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| {{Era|Forerunner|Covenant|HCW|Post|FA}}
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| {{Center|"Halo" redirects here. For other uses, see [[Halo (disambiguation)]].}}
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| [[File:TerminalArkArray.jpg|thumb|right|300px|The Array at [[Installation 00]], just before their departure to firing sites across the galaxy.]]
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| {{Quote|Halo doesn't kill Flood, it kills their ''food''! Humans, Covenant, whatever—we're all equally edible! The only way to stop the Flood is to starve them to death. And that's exactly what Halo is designed to do: wipe the galaxy clean of all sentient life!|[[Cortana]]}}
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| The '''Halo Array''', known individually as '''Halos''' or '''Halo rings''',<ref>'''Halo: Combat Evolved''', campaign level ''[[The Truth and Reconciliation]]''</ref> referred to by the [[Covenant]] as the '''Sacred Rings''',<ref>'''Halo: The Flood''', page 38</ref><ref name="gravemind">'''Halo 2''', campaign level ''[[Gravemind (level)|Gravemind]]''</ref> and labeled '''Fortress Worlds'''<ref>'''Halo: The Flood''', ''page 193''</ref> and '''Installations''' by the [[Forerunners]] and [[monitor]]s, is a system of colossal ring-shaped superweapons.
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| The first array of twelve Halos was constructed by order of [[Master Builder]] [[Faber]] circa [[98,445 BCE]] with the intent of being an ultimate weapon, one that would secure the preeminence of the [[Builder]] [[rate]] in Forerunner society.<ref name="c274">'''Halo: Cryptum''', ''page 274''</ref> Later, the weapons would be refined further and a new array of six smaller and significantly more lethal rings was constructed. Eventually, eleven were destroyed and/or lost while the remaining [[seven]] were used by the Forerunners as a last resort when combating the parasitic [[Flood]]. All [[sentience|sentient]] beings in the galaxy were killed, robbing the Flood of hosts and starving it to death.
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| In addition to serving as weapons of last resort, Halo installations are also research facilities dedicated to containing and studying many different kinds of life forms. The life forms that were hand-selected by the [[Librarian]] included marine life, fauna, and land vertebrates. With the Master Builder's permission, the Librarian would research each animal to detect if their bodies reacted to Flood infection. The research on the animals would be more deeply analyzed if they did become infected. The Librarian's studies also helped determine if the rings could be used to repopulate the galaxy as part of the [[Conservation Measure]].<ref name="c313">'''Halo: Cryptum''', ''pages 313, 334''</ref>
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| ==Background==
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| [[File:H2A - Halo Array hologram.jpg|thumb|right|250px|Readout of the seven Halos.]]
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| [[File:H2_halo_surfaceland.jpg|thumb|right|250px|A section of a Halo's surface.]]
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| As it is known in modern times, the Halo Array is a network of seven ring-shaped megastructures created by the Forerunners, designed to exterminate all sentient life within the Milky Way galaxy.<ref name="great journey">'''[[Halo 2]]''', campaign level ''[[The Great Journey]]'', ('''343 Guilty Spark:''' ''"After exhausting every other strategic option, my creators activated the rings. They, and all additional sentient life in three radii of the galactic center, died, as planned."'')</ref> Built following the [[Human-Forerunner War]], these ringworlds were later used as a last resort against the Flood, a parasitic extra-galactic species that threatened to consume every sentient life-form in the galaxy. By activating the rings, the Forerunners wiped out every sentient being in the galaxy, effectively starving the Flood to virtual extinction, though specimens were kept in a number of Forerunner [[Flood containment facility|containment facilities]], including the Halo installations themselves.<ref name="library">'''[[Halo: Combat Evolved]]''', level ''[[The Library]]''</ref>
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| A total of eighteen Halo rings existed during the reign of the Forerunners; an older array of twelve 30,000-kilometer-wide rings produced by the [[greater Ark]] and six 10,000-kilometer rings, constructed at the newer [[Installation 00|lesser Ark]]. Of these, only seven survived to be included in the final Array. The Halos were originally deployed in orbit over large gas giants.<ref name="gas giants">'''Halo: Silentium''', ''page 237''</ref> However, as of [[2557]], [[Installation 03]] orbited a rocky planet.<ref name="h4composer">'''Halo 4''', campaign level ''[[Composer (level)|Composer]]''</ref> Installation 04 maintained an atmospheric [[Threshold gas mine|mining facility]] in its anchor planet [[Threshold]]'s atmosphere until [[Battle of the Threshold gas mine|it was destroyed]] by the [[Covenant]].<ref>'''[[Halo 2]]''', level ''[[The Oracle]]''</ref>
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| Though separated by thousands of light-years, the installations are networked together and capable of remote activation at [[Installation 00|the Ark]], their [[intergalactic space|extragalactic]] construction foundry. Each Halo installation has a maximum effective range of 25,000 light-years in every direction.<ref>'''Halo: Combat Evolved Anniversary''', ''[[Terminal/Halo: Combat Evolved Anniversary#Terminal 8|Terminal 8]]'' (''"25,000 light years. That is the effective range of this installation."'')</ref><ref name="radius">'''[[Halo: Combat Evolved]]''', level ''[[Two Betrayals]]'', 343 Guilty Spark: ''"Technically, this installation's pulse has a maximum effective radius of twenty-five thousand light years."''</ref> The method utilized by the array to conduct this "mass sterilization protocol"<ref>'''[[Halo: Combat Evolved]]''', level ''[[The Library]]'', 343 Guilty Spark: ''"Why the Flood is, naturally, simply too dangerous to release, and mass sterilization protocols may again need to be enacted."''</ref> involves the superluminal conveyance of a burst of cross-phased super-massive neutrinos, tuned to emit a harmonic frequency that destroys the nervous system of any life form within range. Simpler organisms lacking a neural system are unaffected, along with inanimate structures. [[Precursor]] technology, however, is extremely susceptible to damage from the Halo effect due to its quasi-living [[neural physics]] composition.<ref> '''Halo: Cryptum''', ''page 132''</ref><ref name="c274"/>
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| The Halo Array in its entirety has been fired only once in known history, approximately 100,000 years ago, by the [[IsoDidact]] in order to stop the Flood from overwhelming the galaxy. All beings in the Array's effective range, including Forerunners themselves, were wiped out by the Array's pulse,<ref name="great journey"/> with the exception of those who took refuge on the [[shield world]]s. A number of Forerunners survived at the lesser Ark but chose to exile themselves from the galaxy.<ref name="rebirth">'''Halo: Rebirth'''</ref> The array has come close to activation four times since; Installation 04 was almost activated by the [[John-117|Master Chief]], Installation 05 was activated by Commander [[Miranda Keyes]] at the behest of the [[Jiralhanae]] [[Chieftain of the Jiralhanae|Chieftain]] [[Tartarus]], [[Avery Junior Johnson|Sergeant Johnson]] was forced by the [[Prophet of Truth]] to activate the Array from the Ark, and [[Bobby Kodiak]] was forced by [[000 Tragic Solitude]], the Monitor of the Ark, to activate the Halo Array from the Ark as a revenge. None of these attempts were successful; the first was stopped by Cortana, while the other three attempts were halted by UNSC and [[Swords of Sanghelios|Sangheili]] intervention. A [[Installation 04B|replacement]] Halo for the destroyed Installation 04 was successfully activated outside of the galaxy, eliminating the Flood massed at [[Installation 00]], but it was incomplete and thus not networked to the rest of the Array.<ref name="halo3halo">'''[[Halo 3]]''', campaign level ''[[Halo (Halo 3 level)|Halo]]''</ref>
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| Each of the Halo installations in the final Array is given a designation number, from 01 to 07, and is overseen by a single [[monitor]]. The monitors are given control of the Installations' [[Sentinel]] automatons, from [[Sentinel Aggressor|Aggressors]] to [[Constructor]]s and [[Enforcer]]s, and are responsible for containing the Flood test subjects in their [[Flood research facility|research facilities]] and protecting the Halo from intruders.
