Editing Forerunner

{{Era|Forerunner|Post|FA}}

{{Disambig header|the species|the [[Halo 4]] campaign level or achievement|Forerunner (level)|Forerunner (achievement)}}

{{Species Infobox

|othernames=

|image=[[File:Didact_and_Librarian.jpg|325px]]<small>A Forerunner male [[Warrior-Servant|Warrior]] and female [[Lifeworker]].</small>

|homeworld=[[Ghibalb]]

|height={{Convert|198.1|cm|ft}}-{{Convert|414|cm|ft}}<ref name="waypoint forerunner"/>

|weight={{Convert|109.8|kg|lb}}-{{Convert|377.1|kg|lb}}<ref name="waypoint forerunner"/>

|lifespan=Indefinite with regular access to [[Forerunner personal armor|armor]]

|notable-group=[[Ecumene]]

|techlevel=Tier 1

|notable-person=

*[[Ur-Didact]]

*[[Faber-of-Will-and-Might|Master Builder]]

*[[Bornstellar's father]]

The '''Forerunners''' (Latin ''Primoris prognatus'', meaning "Firstborn")<ref name="waypoint forerunner">[https://www.halowaypoint.com/en-us/universe/species/forerunners '''Halo Waypoint - Universe''': ''Forerunners'']</ref> were an ancient species of [[Technological Achievement Tiers#Tier 1: World Builders|technologically advanced]] beings whose empire—known as the [[ecumene]]—encompassed three million fertile worlds in the [[Milky Way|Milky Way Galaxy]].<ref name="cryptum">'''Halo: Cryptum''', ''page 9''</ref> The Forerunners reigned for millennia as the ascendant civilization in the galaxy until the [[Great Purification|activation]] of the [[Halo Array]], their Pyrrhic solution to halt the [[Flood]], in [[97,445 BCE]]. Although they themselves are essentially extinct, evidence of their existence remained, spread across the galaxy in the form of numerous creations, installations and artifacts.

The Forerunners took upon themselves the role of caretakers of the galaxy, and believed that this "[[Mantle]]" had been passed down to them by the [[Precursor]]s, an even more powerful race that preceded the Forerunner civilization.<ref>'''Halo: Cryptum''', ''Epilogue''</ref> "Forerunner" is a literal translation of the species' name for themselves; they identified themselves as such because they believed that they held an impermanent place in the universe's [[Living Time]], though, in time, they too would be succeeded by other, superior races.<ref> '''Halo: Cryptum''', ''page 31''</ref> Before their disappearance from the galaxy, the Forerunners would name [[human]]ity their successors, identifying them with the title "[[Reclaimer]]".

In modern history, the alien hegemony known as the [[Covenant]] revered the Forerunners as gods, deriving much of their own technology from Forerunner artifacts found throughout the galaxy, and held that any who defaced these relics were [[heretic]]s.

{{Article Quote|One hundred thousand years ago, the [[Milky Way|galaxy]] was populated by a great variety of beings. But one species—eons beyond all the others in both technology and knowledge—achieved dominance. They ruled in peace but met opposition with quick and brutal effectiveness. They were the Forerunners—the keepers of the [[Mantle]], the next stage of life in the Universe's [[Living Time]]. And then they vanished.}}

[[File:Forerunner Meeting.jpg|275px|thumb|right|A group of Forerunners in combat skin discussing the Flood threat.]]

The Forerunners were created by the [[Precursor]]s, a powerful race responsible for seeding the Milky Way Galaxy with life and creating many other species, [[15,000,000 BCE|fifteen million years ago]].<ref name="waypoint forerunner"/> The Forerunners were seeded on the planet [[Ghibalb]] in the [[Orion complex]]. The world served as the hub of the Forerunners' fledgling interstellar civilization, comprised of twelve systems within the nebular complex, until it was rendered uninhabitable by an [[astroengineering]] disaster. The Forerunners had attempted to manipulate several stars in their region of space, but accidentally caused a series of [[supernova]]e that resulted in their planet being burned to a cinder by radiation. This event nearly caused the Forerunners' extinction.<ref>'''Halo: Cryptum''', ''page 222''</ref>

