However, Spartan Kurt Ambrose detonated a pair of FENRIS nuclear warheads 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-IIIs, Dr. Catherine Halsey, and Senior Chief Petty Officer Franklin Mendez, were then trapped within the shield world. Shortly thereafter, the installation's Sentinels destroyed the artificial surface of Onyx.[39] 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.[40] Soon after, the Office of Naval Intelligence made the installation into a research facility to acquire the Forerunner technologies housed there.[36] 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.[41]

Shield World 0111[edit]

Main article: Genesis

Shield World 0111, formally know as Genesis, is a shield world[42] utilized for the construction of ‘seed worlds’; mining natural satellites physically placed in orbit around the installation. Genesis used these resources to develop new worlds, populating them with the incredibly vast diversity of flora and fauna teeming on its own surface, so that they could be used for civilizations in need of them. In addition to this, Genesis housed a critical gateway facility connecting it to the Domain, an enigmatic information repository utilized by the Forerunners.[43]

Shield World 0459[edit]

Main article: Etran Harborage

Shield World 0459 (formally known as the Etran Harborage; original name loosely translated as Trove)[44] 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 Sojourner-class dreadnoughts for the 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 campaign on the installation in February 2531, the crew of the UNSC Spirit of Fire encountered the Flood on the surface of and later within the shield world. Upon rescuing Professor Ellen Anders, whom Arbiter Ripa 'Moramee had captured 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 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.[26]

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.[45] After being captured by ONI, the crew had Little Bit stolen from them along with all of their data and personal possessions. After 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.[46]

Shield World 0673[edit]

Main article: 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.[5][6] 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 system in the event the interior was compromised.[6]

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.[47] The 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.[48]

Shield World 0983[edit]

Main article: Bastion

Shield World 0983 (referred to as "Bastion") was a shield world that acted as the Librarian's secret laboratory outside of the purview of the Ecumene Council containing her most dangerous research and experiments.[19] It was built using the template of Earth with the shield world's inner surface resembling an exact copy of humanity's home world.[18] Upon returning from Path Kethona with specimens that grew from two deceased Precursors, the crew of the Audacity transformed a small shield world in its construction phase into Bastion to nurture the eventual new species created from the Precursor samples with the intention of one day sending them to a world outside of the Milky Way galaxy where they could grow and rebirth the Precursors as something entirely new with a blank slate.[20]

In 2558, Bastion was rediscovered by Rion Forge and 343 Guilty Spark.[17][18] After the personality imprint of Keeper-of-Tools transmitted himself to Bastion,[42] he launched the Eden to deliver the samples to their new home to begin the rebirth process.[19] Using the Librarian's key, Spark became the caretaker of Bastion and launched the shield world into a slipspace portal to an unknown destination in order to keep it out of the hands of Cortana and the Created.[21][22][23]

Shield World 10021[edit]

Main article: Shield World 10021

Shield World 10021 served as an archive for the Juridical rate. This shield world was located in the Orion Spur of the Milky Way.[49]

Cloister[edit]

Main article: Cloister

A Forerunner shield world that the San'Shyuum flotilla intended to retreat to.[24] However, it was unknown if they ever succeeded in reaching it.

Trivia[edit]

  • Cortana's line in the Halo 3 announcement trailer, "I am your shield. I am your sword," echoes the Forerunners' reference to the shield worlds as "the Shield" and the Halos as "the Sword".
  • The destruction of two shield worlds involved a supernova. Trove was destroyed when the UNSC Spirit of Fire's FTL reactor was used to cause the internal sun to go supernova while the destruction of Requiem in its sun Epoloch caused Epoloch to go supernova.

Gallery[edit]

  • The fully mechanized surface of Requiem in Halo 3.

    The fully mechanized surface of Requiem in Halo 3.

  • Trove's artificial planetary surface in Halo Wars.

    Trove's artificial planetary surface in Halo Wars.