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| The Array also encompasses [[Installation 00]], an extragalactic construction facility that can create replacement installations in the event that one is destroyed. All Halos can also be remotely activated from the Ark without being subjected to their effects, as the megastructure is out of the Array's range.<ref name="thecovenant">'''Halo 3''', level ''[[The Covenant (level)|The Covenant]]'', '''343 Guilty Spark''': ''"The Ark is out of range of all the active installations!"''</ref> The Forerunners also built [[shield world]]s as a means to escape the effect without having to leave the galaxy.<ref>'''Halo: Ghosts of Onyx''', ''page ??''</ref>
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| {{clear}}
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| ==History==
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| ===Construction===
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| [[File:ForerunnerObserver.jpg|thumb|250px|A Forerunner observes the construction of a Halo.]]
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| The first Halos were constructed by the [[Master Builder]] [[Faber]] and his [[Builder]]s in the millennia after the [[Flood]] was first encountered in the Milky Way, only to eventually retreat, seemingly due to [[prehistoric human civilization|early humanity]]'s efforts. The most extreme faction of Builders, which at the time controlled the [[Ecumene Council]], claimed that more extreme measures should be used to protect the galaxy against a possible Flood resurgence and proposed building the Array for this purpose. The initial iterations of the weapon system that would eventually become Halo did not share the circular shape of the final installations.<ref>'''Halo: Cryptum''', ''page 243''</ref> Although they faced strong opposition from the [[Promethean]]s, led by the [[Ur-Didact|Didact]], for thousands of years, the faction eventually won the approval of the Council and commenced work on the Array.<ref name="c274"/> Several prototypes of the Halos were constructed and powered by their host facilities, with [[Prototype Halo installation|one such installation]] orbiting a rogue planet.<ref name="SoI5">'''[[Halo: Shadow of Intent]]''', ''pages 5-10'' (Google Play edition)</ref>
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| However, at this point, the [[Librarian]] went to the Council and invoked the Mantle, stating the the Halos should be used as biological preserves in the [[Conservation Measure]], a plan to repopulate the galaxy should the Array ever be activated. The Council approved her request, and ordered that the Halo installations be constructed to have a range of natural environments for the Lifeworkers to preserve their biological specimens in. The Builders also agreed, seeing the inclusion of biological preserves as an effective means of competing with the Didact's shield worlds which incorporated similar measures.<ref name="s44">'''Halo: Silentium''', ''page 44''</ref> However, the Master Builder later altered the initial plan, and his researchers began to use these specimens for a series of brutal experiments involving Flood infection.<ref>'''Halo: Primordium''', ''page 188-190''</ref>
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| Twelve Halos, each 30,000 kilometers in diameter, were originally commissioned by Master Builder Faber and constructed by the [[guild]] of [[Bornstellar's father]] at the [[greater Ark]], the first Ark installation to be constructed. Only one of these original rings ultimately survived to be used in the Forerunners' final plan; this ring was designated [[Installation 07]]. Later on, an improved, separate array of six installations was constructed at the [[Installation 00|lesser Ark]],<ref>'''Halo: Cryptum''', ''page 329'' (''"Slowly it dawned on me that I was looking upon another array of installations: six rings, each rising from one of the petals of an enormous flower."'')</ref><ref name="s250">'''Halo: Silentium''', ''pages 250-251''</ref> although the construction of the second Ark and its more powerful Halos was delayed by the Council for some time to prevent the Builders from becoming too powerful.<ref>'''Halo: Silentium''', ''page 45''</ref>
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| In the later stages of the construction of the first Halos, a Builder named [[Maker-of-Moons]] was assigned to improve upon their designs. The first test deployments had proven the original rings to be unstable and too large to be practically deployed, generating enormous [[Slipstream space#Reconciliation|particle reconciliation]] debt when moved. The original Ark also had several flaws, including the inability to construct smaller installations. Although initially reluctant to admit these defects,<ref name="maker">'''Halo: Silentium''', ''page 91''</ref> the Master Builder, informed by Maker's analysis, commissioned a new Ark and a series of new, more efficient rings several millennia after the first Halos were made; the Builders promoted this as a means to save even more species while being able to create more Halos. The new Ark, known as the lesser Ark or [[Installation 00]], and its six new Halos were constructed in secret,<ref name="s44"/> their location known only to the Master Builder.<ref name="s270">'''Halo: Silentium''', ''page 270''</ref>
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| The final Array, activated at the conclusion of the Forerunners' conflict with the Flood, was comprised of seven rings, each 10,000 kilometers in diameter, one of them being the reduced Installation 07.<ref name="s314">'''Halo: Silentium''', ''page 314''</ref>
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| ===Forerunner-Flood war===
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| The first test of a Halo installation was conducted by [[Mendicant Bias]], who fired [[Installation 07]] in [[Charum Hakkor system|the system]] of [[Charum Hakkor]] and [[Faun Hakkor]] on a low power setting, destroying all of the sentient life on the latter planet and inadvertently releasing the [[Primordial]], an extant [[Precursor]] entity, from captivity on the former planet. Mendicant Bias then brought the released being to the Halo for study and began a 43-year-long interrogation of it.