As their interstellar civilization developed, the Forerunners came to believe they would be judged worthy to be the inheritors of the Precursors' [[Mantle]] of guardianship of all life. However, over [[10,000,000 BCE|ten million years ago]], the Precursors made a decision to pass down the Mantle to humans instead. Provoked either by this revelation alone,<ref name="sil209">'''Halo: Silentium''', ''page 209''</ref> or the Precursors' alleged decision to eradicate the Forerunners as a "problematic" species,<ref>'''Halo: Primordium''', ''page 194'' (''"Long ago, when it became apparent that the Precursors were about to erase Forerunners, there was a war, and Forerunners erased ''them''."'')</ref> the Forerunners responded by [[Forerunner-Precursor war|overthrowing their creators]], exterminating most of them in retaliation.<ref name="sil209"/>

The Forerunners, led by the then-dominant [[rate]] of [[Warrior-Servant|Warriors]], began their thorough campaign of extermination in the Milky Way galaxy and later chased the last Precursors down to the [[Magellanic Clouds|satellite galaxy]] of [[Path Kethona]]. There, they would finish their work, eradicating all but a few Precursors who managed to elude them. However, some Forerunners began to question the ethics of the genocide and refused to take part; many were summarily executed, while others were exiled on a barren planet in Path Kethona without any advanced technology. [[Path Kethona Forerunner|This population]] would survive for millions of years, preserving the knowledge of their origins in a biological reservoir of ancestral memory. However, they would remain as the last survivors of the fleet that traveled to Path Kethona, as those who had carried out the genocide until the end never returned to the Milky Way.<ref>'''Halo: Silentium''', ''Strings 10, 11, 15''</ref>

Over the course of their history, the Forerunners fought each other in a number of civil wars, one of which took place over half a million years before their war against the Flood. To safeguard the Orion complex—the center of the ecumene's governance—during these conflicts, the Forerunners constructed the [[Maginot Line]], an immense array of [[Line installation|defensive installations]] spread out in a sphere which completely surrounded the Orion complex. This defense was meant to repel any possible enemy incursion, but it eventually proved vulnerable against an unconventional attack.<ref name="jatkrula">'''Halo: Silentium''', ''pages 104-105''</ref> During the civil wars, the [[Builder]] rate first rose to supremacy and initiated a cultural purge of the other rates, such as Warriors and [[Miner]]s, which involved the suppression of their ancient rituals.<ref>'''Halo: Silentium''', ''page 119''</ref>

The Forerunner civilization had cemented its place as the preeminent civilization in the galaxy by roughly [[150,000 BCE]],<ref>'''[[Halo Encyclopedia]]''', ''page 26''</ref> around the same time [[human]]ity first began moving its [[Prehistoric human civilization|first interstellar civilization]] away from their homeworld, supposedly to escape early Forerunner control.<ref>'''Halo: Cryptum''', ''page 20''</ref> The [[Capital]], the center of the Forerunner ecumene and the seat of the [[Ecumene Council]], was constructed around [[122,445 BCE]].<ref>'''Halo: Cryptum''', ''page 296''</ref> At some point in their history, the Forerunners fought a series of battles known as the [[Kradal conflicts]] in the galactic center.<ref>'''Halo: Silentium''', ''page 246''</ref>

===War with humanity===

The Forerunners perceived humanity's actions to be a threat to the principles of the Mantle, and therefore waged a decisive war against humans, subjugating every human-controlled world and wiping them clean of all traces of human civilization. As punishment, humanity was stripped of its empire and technology and was exiled to its homeworld, [[Earth|Erde-Tyrene]]. There, humanity was devolved, splintered among its collective species and forced to begin anew.<ref name="Cryptum 25"/><ref>'''Halo: Cryptum''', ''pages 127 and 188''</ref> The Flood, meanwhile, had been pushed beyond the edge of the galaxy by humanity's military efforts and was not seen again for nearly nine millennia.<ref name="c267"/>

