In Halo 4, you fight on a station that was created to study and secure Installation 03, which is briefly seen in-game. The Halo Array was originally created by the Forerunners to be a last-ditch desperate measure against the Flood. Upon activation, it annihilates all sentient life in the galaxy, which the Flood needed to survive. Thus, the Flood-Forerunner war ended in a stalemate when the array was activated, destroying all life in the galaxy. There were DNA samples saved of every single creature in the galaxy, thanks to the Librarian.
After the array was fired, the index of DNA was released to "re-seed" the galaxy, essentially starting everything over again. These DNA samples were saved on the Ark, which was outside the effective range of the halos. There were also other ways to avoid annihilation; a number of "shield-worlds" were constructed to preserve life, and some of the halos themselves had preservation methods, which explains the continued existence of the Flood within them, which were kept in stasis for study purposes.
I am over the age of AGE. After the battle, Halo 2 introduces players to a new perspective. The Prophets of the Covenant appoint a disgraced Elite commander to the role of Arbiter, a respected position that only goes on religious suicide missions.
The Arbiter becomes a playable character, and he helps the Covenant destroy a heretic leader and capture Guilty Spark. Master Chief and the Arbiter both end up on the ring.
The Prophets replace their Elite honor guards with Brute honor guards, creating a Covenant civil war called the Great Schism. Both Chief and the Arbiter get captured by the Gravemind , a leader of the Flood.
The Gravemind gives each playable hero a mission and then sends them away. Master Chief leaves Cortana behind on High Charity, the Covenant capital city now infested with Flood, and follows the Prophet of Truth on his adventure to find the Ark , the installation that built the original Halo rings and can set off all the Halos simultaneously. Halo 3 starts with Master Chief jumping from the spaceship in Halo 2 and plummeting down to Earth in nothing but his Mjolnir armor.
A group of marines revive him, and the Arbiter shows up to assist. The two form an uneasy alliance in an effort to kill the Prophet of Truth before he can activate the Ark. The Covenant find an artifact on Earth that creates a portal to the Ark, and the Flood reach Earth via a hijacked ship. A fleet of Elites shows up to forge an alliance with humans. Chief and the Arbiter fight their way to the central Citadel and kill the Prophet of Truth with the Gravemind 's help, but not before Truth kills Miranda Keyes.
The Gravemind then turns on Chief and the Arbiter, siccing an army of Flood on them. The Ark is hard at work building a new Installation 04 to replace the one Chief broke in the original Halo. To stop the Flood, Chief and the Arbiter attempt to activate the half-built Halo. But first, Chief needs Cortana. He battles through a crashed, overrun High Charity to get his AI back in one of the worst Halo levels of all time. Master Chief goes into cryosleep until his next adventure.
Cortana wakes Master Chief up four years after Halo 3. A subset of Covenant have found the Forward Unto Dawn, and they stage an attack. Just as the fight between John and the Covenant starts to get good, the world underneath the ships, Requiem , opens up and pulls the Covenant fleet and Chief inside. The ring was nearly activated by Tartarus, a Jiralhanae Chieftain , but Commander Miranda Keyes pulled the Index out of the Core at the last moment, causing all six functional Installations to go into "standby mode," ready for remote activation from the Ark.
The Humans 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 Prophet of Truth landed the Forerunner dreadnought down in the center of the structure, activating it. To everyone's surprise, the structure was not the Ark, but a generator of a portal to the Installation 00, a massive artificial world located outside the galaxy.
Human and Covenant Separatist forces proceeded through the portal to the newly discovered installation to prevent the Covenant Loyalists from activating the remaining Halo rings remotely. It was then that the Flood leader, the Gravemind , appeared, having turned the Covenant planetoid city High Charity into a Flood hive.
The hive crashed onto the installation, releasing the Flood. At this point, it was revealed that the Ark had been constructing a new Installation 04, to replace the one which was destroyed by John This new Installation was only days from being complete. The Humans eventually decided to activate the new ring to stop the Flood, which in turn destroyed itself and damaged the Ark.
It is unclear how the system was affected by this, but if the Ark was rendered inoperable, the Halo system will have been irreparably damaged by the destruction of Installation 04 and Guilty Spark.