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| Following the use of Installation 07 by Master Builder Faber to suppress [[Battle of Janjur Qom|a rebellion]] on the [[San'Shyuum]] homeworld of [[Janjur Qom]], the other eleven Halo installations were taken to the Forerunner [[Capital]] during the tribunal against Faber, where it was to be decided whether to decommission them. However, in the midst of the trial, Mendicant Bias, turned rampant by the Primordial, appeared with Installation 07, which had gone missing since the San'Shyuum rebellion, and assaulted the Capital. The AI attempted to seize control of the remaining Halos and fire them, but was only able to control five out of the twelve. One of those five was destroyed by the combined tidal forces of the Capital, the firepower of local Forerunner fleets, and the stress of a recent [[slipspace]] transition. The seven Halos that Mendicant Bias was unable to control were recalled to Installation 00 via slipspace jumps, yet only [[Omega Halo|one]] escaped before the portal collapsed, with the other six breaking up in slipspace.
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| Installation 07 jumped into a distant system on a pre-designated destructive collision course with [[Wolf-faced planet|a planet]]—a security measure put in place in the event that it fell out of Forerunner control. The installation was eventually reclaimed by the IsoDidact's forces, and it survived the passage of the planet despite taking heavy damage. A significant amount of the ring's superstructure was discarded, reducing its size to 10,000 kilometers, in order to allow it to perform a successful slipspace jump to the [[greater Ark]]. The installation's surviving biological specimens were transported on the Ark and the Flood outbreak on the ring was contained. The ring was refitted to enable it to function in concert with the six final Halos and deployed to its final station in the galaxy; the distribution of the final Halo Array would follow several years later.<ref name="s314"/>
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| During the battle at the Capital and the years that followed, all but one of the original twelve rings—[[Omega Halo]]—apart from the repurposed Installation 07 were hunted down and destroyed by the Flood.<ref>'''Halo: Silentium''', ''pages 234, 237''</ref> In the final hours of the Forerunner-Flood war, the ecumene's leadership retreated to the greater Ark, also home to Omega Halo. When a [[Battle of the greater Ark|Flood attack]] became imminent, it was decided that the IsoDidact go to the lesser Ark where he would deploy and fire the final Halo Array. Before relinquishing the coordinates to his secret Ark,<ref name="s270"/> the Master Builder met the IsoDidact in the control room of Omega Halo and fired the ring, obliterating a small portion of the [[star road]]s laying siege on the Ark and cleansing the [[Large Magellanic Cloud]] of life.<ref name="s273">'''Halo: Silentium''', ''page 273''</ref>
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| ====Activation====
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| {{Main|Great Purification}}
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| [[File:HaloFiring.png|thumb|right|250px|The Halo Array fires, ending the conflict.]]
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| The Flood and the star roads destroyed both Omega Halo and the greater Ark, but the IsoDidact managed to escape to Installation 00 to fulfill his mission. Arriving at the lesser Ark, the IsoDidact had the rings' Index collection distributed to their respective installations aboard a Lifeworker vessel over the Ark. The installations' primary monitors were also formally given their assignments to their final posts. Each monitor also received a new name and numeric designation, each intended to serve as a form of memorial to the Forerunners.<ref>'''Halo: Silentium''', ''page 313''</ref> With the assistance of [[Offensive Bias]], the IsoDidact deployed the remaining six Halos from [[Installation 00 Citadel|the Ark's Citadel]]. Together with Installation 07, these installations comprised the final Halo Array of seven rings.<ref name="s314"/>
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| As Mendicant Bias and the Flood prepared their [[Battle of the Maginot Sphere|final assault]] on the lesser Ark in order to stop the firing of the Halos, the IsoDidact activated the Array. [[Installation 04]] was first in the Array to fire, with the others following sequentially as their fields intersected.<ref name="sil326">'''Halo: Silentium''', ''pages 326-327''</ref> The pulse covered the entire galaxy, killing all sentient life within range and destroying the Precursors' [[neural physics]] architecture, including the [[Domain]] the Forerunners used to hold dear.<ref>'''Halo: Silentium''', ''pages 322-323''</ref> Whether the pulse would destroy star roads and other Precursor artifacts in faster-than-light transit was uncertain even to the Forerunners themselves, due to the largely unknown mechanisms of Precursor superluminal travel.<ref name="s312">'''Halo: Silentium''', ''page 312''</ref> However, their total destruction seems apparent from the fact they were no longer in evidence when the Forerunners repopulated the galaxy.<ref name="rebirth"/>
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| ===Post-activation===
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| The seven Halos then remained relatively dormant for approximately one hundred thousand years, though at least [[Installation 05|one]] of them experienced a major Flood outbreak, and at least [[Installation 04|one]] have experienced brief visits by other species,<ref>''"[[Conversations from the Universe]]"''</ref> including a [[unidentified alien vessel|major crash-landing]] in [[40,000 BCE]].<ref>'''Halo: Combat Evolved Anniversary''', ''[[Terminal/Halo: Combat Evolved Anniversary|Terminals 5-6]]''</ref>
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| The Array's activation caused catastrophic damage to ecosystems across the galaxy, with innumerable species both sentient and non-sentient rendered extinct. The dissolving of dead bodies thanks to [[solute]] eventually showed up on the fossil record, and was labeled by scientists as the [[Ross-Ziegler Blip]]. This curious gap was dismissed as an anomaly caused by spatial distortion until [[human]]ity discovered the Array in [[2552]]. Several species indexed by the [[Library Project]] did not survive [[reintroduction]] to their homeworlds, and those that did were all reverted to a [[Technological Achievement Tiers#Tier 7: Pre-Industrial|Tier 7]] technological state. The mostly uneventful period starting after the firing of the Halos was known as the [[dark time]].
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| The [[Covenant]], a theocratic multispecies alliance, was founded on the misguided belief that the Halo Array was actually the source of a "Divine Wind" that allowed the Forerunners to transcend the physical. By activating the Array, they too could embark on this "[[Covenant religion|Great Journey]]" and join the Forerunners in godhood.
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| ===Rediscovery===
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| [[File:H2A-AlphaHaloDestruction.jpg|250px|right|thumb|The destruction of Installation 04.]]