When the Forerunners were unable to contain the Flood outbreak, the galaxy entered a state of war. The Forerunners desperately studied the Flood, looking for any exploitable weakness. As the Forerunners soon realized that conventional naval tactics were ineffective against the parasite's onslaught, they developed new weapons and tactics to combat the Flood. The [[Sentinel]]s were deployed as a means of maintaining the Flood through surgical, localized tactics. Eventually, the [[Forerunner fleet]] began to enact premature stellar collapse within compromised planetary systems, causing [[supernova]]e to engulf entire worlds.<ref>'''Halo Encyclopedia''', ''page 169''</ref> However, these tactics proved only to slow, but never stop the expansion of the Flood. Even at this late hour, the Forerunners were reluctant to use the Halo Array, believing that they should continue to embrace the Mantle and to protect life rather than to destroy it. This led to great stretches of anguished debate and even civil war.<ref>'''Halo Encyclopedia''', ''page 172''</ref>

[[File:TerminalArkArray.jpg|thumb|right|275px|The Halo Array over the Ark, awaiting its distribution across the galaxy.]]

After nearly three centuries of war, what had been a relative stalemate quickly began to turn in the Flood's favor. The [[Gravemind]] managed to convince [[Mendicant Bias]], the AI in charge of Forerunner defense, to unite with the Flood and turn its military assets against its creators. With the Flood growing at an exponential rate, entire [[thema]]s of the ecumene were overrun; the Flood-infested regions, known as [[Burn]]s, soon covered two-thirds of Forerunner space.<ref>'''Halo: Silentium''', ''page 190''</ref> The Forerunners eventually resorted to the [[Maginot Line]], leaving all systems beyond the [[Orion complex]] to fend for themselves.<ref name="jatkrula"/> Meanwhile, the Flood and the Graveminds developed into more capable and [[Key Mind|powerful forms]], enabling them to tap into Precursor [[neural physics]] and control Precursor artifacts scattered across the galaxy. The Forerunners possessed no effective defense against these constructs and the Flood won most naval engagements as a result.<ref name="sil214">'''Halo: Silentium''', ''pages 214-215''</ref>

After the Flood overwhelmed the [[Capital]] system, the surviving leaders and population of the ecumene were relocated on the extragalactic installation known as the [[greater Ark]], the original [[Ark]] used to manufacture the first Halo rings.<ref name="sil214"/> Aware that the Ark would not stay safe from the Flood for long, the Forerunner leadership realized that the only way to stop the parasite was to deprive it of all hosts by firing the Halo Array.<ref name="twobetrayals"/> Soon after this decision, the Flood attacked the greater Ark and destroyed it. With most of the Forerunner leadership and population dead, the few surviving Forerunners, led by the [[IsoDidact]], journeyed to [[Installation 00]], the lesser Ark, its location still hidden from the Flood. The IsoDidact had the Halos distributed across the galaxy and activated the rings, killing all sentient life of sufficient biomass in the [[Milky Way]], including any surviving Forerunners within the range of the Halo effect.<ref>'''Halo 2''', campaign level ''[[The Great Journey]]''</ref> However, the Forerunner [[Lifeworker]]s had managed to save some of the galaxy's species by transporting them to the Ark during the [[Conservation Measure]].<ref name="h3terminals"/><ref>'''Halo Legends''', ''Origins''</ref> All neural structures within the Halos' range were destroyed; these included all [[Precursor]] artifacts, including the [[Domain]], which the Forerunners had come to regard as the foundation of their culture.<ref name="sil322">'''Halo: Silentium''', ''pages 322-323''</ref>

[[File:Keyships.png|thumb|right|275px|Keyships departing to reseed life in the galaxy.]]

