Editing Halo Array

{{Status|Canon}}
{{Center|"Halo" redirects here. For other uses, see [[Halo (disambiguation)]].}}
[[File:TerminalArkArray.jpg|thumb|300px|The Array at [[Installation 00]], just before their departure to firing sites across the galaxy.]]
{{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]] during the [[Battle of Installation 04]]}}.{{Ref/Level|Id=TB|CE|CE:Two Betrayals|Two Betrayals}}
The '''Halo Array''', sometimes known simply as '''Halo'''{{Ref/Book|HWF|Page=92}} or '''the Array''',{{Ref/Game|H3|H3:Terminals|Terminal 4}}{{Ref/Game|CEA|CEA:Terminals|Terminal 2}} is a network of colossal ring-shaped superweapons individually known as '''Halos''' or '''Halo rings''', constructed by the [[Forerunner]]s.{{Ref/Level|Id=TC|CE|The Truth and Reconciliation}} The Halos were also referred to by the [[Covenant]] as the '''Sacred Rings''',{{Ref/Novel|Id=TF1|TF|Chapter=1}}{{Ref/Level|Id=gravemind|H2|H2:Gravemind|Gravemind}} and labeled as '''Installations''' or infrequently referred to as Fortress Worlds{{Ref/Novel|TF|Chapter=7}} by the Forerunners and their [[monitor]]s.

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/Novel|Id=c34|Cry|Chapter=34}} Later, the weapons would be refined further and a new array of six smaller and significantly more lethal installations was constructed; the newer Halos are known as the "neoteric" rings.{{Ref/Site|Id=neoteric|URL=https://www.reddit.com/r/halo/comments/70wbxc/return_to_the_denomination_installation_04_b_c/dn76nzc/|Site=Reddit|Page=Return to the denomination. Installation 04 (B), (C). Canonically. 343 PLS|D=18|M=9|Y=2017}} Eventually, eleven were destroyed and/or lost while the remaining [[seven]] were [[Great Purification|used]] by the Forerunners as a last resort when combating the parasitic [[Flood]].{{Ref/YouTube|Id=Lorestream|fYaxRoAf96s|HALO|Halo Lore Stream: The Halo Array|D=6|M=4|Y=2018|343 discuss the Halo Array}} All [[sentience|sentient]] beings in the galaxy were killed, robbing the Flood of hosts and starving it to death.

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/Reuse|Lorestream}}{{Ref/Novel|Id=c37|Cry|Chapter=37}}{{Ref/Novel|Id=c41|Cry|Chapter=41}}

==Background==
[[File:Halo Surface.jpg|thumb|200px|A section of a Halo's surface.]]
{{Quote|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.|[[343 Guilty Spark]] during the [[Battle of Installation 05]]}}{{Ref/Reuse|great journey}}
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/Level|Id=great journey|H2|H2:The Great Journey|The Great Journey}} 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/Level|Id=library|CE|CE:The Library|The Library}}

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/Novel|Id=gas giants|Sil|Detail=String 27}} However, as of [[2557]], [[Installation 03]] orbited a rocky planet.{{Ref/Level|Id=h4composer|H4|H4:Composer|Composer}} 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/Level|Id=The Oracle|H2|H2:The Oracle|The Oracle}}

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/Game|CEA|CEA:Terminals#Terminal 8|Terminal 8|Quote=25,000 light years. That is the effective range of this installation.}}{{Ref/Level|Id=radius|CE|CE:Two Betrayals|Two Betrayals|Quote=Technically, this installation's pulse has a maximum effective radius of 25,000 light years.|Quotee=343 Guilty Spark}} The method utilized by the array to conduct this "mass sterilization protocol"{{Ref/Level|CE|CE:The Library|The Library|Quote=Why the Flood is, naturally, simply too dangerous to release, and mass sterilization protocols may again need to be enacted.|Quotee=343 Guilty Spark}} 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/Novel|Id=Cry12|Cry|Chapter=12}}{{Ref/Novel|Id=Cry28|Cry|Chapter=28}}

[[File:H2A - Halo Array hologram.jpg|left|thumb|250px|Readout of the seven Halos.]] 
The Halo Array in its entirety has been fired only [[Great Purification|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/Reuse|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/Novel|Id=rebirth|Rebirth}} 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 08|replacement]] Halo for the destroyed Installation 04 was activated outside of the galaxy, meant to eliminate the Flood massed at [[Installation 00]]. Upon firing, its incomplete state caused the ring to shake itself to pieces, with the resulting explosion damaging the Ark. However, some Flood forms survived the activation.{{Ref/Site|Id=IntroducingATN|URL=https://www.halowaypoint.com/en-us/news/introducing-halo-wars-2-awakening-the-nightmare|Site=Halo Waypoint|Page=Introducing Halo Wars 2: Awakening the Nightmare|Quote=While most of the Flood threat was destroyed in the crash of High Charity and in the explosive end of Halo 3, even the smallest remaining spore of Flood can take over the galaxy, given enough time.|D=29|M=09|Y=2021|LocalArchive=https://archives.halopedia.org/waypoint/www.halowaypoint.com/en-us/news/introducing-halo-wars-2-awakening-the-nightmare.html}}

Each of the Halo installations manufactured at Installation 00 is given a sequential designation number based on their order of construction, beginning from 01,{{Ref/Reuse|neoteric}} 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.