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| Eventually, the stellar coordinates of [[Installation 04]] were discovered through the combination of a [[Sigma Octanus IV Artifact|crystal artifact]] on [[Sigma Octanus IV]] and a [[Babd Catha Forerunner complex|huge Forerunner artifact]] buried under the surface of [[Reach]]. The coordinates were utilized by the {{UNSCShip|Pillar of Autumn}}'s shipboard [[AI]] [[Cortana]] to escape from the [[Fall of Reach]]. The cruiser arrived over the Installation's orbit and was subsequently shot down by Covenant ships. Most of the ship's combat personnel escaped and made landfall on the artificial construct, triggering the [[Battle of Installation 04]].
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| During their investigations on Installation 04, the Covenant encountered a [[Flood containment facility]] and unknowingly released the dormant Flood; they quickly, but only partially, reestablished containment. Soon, a squad of [[UNSC Marine Corps|Marines]] led by [[Captain (Navy)|Captain]] [[Jacob Keyes]] accidentally broke quarantine again, expecting to find a large Covenant weapons cache. The human-waged guerrilla war quickly turned into a massive four-way battle between [[UNSC]] forces, the Covenant, [[Sentinel]]s led by [[343 Guilty Spark]], and the Flood.
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| [[File:Halo Firing.png|250px|left|thumb|The partially constructed Installation 04B hovering over the Ark.]]
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| The battle finally culminated when [[SPARTAN-II program|Spartan]] [[John-117]] detonated the fusion engines of the ''Pillar of Autumn'' on the surface of the Installation, which compromised the structural integrity of the ring. The gravitational momentum and inertia still perpetuating the ring in orbit around [[Threshold]] then tore the ring apart. The remains of Installation 04 were scattered as debris in space. The explosion sent massive chunks of the ring careening into [[Basis]]; the moon suffered a constant bombardment of debris from the ring after its destruction.<ref>'''Halo 2''', multiplayer level ''[[Burial Mounds]]''</ref>
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| After escaping the [[Battle of Tribute]], a [[UNSC]] [[freighter]], ''[[Floral Express]]'', discovered [[Installation 03]] on October 8th, 2552. By October 25th neutralization protocols had been established.<ref>''[[Eleventh Hour reports]]'' - ''#5''</ref>
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| Later, the Covenant discovered a third Halo, [[Installation 05]]. On this Halo, the Flood had already been released and much of the ring had been compromised, including its monitor, [[2401 Penitent Tangent]]. Soon, [[Battle of Installation 05|another four-way conflict]] began. The battle ended in the Flood manifesting a [[Gravemind]] and successfully escaping the ring aboard infected Covenant ships. The ring was nearly activated by [[Tartarus]], the [[Chieftain of the Jiralhanae|Chieftain]] of the [[Jiralhanae]], but [[Commander]] [[Miranda Keyes]] pulled the [[Activation Index]] out of the installation's core at the last moment, causing all six functional installations to go into "standby mode", ready for remote activation from the Ark.
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| The human survivors returned to [[Earth]] and resumed their fight against the Covenant, who had uncovered a large structure on Earth, which they assumed to be the Ark. The Covenant landed the [[Forerunner Dreadnought]] in the center of the structure, activating it. However, the structure was soon revealed not to be the Ark, but [[the Portal|a generator]] of a portal to the actual [[Installation 00|Ark]], a massive artificial world located outside the galaxy. Human and [[Swords of Sanghelios|Sangheili]] forces proceeded through the portal to the newly-discovered installation to prevent the Covenant from activating the remaining Halo rings remotely. Eventually, the Gravemind arrived at the Ark aboard [[High Charity]], the Covenant's capital city, which had been turned into a Flood hive. The hive crashed onto the installation, releasing the Flood.
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| Soon, 343 Guilty Spark, John-117, and [[Arbiter]] [[Thel 'Vadam]] discovered that the Ark had been constructing a [[Installation 04B|new Installation 04]], to replace the one which had previously been destroyed. This new installation was only days from being completed. The humans decided to activate the new ring to stop the Flood, resulting in the incomplete ring destroying itself,<ref>'''[[Halo: The Essential Visual Guide]]''', ''page 14''</ref> severely damaging the Ark in the process.<ref name="hitd c2">'''Halo: Hunters in the Dark''', Chapter 2</ref>
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| {{Clear}}
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| ===Post-Covenant War===
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| [[File:HSS-Infinity-Halo.png|thumb|250px|{{UNSCShip|Infinity}} approaches a Halo installation.]]
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| By [[2553#January|January 2553]], the UNSC had begun an active search for the remaining Halo installations, with the intent to decommission them.<ref>'''Halo: Glasslands''', ''page 50''</ref> By at least [[2557|July 2557]], UNSC scientists were studying the Array for decommissioning, with facilities at Installations 03 and 05. Installation 00 was scouted by both automated probes and the ONI vessel {{UNSCShip|Rubicon}}, which was lost several days after its arrival. [[Installation 07]] was discovered in early [[2555]], with an ONI research group stationed on the ring immediately afterward. A crisis occurred when it was discovered that Installation 07—as well as the other Halos—were counting down to activation in five weeks from March 8, 2555. The activation countdown had been initiated by [[Bobby Kodiak|a human]] captured by [[000 Tragic Solitude]], the Ark's [[Rampancy|rampant]] [[monitor]]. In response to this threat, which was kept highly classified, a joint UNSC-[[Sangheili]] detachment embarked on a mission to the damaged Installation 00, as the Ark was believed to be the source of the countdown.<ref name="hitd c2"/> Ultimately, the team was able to avert the Halos' activation and the monitor was destroyed.<ref>'''[[Halo: Hunters in the Dark]]'''</ref>
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| Later, the scientists studying Installation 03 located the [[Composer]] on the ring and accidentally activated it, causing them to become digitized. However, the sensor data left over from the incident led to the discovery of the [[shield world]] [[Requiem]]. Later, the [[Ur-Didact|Didact]] traveled to Ivanoff Station near Installation 03 to retrieve the Composer and used the device to harvest the essences of the entire research staff before heading for Earth.<ref>'''Halo 4'''</ref> Meanwhile, [[Jul 'Mdama's Covenant faction]] and their [[Promethean]] allies attempted to take control of Installation 03 by using the [[Conduit]] to open [[slipspace portal]]s across the ring, but the attack was repelled by a [[Spartan]] [[Headhunter]].<ref>'''Halo: Spartan Strike''', ''[[Operation C: Valiant Hammer]]''</ref>
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| A day later, after the Didact's [[New Phoenix Incident|defeat at Earth]], the Forerunner and some of his Promethean forces fell on Installation 03 via a slipspace portal. SPARTAN-II [[Blue Team]] followed, resulting in a [[Skirmish on Installation 03|a skirmish]] fought on both Installation 03 and the [[Composer's Forge]]. The Forge's monitor, [[859 Static Carillon]], transported Installation 03 over the Forge for the Didact, who intended to use the ring to finally destroy humanity.<ref name="HE9">'''Halo: Escalation''', ''[[Halo: Escalation Issue 9|Issue #9]]''</ref> However, the monitor instead allied with the Spartans due to his disagreements with the Didact and helped them defeat the Forerunner. After John-117 disabled the Halo's failsafes, Static Carillon ejected the segment housing the [[Control Room (Installation 03)|control room]], causing it to fall upon the Composer's Forge. The monitor then stabilized the ring and took it to an unknown location for repairs.<ref name="HE10">'''Halo: Escalation''', ''[[Halo: Escalation Issue 10|Issue #10]]''</ref>
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| {{Clear}}
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| ==Features==
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| ===Structure===
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| [[File:HaloLatticework.jpg|thumb|right|250px|The foundational latticework of a Halo installation.]]