{{Quote|no=two|q1=We will do what we can with what we are given. But what of you? Where will the Forerunners live?|Riser|q2=I do not know, not yet. All I know for certain is that we cannot return to these places. We have already meddled too much in the affairs of others.|IsoDidact|[[Riser]] and the [[IsoDidact]] as they bid farewell on a repopulated Earth.<ref name="rebirth"/>}}

A number of Forerunners survived the firing of the Halo Array. Some managed to take refuge on Installation 00, safely out of the Array's range, while the Halo effect swept over the galaxy; most notably, this included the Lifeworkers assigned to installation and the IsoDidact. Based on limited information prior to the firing of the Halos, most of the other rates were believed to have perished on the greater Ark.<ref>'''Halo: Silentium''', ''page 314''</ref> However, several Warrior-Servants were shown to be present later on, indicating that more Forerunners may have survived to take shelter on the lesser Ark than previously predicted.<ref name="rebirth">'''[[Halo: Rebirth]]'''</ref>

After the remaining Forerunners had made sure that the Halos had done their work and the Flood had been eliminated, the species that were preserved on the Ark were returned to their home planets. This was done by the remaining Forerunners under the leadership of the new [[Lifeshaper]], [[Chant-to-Green]], who received the title from the Librarian before the latter stranded herself on Earth at the endgame of the Flood war. After the reseeding of the galaxy was complete, the remaining Forerunners exiled themselves, as, according to the IsoDidact, they were done meddling in the affairs of others.<ref name="rebirth"/> This exile has also been referred to as a "Great Journey" by the IsoDidact, who wished to bear the record of the Forerunner civilization's failures and their ultimate sacrifice for future generations.<ref name="h3terminals"/>

Apart from the Forerunners sheltered on the Ark, the [[Ur-Didact]] also survived, having been imprisoned in a [[Cryptum]] in the [[shield world]] [[Requiem]]. [[343 Guilty Spark]] believed that the [[Librarian]] had also survived;<ref>'''Halo: Primordium''', ''page 379''</ref> however, this information is of questionable veracity, given first-hand accounts of the Librarian spending her last moments stranded on Earth when the Halos were fired.<ref name="h3terminals"/><ref>'''Halo: Silentium''', ''pages 323-325''</ref> While the survival of the Librarian herself is dubious at best, she did upload a personality impression of herself [[Librarian's Rest|on Requiem]] to guide humans if they later stumbled on the installation.<ref>'''Halo 4''', campaign level ''[[Reclaimer (level)|Reclaimer]]''</ref>

The first known species to make use of reverse-engineered Forerunner technology were the [[Sangheili]] and [[San 'Shyuum]], having evolved on worlds rich in Forerunner artifacts. Regarding these artifacts and their creators with religious reverence, [[San 'Shyuum Schism|many]] [[Sangheili-San 'Shyuum war|wars]] broke out over whether the relics should be left in peace or used to advance their own technology.<ref>'''[[Halo: Contact Harvest]]''', ''pages 146-147''</ref> Those who believed the latter came together to form the hegemony known as the [[Covenant]], who together created a [[Covenant religion|complex religion]] based around venerating the Forerunners as gods. Due to misinterpreting the ancients' records, the Covenant believed that the Forerunners disappeared from the galaxy after the [[Halo Array]] elevated their species to a state of trans-sentient godhood. As such, they appropriated many Forerunner technologies and artifacts, with the use of [[Luminary|Luminaries]] that allowed them to track Forerunner-made objects all across the galaxy. The most holy of these artifacts, the "Sacred Rings" or [[Halo Array|Halo installations]], were constantly searched for 1700 years, since the Covenant believed themselves to be the chosen inheritors of the Forerunners' legacy,<ref>'''[[Halo Evolutions - Essential Tales of the Halo Universe]]''' volume II, ''page 299''</ref> and by locating and activating the Halo Array, they believed that they too could follow the Forerunners into godhood.<ref>'''Halo 2''', campaign level ''[[Sacred Icon]]''</ref> This was referred to as the "[[Covenant religion#The Great Journey|Great Journey]]" by the Covenant races.<ref>'''Halo 2'''</ref><ref name="ch"/> This mimicry of the Forerunners' remnants caused the Covenant to rise to a [[Technological Achievement Tiers|high technological tier]] very quickly, but additionally stunted their innovation of said technology and kept them from uncovering its true potentials.<ref>'''[[Halo: The Fall of Reach]]''', ''page 241'' ''page 275 2010 reprint''</ref><ref>'''[[Halo: First Strike]]''' ''page 87''</ref>

[[File:Relic main.png|thumb|left|225px|Humans examine a Forerunner [[relic]] on [[Harvest]].]]