The Array also encompasses [[Installation 00]], an extra-galactic 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/Level|Id=thecovenant|H3|H3:The Covenant|The Covenant|Quote=The Ark is out of range of all the active installations!|Quotee=343 Guilty Spark}} The Forerunners also built [[shield world]]s as a means to escape the effect without having to leave the galaxy.{{Ref/Novel|GoO|Chapter=??}}
{{clear}}

==History==
===Construction===
[[File:ForerunnerObserver.jpg|thumb|250px|A Forerunner observes the construction of a Halo.]]
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 [[Ancestors|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/Novel|Id=c30|Cry|Chapter=30}} 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/Reuse|c34}} 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/Novel|Id=SoI|SoI}}

However, at this point, the [[Librarian]] went to the Council and invoked the Mantle, stating that 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/Novel|Id=string3|Sil|Detail=String 3}} 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/Novel|Pri|Page=188-190}}

Twelve Halos, each 30,000 kilometers in diameter, were originally commissioned by Master Builder Faber and constructed by [[Wise-Hands-to-Forge]]'s [[guild]] 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/Novel|Cry|Chapter=40|Quote=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/Novel|Id=string29|Sil|Detail=String 29}} 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/Reuse|string3}}

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/Novel|Id=maker|Sil|Detail=String 5}} 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/Reuse|string3}} their location known only to the Master Builder.{{Ref/Reuse|string33}}

The final Array, activated at the conclusion of the Forerunners' conflict with the Flood, comprised seven rings, each 10,000 kilometers in diameter, one of them being the reduced Installation 07.{{Ref/Reuse|string36}}

===Forerunner-Flood war===
[[File:FoM.jpg|thumb|left|250px|The original Halos gathered in orbit around [[Maethrillian]].]]
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. Eventually, Mendicant Bias disappeared with Installation 07 after being [[logic plague|corrupted]] by the Primordial.

Following the use of a second Halo 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 following the ancilla's corruption and [[Fate of Maethrillian|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 a [[slipspace portal]], yet only [[Omega Halo|one]] escaped before the portal collapsed, with the other six breaking up in slipspace.

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 [[Battle for Gyre 11|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/Reuse|string36}}

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/Novel|Sil|Detail=String 27}} 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, 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/Novel|Id=string33|Sil|Detail=String 33}}

====Activation====
{{Main|Great Purification}}
[[File:Array.png|thumb|300px|Installation 00 sending the Halo Array through a [[slipspace portal]] during the [[Forerunner-Flood war]].]]
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 received a new name and numeric designation, each intended to serve as a form of memorial to the Forerunners. 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/Novel|Id=string36|Sil|Detail=String 36}}

[[File:HaloFiring.png|thumb|left|250px|The Halo Array fires, ending the conflict.]]
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/Novel|Id=string38|Sil|Detail=String 38}} 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/Novel|Id=string37|Sil|Detail=String 37}} 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/Reuse|string36}} However, their total destruction seems apparent from the fact they were no longer in evidence when the Forerunners repopulated the galaxy.{{Ref/Reuse|rebirth}}

It was later discovered that a species called the [[Xalanyn]] had somehow survived the firing of the Halo Array. Frightened that the Xalanyn would eventually become the dominant species of the galaxy and claim the [[Mantle of Responsibility]], the Forerunners brought [[Installation 07]] into orbit of the Xalanyn homeworld under the pretense of a meeting and imprisoned them on the ring for containment and study.{{Ref/Game|Hi|[[HINF:Audio log|Audio logs]]}}

===Post-activation===
The seven Halos then remained relatively dormant for approximately 100,000 years, though at least [[Installation 05]] experienced a major Flood outbreak, while [[Installation 04]] was visited briefly by other species,{{Ref/Game|H2|Conversations from the Universe}} including a [[unidentified alien vessel|major crash-landing]] in [[40,000 BCE]].{{Ref/Game|CEA|CEA:Terminals|Terminals 5-6}}

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]].

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.

===Rediscovery===
[[File:H2A-AlphaHaloDestruction.jpg|250px|thumb|The destruction of Installation 04.]]
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 vessel|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]].

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 [[United Nations Space Command|UNSC]] forces, the Covenant, [[Sentinel]]s led by [[343 Guilty Spark]], and the Flood.

[[File:Halo Firing.png|250px|left|thumb|The partially constructed Installation 08 hovering over the Ark.]]
The battle finally culminated when [[SPARTAN-II program|Spartan]] [[John-117]] detonated the [[fusion engine]]s 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/Game|H2|[[Burial Mounds]]}}

After escaping the [[Battle of Tribute]], a UNSC [[freighter]], ''[[Floral Express]]'', discovered [[Installation 03]] on October 8, 2552. By October 25 neutralization protocols had been established.{{Ref/Generic|[[Eleventh Hour reports]]|Detail=''5''}}

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 the infected {{UNSCShip|In Amber Clad}}. 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.

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 [[keyship]] ''[[Anodyne Spirit]]'' in the center of the structure, activating it. However, the structure was soon revealed not to be the Ark, but [[Excession|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.

Soon, 343 Guilty Spark, John-117, and [[Arbiter]] [[Thel 'Vadam]] discovered that the Ark had been constructing a [[Installation 08|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/Book|H4EVG|Page=14}} severely damaging the Ark in the process.{{Ref/Novel|Id=hitd c2|HitD|Chapter=2}}
{{Clear}}

===Post-Covenant War===
[[File:HSS-Infinity