The Ross-Ziegler Blip , a tiny aberration in Earth's fossil records was discovered This was the result of the firing of the Halo Arrays.
The Installations are designed to be run by advanced Artificial Intelligence constructs specially purposed by the Forerunners. The highest Intelligence on each Installation is a single Monitor.
In addition, each Installation contains less intelligent constructs, known as Sentinels. The Sentinels serve virtually any purpose necessary to ensure that the Halo functions properly; they are also capable of combating small Flood outbreaks. Should a major Flood outbreak occur, heavier automatons, such as the Enforcers and Sentinel Majors will be created to assist the Sentinels. 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.
Save for the Monitor, all automatons can be constructed at specialized Sentinel Production Facilities that float high in the Halo's atmosphere. These Facilities have never been seen except briefly in the sky above the level Sacred Icon , one can be seen crashing as the player exits near the end of the level, the player then fights through the remains of it in Quarantine Zone , but they seem to contain limitless materials for constructing any number of automatons.
The Halo Installations were also designed to be habitable, and support a wide range of environments, habitats, ecosystems, and climates. Installation 04 and 05—respectively Alpha and Delta Halo—supported warm, temperate forests [19] that were both deciduous and coniferous, swamps, and cold, snow covered tundra environments.
However, if one observes the holograms of the Installations after stopping the Ark, one will see that the rings have different surface features and may have different atmospheres as well. While the terrain may appear to be naturally formed at first glance, it is actually artificially constructed.
Retrievers extract raw materials from the source, process them in transit, and deposit building materials at the Installation. These factories also hold in the ring's nitrogen-oxygen atmosphere, which is then leaked out to the surface, eventually pouring through the super-structure, and tugged in place by centripetal force.
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. Others, such as the myriad network of tunnels and cave systems that riddle the Installation's internal structure, are travel conduits used by the ring's Sentinels and Enforcers. There are also some life-forms that live naturally on the Halos. Whether these were created by the Forerunners or were brought to the Halos by them is unknown.
The first test deployments had proven the original rings to be unstable and too large to be practically deployed, generating enormous 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, [33] 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, [28] their location known only to the Master Builder. The final Array, activated at the conclusion of the Forerunners' conflict with the Flood, comprised seven rings, each 10, kilometers in diameter, one of them being the reduced Installation The first test of a Halo installation was conducted by Mendicant Bias , who fired Installation 07 in 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 year-long interrogation of it. Eventually, Mendicant Bias disappeared with Installation 07 after being corrupted by the Primordial. Following the use of a second Halo by Master Builder Faber to suppress 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 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 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 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, 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.
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. When a 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, [34] the Master Builder met the IsoDidact in the control room of Omega Halo and fired the ring, obliterating a small portion of the star roads laying siege on the Ark and cleansing the Large Magellanic Cloud of life.
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.
Together with Installation 07, these installations comprised the final Halo Array of seven rings. As Mendicant Bias and the Flood prepared their 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. The seven Halos then remained relatively dormant for approximately one hundred thousand years, though at least Installation 05 experienced a major Flood outbreak, while Installation 04 was visited briefly by other species, [42] including a major crash-landing in 40, BCE.
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 humanity discovered the Array in Several species indexed by the Library Project did not survive reintroduction to their homeworlds, and those that did were all reverted to a 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 " Great Journey " and join the Forerunners in godhood. Eventually, the stellar coordinates of Installation 04 were discovered through the combination of a crystal artifact on Sigma Octanus IV and a huge Forerunner artifact buried under the surface 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 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 Marines led by Captain Jacob Keyes accidentally broke quarantine again, expecting to find a large Covenant weapons cache. The battle finally culminated when Spartan John 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. By October 25 neutralization protocols had been established.
Later, the Covenant discovered a third Halo, Installation On this Halo, the Flood had already been released and much of the ring had been compromised, including its monitor, Penitent Tangent. Soon, another four-way conflict began. The ring was nearly activated by Tartarus , the 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 a generator of a portal to the actual Ark , a massive artificial world located outside the galaxy. Human and 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, Guilty Spark, John, and Arbiter Thel 'Vadam discovered that the Ark had been constructing a 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, [46] severely damaging the Ark in the process.
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