As for humanity, they had been chosen by the Forerunners to carry the title of "[[Reclaimer]]" and eventually take over the Mantle. The Librarian had imparted humanity with a species-wide ''[[geas]]'';<ref>'''Halo: Primordium''', ''page 375''</ref> these genetic instructions include an innate familiarity with Forerunner technology.<ref>'''Halo: The Flood''', ''pages 84, 146, 170''</ref><ref>'''Halo: First Strike''', ''page 142''</ref> However, humans themselves were unaware of this and came into contact with Forerunner artifacts relatively late in their history, after they had [[Human colonies|colonized]] many planets. In [[2491]], a [[Assembly|collective]] of human [[artificial intelligence]]s uncovered the presence of Forerunner relics on [[Onyx]] and kept them hidden in the meantime for fear that humanity was not yet ready to use such advanced technology. As such, archaeological excavations did not uncover them until [[2511]], and the [[United Nations Space Command|UNSC]]'s [[Office of Naval Intelligence]] responded by hiding the planet's location and [[Zone 67|securing the area]]. However, little progress was made in translating any of the relics.<ref>'''Halo: Ghosts of Onyx''', ''pages 122-127''</ref> Other relics were discovered on [[Reach]], [[Earth]], and many other colonies. A Reach [[titanium]] mine had been shut down when they breached [[Menachite Forerunner complex|a Forerunner complex]], and [[SWORD Base|SWORD]] and [[CASTLE Base]] were built to guard relics' locations.<ref>'''[[Halo: First Strike]]''', ''page 108''</ref> The [[Portal at Voi]] was buried under [[New Mombasa]] and undiscovered until much later, prompting ONI to construct a [[ONI Alpha Site|major facility]] to study and cover up the structure from the general population.<ref>'''[[Halo: The Essential Visual Guide]]''', 'page 132''</ref> Mixed reactions came from scientists who studied the artifacts, some fascinated by their potential, others fearful for the possibility of a two-front war.<ref>'''Halo: The Fall of Reach''', ''Chapter 25''</ref>

[[File:Reach Halo in Halo Reach.png|right|thumb|225px|The discovery of Installation 04 was the turning point of the Human-Covenant war.]]

Forerunner artifacts became instrumental to beginning and ending the [[Human-Covenant War]]. First contact was made when humanity's Reclaimer status was discovered by the Covenant, who did not understand that they were being labeled as Forerunner objects. The [[Hierarchs]] of the Covenant soon learned humanity's status as apparently living descendants of their supposed gods, and found it potentially destructive to their religion. Thus they decided to hide this information from the general population and ordered that humanity be eradicated, a goal in which they nearly succeeded.<ref>'''Halo: Contact Harvest'''</ref> Battles were fought often with relics at the center of the conflict, sometimes risking giving the Covenant victory early, other times hindering them and turning in favor of humans due to the Covenant's reluctance to damage Forerunner treasures. Many relics were destroyed by humans often as traps for Covenant or to keep them from falling into enemy hands.<ref>'''Halo Wars''', campaign levels ''[[Reactor]]'', ''[[Escape]]''</ref><ref>'''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''', ''[[Dirt]]''</ref>

The most important of Forerunner artifacts to be involved was the Halo Array, [[Installation 04|the first ring]] of which was discovered on the heels of the destructive [[Fall of Reach]].<ref>'''Halo: Combat Evolved''', campaign level ''[[The Pillar of Autumn (Halo: Combat Evolved level)|The Pillar of Autumn]]''</ref> The resulting [[Battle of Installation 04]] revealed to humanity the existence of the Forerunners and their sacred place in the Covenant's religion, as well as the rings' true purpose as weapons of mass destruction. The activation of the Halos led to the awakening of other Forerunner relics, such as the [[Onyx Sentinel|Sentinels of Onyx]], or [[Installation 00|the Ark]] that controlled the Halo Array. Humanity's utilization of Forerunner tech was thus regarded as a "game-changer" to turn battles into their favor<ref>'''Halo: Reach''', campaign level ''[[The Package (level)|The Package]]''</ref> and also changed the goal of the war, now to keep the Covenant from reactivating the Array in their misguided pursuit of apotheosis. As the conflict drew to a close, the Covenant had been plunged [[Great Schism|into disarray]] as some discovered the Great Journey was false and thus [[Swords of Sanghelios|allied with humanity]].<ref>''Halo 3'''</ref> [[Battle of Installation 00|The final battle of the war]] was fought aboard the Forerunners' Ark, and the UNSC and Covenant separatist forces together secured the Halo Array, destroying the Ark shortly afterward. In the post-war years humanity was beginning to reclaim its appointed place, gaining many technological leaps as a result of acquiring and reverse-engineering Forerunner technology with the assistance of a number of [[Huragok]] they had managed to procure.<ref name="ttw">'''Halo: The Thursday War'''</ref>