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| The Halos encountered in the modern times are 10,000 kilometers in diameter; this size is roughly similar to that of [[Earth]], which is 12,756 km in diameter. While the original twelve Halos had a diameter of 30,000 kilometers,<ref>'''Halo: Cryptum''', ''page 310''</ref> concerns about their structural stability and transport led to the second series of rings being reduced in size.<ref name="maker"/> The surface of each ring is 318 kilometers wide,<ref>'''Halo: The Essential Visual Guide''', ''page 6''</ref> and 22.3 kilometers thick.<ref>'''Halo: The Fall of Reach''', ''page 339'' (2001)</ref><ref>'''Halo: The Flood''', ''page 13'' (2003)</ref> The main structure of the ring is constructed of a superdense foundational material,<ref>'''Halo: The Flood''', ''page 340''</ref> with elaborate scaffolding and cantilever structures laid over it to support the artificial landmasses and the myriad tunnel networks and caverns that riddle the installation's internal structure.<ref name="halo3halo"/> Many of these tunnels are transit conduits meant for use by the ring's Sentinels, though some of them can be traversed by humanoid beings.<ref>'''[[Halo: Combat Evolved]]''', campaign level ''[[Halo (Halo: Combat Evolved level)|Halo]]''</ref>
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| The Halo rings achieve their "gravity" through centripetal force. As the ring spins, centripetal force pushes all spinning bodies away from the center of rotation. The ring is uniform, and because of this, all points are the same distance from the center, therefore centripetal force applies evenly. This force also pushes objects on the surface of the ring away from the center of rotation, or pushes them down on the surface of the ring, translating into gravity. When the {{UNSCShip|Pillar of Autumn}} was detonated, it blasted a large mass from Installation 04; no longer a full loop, the centripetal force applied in much greater strength on the newly formed weak point, causing the ring to rip apart.<ref>'''Halo: Combat Evolved''' campaign level, ''[[The Maw]]''</ref>
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| The Halos are capable of repairing themselves to some degree, replacing damaged plates of foundation material and restoring biological sections.<ref>'''Halo: Primordium''', ''page 77-78''</ref> Some of the 30,000 km-diameter Halos could also be reduced to a smaller size by shedding large portions of the foundation.<ref name="maker"/> In order to prevent the ring from falling apart during this process, it could generate a hard light hub with spokes which hold each of the foundation plates in place.<ref>'''Halo: Primordium''', ''pages 345-346''</ref> However, the self-reduction process was far from perfect and made the original Halos prone to instability and collapse.<ref name="maker"/> The newer Halos are capable of safely ejecting small segments as well, as long as the process is overseen by a capable enough intelligence such as a [[monitor]].<ref name="HE10"/>
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| Each installation in the final array orbits a large, dense planet—most commonly a gas giant—which serves as a gravitational anchor.<ref name="gas giants"/> For example, Installation 04 and Installation 05 orbited [[Threshold]] and [[Substance]], respectively, which are both large gas giants, while Installation 03 is anchored to a large rocky planet.<ref name="h4composer"/>
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| ===Custodial===
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| [[File:343.JPG|right|thumb|250px|343 Guilty Spark, monitor of Installation 04.]]
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| The installations are designed to be run by advanced artificial intelligence constructs specially assigned by the Forerunners. The highest intelligence on each installation is a single monitor.<ref>'''Halo: Combat Evolved''', level ''[[343 Guilty Spark (level)|343 Guilty Spark]]''</ref> The monitor's task is to ensure that the installation's [[Sentinel]]s, which range from [[Constructor]]s to [[Sentinel Aggressor|Aggressors]] and [[Enforcer]]s, repair, maintain, and defend the ring from damage, contain Flood specimens, and ensure that their own installation is ready to fire on demand, including running activation simulations.<ref name="gravemind"/> Monitors also have access to their respective installation's defensive system.<ref>'''Halo: Combat Evolved Anniversary''', ''Terminal 1''</ref>
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| The Sentinels encompass a broad category of less intelligent constructs which serve virtually any purpose necessary to ensure that the Halo functions properly and are capable of combating small Flood outbreaks. Should a major Flood outbreak occur, heavier automatons, such as the Enforcers and [[Sentinel Major]]s will be created. In the meantime, Constructors are also created to ensure that the Forerunner structures on the Installation are kept in optimal shape, and that they are not damaged by conflict or weather.<ref name="Icon">'''Halo 2''', level ''[[Sacred Icon]]''</ref>
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| Save for the monitor, all automatons can be constructed at specialized [[Sentinel manufacturing facility|production facilities]] that float high in the Halo's atmosphere. They seem to have access to copious amounts of materials for constructing an almost indefinite number of automatons.