  • Spirit of Fire hovering over a barren landscape on the Etran Harborage.

    Spirit of Fire hovering over a barren landscape on the Etran Harborage.

  • Spirit of Fire inside one of the Etran Harborage's access tunnels.

    Spirit of Fire inside one of the Etran Harborage's access tunnels.

  • Structures in the Etran Harborage's interior.

    Structures in the Etran Harborage's interior.

  • Etran Harborage's artificial star.

    Etran Harborage's artificial star.

  • Onyx, the artificial planet that concealed Sarcophagus, in Birth of a Spartan.

    Onyx, the artificial planet that concealed Sarcophagus, in Birth of a Spartan.

  • Requiem with one of its entrance portals open in Halo 4.

    Requiem with one of its entrance portals open in Halo 4.

  • Requiem's entrance portals.

    Requiem's entrance portals.

  • The Refuge disassembling itself in Halo: Broken Circle.

    The Refuge disassembling itself in Halo: Broken Circle.

List of appearances[edit]

Sources[edit]

  1. ^ a b c d Halo Mythos, page 18
  2. ^ Halo: Ghosts of Onyx, page 364-365
  3. ^ a b c d e Halo: The Essential Visual Guide, page 174
  4. ^ Halo: Cryptum, page 273
  5. ^ a b Halo Waypoint: Canon Fodder: 2-20-15
  6. ^ a b c Halo: Broken Circle, page 76
  7. ^ Halo: Ghosts of Onyx, page 310
  8. ^ a b c d Halo 4 Interactive Guide
  9. ^ Halo 4: Terminals
  10. ^ a b c Halo: Silentium, page 278
  11. ^ a b Halo: Silentium, page 47
  12. ^ Halo Encyclopedia (2009 edition), page 232
  13. ^ a b Halo Wars: Timeline
  14. ^ a b Halo Wars
  15. ^ Halo: Ghosts of Onyx
  16. ^ Halo 4
  17. ^ a b c Halo: Point of Light, chapter 38
  18. ^ a b c d Halo: Point of Light, chapter 39
  19. ^ a b c Halo: Point of Light, chapter 41
  20. ^ a b Halo: Point of Light, chapter 44
  21. ^ a b Halo: Point of Light, chapter 42
  22. ^ a b Halo: Point of Light, chapter 43
  23. ^ a b Halo: Point of Light, Epilogue
  24. ^ a b Halo: Divine Wind, chapter 5
  25. ^ Halo Waypoint - The Halo Bulletin: 9.24.14
  26. ^ a b Halo Wars, campaign level Escape
  27. ^ Halo Waypoint: Shield World (defunct, backup on Archive.org)
  28. ^ Halo: The Essential Visual Guide, page 35
  29. ^ Halo Waypoint: Catalog Interaction (post 2972799)
  30. ^ a b Halo: Ghosts of Onyx, page 311
  31. ^ Game Informer (May 2012), page 41
  32. ^ Halo 4, campaign level Shutdown
  33. ^ Halo 4 - Spartan Ops, episode Departure
  34. ^ Halo 4 - Spartan Ops, episode Exodus
  35. ^ Halo: The Thursday War, page 120
  36. ^ a b Halo: Glasslands, page 397
  37. ^ Halo: Glasslands, chapter 10
  38. ^ Halo: Glasslands, page 378
  39. ^ Halo: Ghosts of Onyx, page 378
  40. ^ Halo: Glasslands, page 380
  41. ^ Halo: Legacy of Onyx
  42. ^ a b Halo: Point of Light, chapter 40
  43. ^ Halo Waypoint, Genesis (Retrieved on Mar 9, 2021) [archive]
  44. ^ Halo Legendary Crate, Data Drop #4
  45. ^ Halo: Smoke and Shadow
  46. ^ Halo: Renegades
  47. ^ Halo: Broken Circle, page 46
  48. ^ Halo: Broken Circle, page 301-307
  49. ^ Halo: Warfleet, page 13

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