[[File:H4 John-117 Didact first encounter.jpg|thumb|275px|The Didact overpowers John-117.]]

The years following the end of the [[Human-Covenant War]] saw the revival of a Forerunner presence in the galaxy, with the reawakening of the [[Ur-Didact]], once the supreme commander of the Forerunner Warriors-Servants. A zealous Forerunner supremacist with a renegade hatred of humans, the Ur-Didact sought to use a machine known as the [[Composer]] to convert all of humanity into subservient war machines near the end of the Forerunners' war with the Flood. To prevent this, the [[Librarian]] imprisoned the Didact in a Cryptum on the shield world [[Requiem]], where he remained for the next 100,000 years.

In [[2557|July 2557]], the Ur-Didact and his mechanized [[Promethean]] forces were accidentally awakened by [[SPARTAN-II Program|Spartan]] [[John-117]] who had stumbled upon Requiem. His views unchanged by his long exile, the Didact disregarded humanity's Reclaimer status and maintained his belief that only the Forerunners were worthy of the Mantle. The Didact and his Prometheans, allied with a [[Jul 'Mdama's Covenant faction|new Covenant faction]], went to war against humanity, aiming to prevent them from claiming the Mantle to themselves. Attempting to use the Composer to neutralize humanity, the Didact [[New Phoenix Incident|attacked Earth]]. However, the Master Chief and his [[Smart AI|AI]] [[Cortana]] stopped and defeated him, destroying the Composer and the [[Mantle's Approach|Didact's ship]]. They were aided in this by the Librarian, who had left an imprint of her memories behind on [[Requiem]]. The Librarian's essence augmented the Master Chief's genetic code in order to allow him to face the Didact, giving him, along with other things, an immunity to the Composer that saved his life. However, the Promethean-Covenant alliance was not defeated by this setback and the conflict was still in progress in early [[2558]] when the {{UNSCShip|Infinity}} [[Requiem campaign|returned to Requiem]]. After a lengthy campaign, Requiem was destroyed by the Covenant leader [[Jul 'Mdama]], along with all Promethean constructs present on the shield world.<ref name="halo 4">'''Halo 4'''</ref>

[[File:H4-Terminal-Didact.jpg|thumb|275px|The Ur-Didact, a full-rate Promethean, before undergoing a procedure to achieve Flood immunity which left him disfigured.]]

The Forerunners were a bipedal species resembling humans in overall shape, though they were larger in stature. Over the course of their lives, Forerunners underwent a number of [[Forerunner mutations|artificially-induced mutations]], modifying their bodies to better suit the field of work of their [[rate]]. More specific aspects of their appearance varied with lineage, age and even personal tastes.<ref name="waypoint forerunner"/> They relied heavily on [[Forerunner personal armor|personal body-assist armor]] which, in addition to protecting the wearer from harm, augmented their physiology and mental faculties. Among many other advantages, it made their lifespans virtually indefinite by providing constant life support and medical care.<ref name="c47">'''Halo: Cryptum''', ''page 47-48''</ref><ref group="note">It is never directly stated that the Forerunners' armor granted them truly indefinite lifespans, although this can be inferred from several statements in ''The Forerunner Saga''. In ''Halo: Cryptum'', Bornstellar notes that Forerunners died only on rare occasions, usually by accident or during war (''Cryptum'', page 47). In ''Halo: Silentium'', the Librarian mentions having visited the collection of a former [[Theoretical]] on [[Keth Sidon]] (''Silentium'', page 67); since the Theoretical rate was dissolved a million years earlier, the former Theoretical would have been at least a million years old at the time, although it is not explicitly stated that the Theoretical in question was still alive.