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| | |
| ===Environment===
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| Although first and foremost designed as weapons of mass destruction, the Halos are also designed as habitats for transplanted lifeforms, including but not limited to humans. After [[Master Builder]] [[Faber]]'s plans were co-opted by the [[Librarian]], the Halos were given terrestrial surfaces to support catalogued specimens. The Master Builder intended to allow these specimens to be infected by Flood forms contained on the rings, and then subsequently terminated in order to test the Halos' effectiveness.<ref name="c313"/> The Halo installations support a wide range of environments, habitats, ecosystems, and climates. Installation 04 and Installation 05 supported warm, temperate forests<ref>'''Halo 2''', level ''[[Uprising]]''</ref> that were both deciduous and coniferous, swamps, and cold, snow covered tundra environments.<ref>'''Halo: Combat Evolved''', level ''[[Assault on the Control Room]]''</ref><ref>'''Halo 2''', level ''[[Quarantine Zone (level)|Quarantine Zone]]''</ref> Installation 00 had climate ranging all the way from tundra,<ref name="Cov">'''Halo 3''', level ''[[The Covenant (level)|The Covenant]]''</ref> to forest,<ref name="Cov"/> to desert.<ref>'''Halo 3''', level ''[[The Ark (level)|The Ark]]''</ref>
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| While the terrain of a Halo ring may appear to be naturally formed at first glance, it is actually artificially constructed. [[Strato-Sentinel]]s extract raw materials from the source, process them in transit, and deposit building materials at the Installation.<ref>'''[[The Art of Halo 3]]''', page 30</ref> Four huge terraforming factories then move across the face of the installation to "skin" it with landmasses and bodies of water. These factories also hold in the ring's nitrogen-oxygen atmosphere, which is then leaked out to the surface, eventually pouring through the superstructure, and tugged in place by centripetal force.<ref>'''The Art of Halo 3''', ''page 116''</ref> The installation's buildings are then built by Constructors and Sentinels. An intricate layer of metallic panels is laid down several meters below the surface of the terrain, upon which rock, soil, and eventually vegetation is added. Slopes, hills and mountains can be created by sculpting these panels.<ref name="halo3halo"/> Some features, such as landslides, are the result of time, and have been formed naturally. Others, such as the frigid conditions of the [[Quarantine Zone]] or the lake near the [[Temple (Installation 05)|Temple]] on [[Installation 05]] were artificially created.<ref>'''Halo 2''', campaign level ''[[Delta Halo]]''</ref> There are also numerous indigenous life-forms that live on the Halos; these were brought on the installations as part of the Lifeworkers' conservation project.
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| ===Facilities===
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| [[File:AnniversaryControlRoom.png|thumb|right|250px|The [[Control Room]] of Installation 04.]]
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| Each Halo has several assets that are uniform to all installations. Each contains a [[Control Room]] located somewhere upon its inner surface, from which a [[Reclaimer]] must manually insert the installation's [[Activation Index]] to activate it. Each also possesses a [[Library]], a large structure protected by [[Containment shield|an energy shield]], where the Index is housed and protected by Sentinels.<ref name="library"/><ref>'''Halo 2''', level ''[[Sacred Icon]]''</ref> The index itself is a semisolid [[holography|holographic]] representation of the data needed to activate the ring, and can only be directly inserted successfully by a Reclaimer.
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| Installations also possess [[Cartographer]] facilities, which contain the complete, real-time record and schematic of the installation,<ref>'''Halo: Primordium''', ''page 295''</ref> including its inner passages and networks, to be used as a navigational reference for traversing the installation. [[Flood containment facility|Flood containment]] and [[Flood research facility|research facilities]] are also standard, used by the installation's monitor to conduct research on and observe the surviving Flood specimens; these are protected by Sentinels to prevent an outbreak.<ref name="Flood240">'''Halo: The Flood''', pages 240-242</ref>
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| ===Technology===
| |
| Installations also contain advanced [[teleportation grid]]s, allowing instantaneous transportation for a Monitor or Reclaimer to any place on the installation. These grids cannot be controlled by the Flood, though the Gravemind was able to use that of Installation 05 by controlling 2401 Penitent Tangent.<ref name="gravemind"/> For Sentinels, the installation is riddled with tunnel and cave networks for access and transportation.<ref name="Flood240"/>
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| The Halo installations are also equipped with drive engines spaced along their rim. In the event of an emergency, a Halo can maneuver itself to avoid damage from a collision or weaponry.<ref>'''Halo: Cryptum,''', ''page 314''</ref> While ideally moved through fixed [[slipspace portal|portals]], the rings are able to perform slipspace jumps under their own power. A failsafe measure implemented in the event of capture by hostile forces will transition the Halo into slipspace and place it on a collision course with a planet or other celestial body, ensuring the weapon's destruction rather than allowing it to fall in the wrong hands.<ref>'''Halo: Primordium''', ''pages 279, 339''</ref> At the moment of [[Installation 04]]'s destruction, at least [[Alpha Shard|one major fragment]] of the ring was moved into slipspace, likely as part of this failsafe.<ref name="wp shard">[https://www.halowaypoint.com/en-us/universe/locations/halo-ring-fragment '''Halo Waypoint''': ''Alpha Shard'']</ref>
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| | |
| Halos also possess [[hard light]] reinforcement to stabilize and protect them against tidal and gravitational forces from other objects.<ref>'''Halo: Cryptum''', ''page 311''</ref> One of the most extraordinary systems possessed by the Halos is their ability to lock entire sections of the ring, or, if necessary, the entirety of it, into [[Slipspace bubble|reflective slipspace stasis]]. This suspends these sections in time and renders them invulnerable to damage from the outside. However, it also consumes an enormous amount of energy.<ref>'''Halo: Primordium''', ''page 331-332''</ref>
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| ===Firing method===
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| The seven installations in the final Halo Array function via form of lethal radiation designed to kill all [[sentience|sentient]] life in the installation's three-dimensional radius of 25,000 light-years; when fired in concert with the rest of the Array, this sterilizing effect covers the entire galaxy.<ref name="ENC">'''[[Halo Encyclopedia]]''', ''pages 170-174''</ref><ref name="terminal8">'''Halo: Combat Evolved Anniversary''', ''[[Terminal/Halo: Combat Evolved Anniversary|Terminal Eight]]''</ref>
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| When activated, the Halo rings release a burst of cross-phased supermassive neutrinos.<ref>'''Halo: Cryptum''', ''page 274''</ref> The burst possesses a harmonic frequency, which can be tuned to destroy the nervous system of any macroscopic organism that possesses one, even one as rudimentary as a notochord, as shown in the aftermath of a low-powered test firing of a Halo performed by [[Mendicant Bias]] in [[Charum Hakkor system|the system]] of Charum Hakkor. Fine tuning the pulse can also allow for selective extermination of lifeforms with varying degrees of neural complexity.<ref>[https://twitter.com/GrimBrotherOne/status/766840297498157056 '''Twitter''': ''Jeff Easterling on Twitter'']</ref> The Halo effect is able to target and eliminate most forms of neural structures, from biological nervous systems to esoteric [[neural physics]] constructs, although the effect does not extend to [[artificial intelligence]]s.<ref>'''Halo: Silentium''', ''page 310''</ref> Simpler life forms that do not possess a neural system, such as microbes, fungi, algae, mosses, and traditional plants are unaffected.<ref name="c131">'''Halo: Cryptum''', ''pages 131-133''</ref> While organisms aboard the twelve older rings were safe from the Halo effect itself due to its directional nature, any sentient being would still experience an uncomfortable sensation in the vicinity of the pulse.<ref>'''Halo: Silentium''', ''pages 272-273''</ref>
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| Like virtually all Forerunner technology, the Halos are powered by [[vacuum energy]]. When the main weapon is fired, vacuum energy is siphoned from local space-time to near-depletion.<ref name="s270"/> The pulse of the main weapon is amplified by a series of [[phase pulse generator]]s and channeled toward the Halo's center. A concentration of energy collects into the hub of the installation, which, when the weapon is fully charged, blasts outward in all directions.<ref name="terminal8"/>
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| The radiation is propelled at superluminal speeds and will eventually propagate at a near-infinite velocity. This was known to generate causal paradoxes when the rings first fired, with two of the Halos reporting pre-echoes of the combined activation ''before'' the rings had been fired.<ref name="sil326"/> Once activated from Installation 00, all installations will cumulatively trigger one another as their radiation fields intersect, amplifying the effects of each individual Halo.<ref name="s312"/> The energy discharge covers the Array's effective range and cleanses it of all affected sentient life.<ref name="terminal8"/> Individual Halos can also be fired independently from the rest of the Array; this is known as a "tactical pulse".<ref name="thecovenant"/>