Nonetheless, ''Halo 4: The Essential Visual Guide'' asserts that the Composers were originally designed to transfer old essences into youthful bodies. While this may seem rather trivial given the Forerunners' effective immortality, it is known that older members of the species (such as the [[Confirmer]]) could become significantly disfigured with age. [https://www.halowaypoint.com/en-us/universe/tech/composer The Composer entry on Halo Waypoint] reiterates ''The Essential Visual Guide''<nowiki>'</nowiki>s statement and further reveals that composed essences may have been integrated into the Domain, granting them true permanence.</ref>

 

The Forerunners exhibited sexual dimorphism largely mirroring that of humans, with the females being more slender and somewhat smaller in stature than the males. The height of higher-form males ranged from around three to four meters; for example, the [[Ur-Didact]] was three and a half meters tall,<ref name="evgdidact">'''[[Halo 4: The Essential Visual Guide]]''', ''page 16''</ref> while [[Bornstellar's father]], a high-ranking Builder, was around four meters. [[Bornstellar's mother]], a female Builder of the same social standing, was just over two meters in height,<ref>'''Halo: Cryptum''', ''page 224-225''</ref> while the [[Librarian]], head of the Lifeworker rate, was nearly three meters tall.<ref>'''[[Halo 4: The Essential Visual Guide]]''', ''page 17''</ref> Males of higher forms also bore less resemblance to humans, while the females appear to have been more human-like in appearance.<ref name="prim33"/> A large portion of this dimorphism was artificially induced with their mutations and determined by rate.<ref name="sil141">'''Halo: Silentium''', ''page 141''</ref>

 

Their skin color ranged greatly, including gray, black, blue, pink, or a mixture thereof. The number of fingers Forerunners possessed varied according to their rate and form; the most common number of fingers per hand appears to have been six, with two opposable thumbs,<ref>'''Halo: Primordium''', ''page 339''</ref><ref>'''Halo: Silentium''', ''page 83''</ref> although some [[Lifeworker]]s could have as many as seven fingers per hand.<ref>'''Halo: Primordium''', ''page 166''</ref> Meanwhile, the [[Librarian]] had only five fingers in each hand,<ref name="halo 4"/> although this was a deviation from the norm.<ref name="sil141"/>

While the Forerunners had a biological need to sleep, this necessity was eliminated by the use of personal armor which allowed them a constant continuity of consciousness without having to sleep;<ref>'''Halo: Cryptum''', ''page 241''</ref> only on rare cases, they would experience diagnostic waking dreams.<ref>'''Halo: Silentium''', ''page 150''</ref> As such, Forerunners slept very rarely, mostly doing so by choice in instances such as long stretches of space travel, which themselves were rare due to their exceedingly fast slipspace technology.<ref>'''Halo: Silentium''', ''page 63''</ref>

When a [[Manipular]] was ready to work within a particular rate, they would undergo an artificially-induced transformation into a more advanced [[form]], which differed depending on the Manipular's chosen caste. Referred to as a "mutation", the transition typically occurred over a long period of time.<ref>'''Halo: Cryptum''', ''page 225''</ref> A typical Forerunner would undergo several mutations over the course of a lifetime, though this was not always the case. Mutations altered Forerunners' abilities and physical shape to suit their class; Warrior-Servants, for example, underwent mutations that made them stronger and more robust. After their first mutation, Forerunners also gained the ability to access the [[Domain]], a realm of information where the entire collated knowledge of the Forerunner civilization was contained.<ref>'''Halo: Cryptum''', ''page 167-168''</ref>

The Forerunners themselves were a race almost entirely without conflict; although political disputes were not uncommon, violence or war between Forerunners was almost unheard of, the last Forerunner civil wars having been fought half a million years before their civilization's end.<ref name="jatkrula"/> As such, the [[Warrior-Servant]]s, who conducted most of the Forerunners' military operations, were often looked down upon by the higher rates, as their actions were perceived to be contradictory to the Forerunners' role of preserving life. While they generally strove for peace, when provoked to a war, the Warrior-Servants would carry out the war ruthlessly and thoroughly, as they believed defiance of their rule was equal to showing contempt to the Mantle itself.<ref name="cryptum2">'''Halo: Cryptum''', Chapter 2</ref> One example is the human-Forerunner wars, where many humans were executed following their defeat, and all traces of human achievement was erased from the galaxy.