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| In the event a Halo's activation is canceled, a burst of energy is fired from the control center into the hub, causing the energy collected there to violently implode, then dissipate harmlessly.<ref name="great journey"/>
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| The final Halo Array, comprising the six smaller Halos (and the reduced Installation 07) were designed to fire in all directions, within a spherical radius of 25,000 light-years;<ref name="radius"/> together, the rings were capable of killing all sentient life within three radii of the Milky Way's center.<ref name="radius"/> The original twelve Halos were designed to fire laterally, generating a cone-shaped field with a maximum effective range of hundreds of thousands light-years. When fired from the greater Ark to the [[Path Kethona|Large Magellanic Cloud]], the blast was wide enough to cover the entire 14,000 light-year-wide satellite galaxy.<ref name="s273"/> The rings could also be fired on a lower power setting, cleansing specific planets or systems within a relatively small area of effect.<ref name="c131"/>
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| ===Effects===
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| [[File:Killed by Halo Effect.jpg|thumb|250px|A creature is killed by the activation of the Halo Array and is instantly decayed by the Lifeworker solvent.]]
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| The nervous systems of all beings are targeted by the Halos and destroyed, rendering them useless to the Flood; however, the Halo effect does not disintegrate biomass, leaving the victims' bodies mostly intact.<ref>'''Halo 3''', ''Terminal 6'' (''"I toss around [37,654 tonne] dreadnoughts like they were fighters; dimly aware of the former crews being crushed to liquescence."'')</ref> Left untreated, lifeforms killed by the pulse will decay in great masses, which could lead to ecological devastation spread by a miasma of rotten biomatter. Therefore, [[Lifeworker]]s sprayed target biospheres with a [[solute]] that would cause any animal killed by the Array to instantly decay into its component molecules,<ref>'''Halo: Silentium''', ''String Two''</ref> resulting in flash-desiccation.<ref name="terminal8"/> Due to the Forerunners' use of solute, 21st century paleo-archeological studies gave no indication of the mass extinction caused by the Array's firing. However, in [[2332]] the [[Ross-Ziegler Blip]] revealed a tiny aberration in Earth's fossil records.<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''"From the Office of Dr. William Arthur Iqbal"'', ''page 519''</ref>
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| The only known ways to avoid the effects of the pulse are to seek shelter in a [[shield world]] or to escape outside the range of the Array.<ref name="great journey"/>
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| ===Protocol===
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| {{Main|Containment protocol}}
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| Each Halo ring can be activated individually by a [[Reclaimer]], also placing the other installations in standby mode, or they can all be activated simultaneously from Installation 00. In the event of a major Flood outbreak, an installation's monitor will seek out a Reclaimer if available, whom they will enlist to aid them. It will [[Slipspace translocation|teleport]] them to the installation's Library and will assist the individual in retrieving the Index. The monitor then stores the Index within its data arrays for safe transportation, lest the Reclaimer fall prey to the Flood before they can activate the installation. Once at the control room, the Reclaimer is given back the Index and must insert it into [[the Core]] in order to begin the activation sequence. At any point during the charging sequence, a Reclaimer is able to abort the firing by removing the Index from the Core.<ref name="great journey"/>
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| {{clear}}
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| ==List of installations==
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| ===Final Array===
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| {| class="wikitable" style="width:100%; border:1px solid #999999; background: #FFFFFF;"
| |
| ! style="width:100px;" | Designation
| |
| ! style="width:50px;" | Name
| |
| ! style="width:100px;" | Location
| |
| ! style="width:100px;" | Monitor
| |
| ! style="width:100px;" | Status
| |
| |-
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| |[[Installation 00]]
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| |Lesser Ark
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| |[[Intergalactic space|Extragalactic space]]
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| |[[000 Tragic Solitude]]
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| |Repaired; under joint UNSC-Swords of Sanghelios control
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| |-
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| |[[Installation 01]]
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| |Beta Halo
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| |
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| |[[001]]
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| |Intact
| |
| |-
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| |[[Installation 02]]
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| |Epsilon Halo
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| |
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| |[[007]]
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| |Intact
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| |-
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| |[[Installation 03]]
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| |Gamma Halo
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| |[[Khaphrae system]] {{C|formerly}}
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| |[[049 Abject Testament]]
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| |Major surface damage; control room ejected and destroyed
| |
| |-
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| |[[Installation 04]]
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| |Alpha Halo
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| |[[Threshold]] orbit, [[Soell|Soell system]]
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| |[[343 Guilty Spark]]
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| |Destroyed
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| |-
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| |[[Installation 04B]]
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| |Alpha Halo ''(replacement)''
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| |Over Installation 00
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| |343 Guilty Spark
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| |Destroyed
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| |-
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| |[[Installation 05]]
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| |Delta Halo
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| |[[Substance]] orbit, [[Coelest system]]
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| |[[2401 Penitent Tangent]]
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| |Surface [[Glassing|glassed]]; under UNSC quarantine
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| |-
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| |[[Installation 06]]
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| |Kappa Halo
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| |[[16807]]
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| |Intact
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| |-
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| |[[Installation 07]]
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| |Zeta Halo
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| |[[117649]]
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| |Intact; under joint UNSC-Swords of Sanghelios quarantine
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| |-
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| |}
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| ===Original Array===
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| {| class="wikitable" style="width:100%; border:1px solid #999999; background: #FFFFFF;"
| |
| ! style="width:100px;" | Name
| |
| ! style="width:100px;" | Location
| |
| ! style="width:100px;" | Monitor
| |
| ! style="width:100px;" | Status
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| |-
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| |The [[greater Ark]]
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| |Extragalactic space
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| |[[Offensive Bias]]
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| |Destroyed
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| |-
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| |[[Omega Halo]]
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| |Orbiting the greater Ark
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| |N/A
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| |Destroyed
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| |-
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| |}
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| ===Other===
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| [[Prototype Halo installation]]
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| ==Trivia==
| |
| {{Linkbox|gallery=yes|gallerypage=Images of Halos}}
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| *The Halos are remarkably similar to the eponymous megastructure of [[Wikipedia:Larry Niven|Larry Niven's]] ''[[Wikipedia:Ringworld|Ringworld]]'' series. However, Niven's Ringworld encircles a large star, whereas the Halos merely orbit planets, being much smaller than the former. The Halos are also very similar to the [[Wikipedia:Orbital (The Culture)|Orbitals]] from [[Wikipedia:Iain M. Banks|Iain M. Banks']] ''Culture'' series, though considerably smaller.
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| *In a ''Halo: Combat Evolved'' [[Pre-Xbox Halo|prototype]], Installation 04 had a section that was only partially constructed. This feature was dropped from the final game, though it inspired the design of the second Installation 04.
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| *The Prophet of Mercy once referred to the Halo Array's pulse as a divine wind.<ref name="Icon"/> This is a literal translation of ''[[Wikipedia:Kamikaze|kamikaze]]'', suicide attacks carried out by Japanese pilots against Allied vessels near the end of World War II. ''Kamikaze'' aviators were willing to give their lives based on their fanatical devotion to defend [[Wikipedia:Hirohito|Emperor Hirohito]] and the state. This is mirrored by the Covenant's quest to activate the Halos and commit holy war in deference to their gods.
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| ==Gallery==
| |
| <gallery>
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| File:Delta Halo.jpg|[[Installation 05]].
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| File:1206904788 Halo-Ring.JPG|The surface of a Halo ring.
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| File:Installation_05.jpg|Installation 05 as it aborts its firing sequence.
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| File:POAEngineRoom.jpg|Sentinels fighting the Flood on Installation 04.
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| File:Array.png|Installation 00 sending the Halo Array through a [[slipspace portal]] during the [[Forerunner-Flood war]].
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| File:HaloLegends-Origins-HaloArray.png|A Halo installation, as seen in ''Halo Legends: Origins''.
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| File:Halo-Legends-Origins-1 HaloArrayFiring.jpg|A Halo being fired in ''Halo Legends: Origins''.
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| File:HaloLegends-Origins-HaloPostFiring.png|A Halo ring's pulse dimming after its activation in ''Halo Legends: Origins''.
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| File:FUD-HaloRing.jpg|A visual reference to a Halo ring in ''[[Halo 4: Forward Unto Dawn]]''.
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| File:Halo ring and thing.jpg|A post-war human [[space station|station]] near an unknown Halo installation.
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| </gallery>
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| | |
| ==List of appearances==
| |
| {{Col-begin}}
| |
| {{Col-2}}
| |
| *''[[Halo: The Fall of Reach]]'' {{1st}}
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| *''[[Halo: Combat Evolved]]''
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| *''[[Halo: The Flood]]''
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| *''[[Halo: First Strike]]''
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| *''[[Halo 2]]''
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| *''[[Halo Graphic Novel]]''
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| **''[[The Last Voyage of the Infinite Succor]]''
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| *''[[Halo: Ghosts of Onyx]]''
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| *''[[Halo: Uprising]]'' {{Mo}}
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| *''[[Halo 3]]''
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| **''[[Bestiarum]]'' {{Mo}}
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| *''[[Halo: Contact Harvest]]'' {{Mo}}
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| *''[[Halo: The Cole Protocol]]'' {{Mo}}
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| *''[[Halo Wars]]'' {{Mo}}
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| *''[[Halo Legends]]''
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| **''[[Origins]]''
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| **''[[Homecoming]]''
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| **''[[Odd One Out]]'' {{C|Non-canonical appearance}}
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| *''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''
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| **''[[The Mona Lisa]]''
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| *''[[Halo: Reach]]''
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| {{Col-2}}
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| *''[[Halo: Cryptum]]''
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| *''[[Halo: Glasslands]]'' {{Mo}}
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| *''[[Halo: Combat Evolved Anniversary]]''
| |
| **''[[Terminal/Halo: Combat Evolved Anniversary|Terminals]]''
| |
| *''[[Halo: Primordium]]''
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| *''[[Halo: The Thursday War]]'' {{Mo}}
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| *''[[Halo 4: Forward Unto Dawn]]'' {{C|Visual allusion}}
| |
| *''[[Halo 4]]''
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| **''[[Terminal/Halo 4|Terminals]]''
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| *''[[Halo: Silentium]]''
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| *''[[Halo: Escalation]]''
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| *''[[Halo: Broken Circle]]'' {{C|Holographic representation only}}
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| *''[[Halo: Nightfall]]''
| |
| *''[[Halo 2: Anniversary]]''
| |
| **''[[Terminal/Halo 2: Anniversary|Terminals]]''
| |
| *''[[Halo: New Blood]]'' {{Mo}}
| |
| *''[[Halo: Hunters in the Dark]]''
| |
| *''[[Halo: Last Light]]'' {{Mo}}
| |
| *''[[Halo 5: Guardians A Hero Falls trailer|A Hero Falls]]''
| |
| *''[[Halo 5: Guardians]]''
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| *''[[Halo: Shadow of Intent]]'' {{Mo}}
| |
| *''[[Halo Mythos: A Guide to the Story of Halo]]''
| |
| *''[[Halo: Fractures]]''
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| **''[[Promises to Keep]]'' {{Mo}}
| |
| **''[[Untitled story (Halo: Fractures)|Untitled story]]'' {{Mo}}
| |
| *''[[Halo Wars 2]]''
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| {{Col-end}}
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| | |
| ==Sources==
| |
| {{Reflist|3}}
| |
| | |
| ==See also==
| |
| *[[The Anatomy of Halo]]
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| | |
| {{Forerunner|array}}
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| | |
| [[Category:Halo Array| ]]
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| [[Category:Forerunner weapons]]
| |