Forerunner culture was highly stagnant; the fundamental aspects of their society—such as their [[rate]]-based social hierarchy—remained unchanged for millions of years.<ref>'''Halo: Silentium''', ''page 14''</ref> The Forerunners had a rigid social structure, where one's position would be determined mainly by their rate, part of a complex system of different social classes mainly based around a particular occupation. Cultural practices and customs varied by rate and position; generally, Forerunner culture was full of formality and ritual, particularly with the [[Builder]]s, the highest of the rates. Forerunners placed a great deal of value on family lineage and tradition, and one's rate and social standing were largely hereditary.<ref>'''Halo: Cryptum''', ''page 242''</ref> When [[Growth-Through-Trial-of-Change]], born to a Builder family, chose to become a Lifeworker instead, she was treated as an outcast by her family.<ref name="rebirth"/>

A central aspect of Forerunner culture was the [[Domain]], a vast repository of information containing virtually all knowledge collated by the Forerunners over the eons, including impressions the deceased,<ref>'''Halo: Silentium''', ''page 255''</ref> leading the Forerunners to also view the Domain as a form of afterlife.<ref>'''Halo: Silentium''', ''page 275''</ref> Although the Domain permeated Forerunner society for countless millennia, its origin or true nature remained mysterious to the Forerunners themselves. The Domain was best understood by the monastic class of [[Haruspis|Haruspices]], who dedicated their lives to the study of the Domain.<ref>'''Halo: Silentium''', ''pages 241-242''</ref> While unknown to the Forerunners, the Domain was actually a [[neural physics]]-based Precursor construct, and as such was destroyed when the Halos fired, taking most of the Forerunners' recorded history and knowledge with it.<ref name="sil322"/>

Despite their lack of need to sleep as a result of the use of personal armor, Forerunners had certain moments where each member of a household would retreat for several hours of individual meditation. These moments were typically arranged according to the local day-night cycle, and were sacrosanct in traditional Builder families. During this time, the activities on an entire planet would slow down, including traffic and even the operations of [[ancilla]]s.<ref>'''Halo: Cryptum''', ''page 241''</ref>

Forerunners did not eat meat, as the Forerunners' scripture surrounding the Mantle forbade "the eating of the flesh of unfortunates".<ref>'''Halo: Cryptum''', ''page 88''</ref> Taking one's own life was also gravely forbidden.<ref>'''Halo: Cryptum''', ''page 99''</ref> Despite their in many ways conservative society, nudity or sexuality were not considered taboos in Forerunner culture; the rite of mutation, for example, required both participants to be naked, although there were no sexual connotations associated with the procedure.<ref>'''Halo: Cryptum''', ''page 153''</ref>

Forerunner society was divided into a number of different classes known as rates, each rate specializing in a particular field of work. The [[Builder]]s, who designed most Forerunner technology, from ships and weapons to their various megastructures, were the highest rate and wielded the most political power. The second rate were the [[Miner]]s, who obtained construction materials for the Builders' projects and were responsible for planetary and stellar engineering. Below the Miners were the [[Lifeworker]]s, who were responsible for medicine and biological research. The [[Juridical]]s were a rate whose duties encompassed legal matters within the ecumene. The [[Warrior-Servant]]s, the primary fighting force of the ecumene, were the second-lowest rate. The lowest rate were the [[Huragok|Engineers]], artificial beings who were tasked with constructing and operating Forerunner structures and machinery.<ref>[[Halo: Cryptum/Glossary|'''Halo Waypoint''': ''Halo: Cryptum Glossary'']]</ref>

Forerunner customs involving marriage were said to be complex; they married for a variety of reasons, though it was said that the lower rates married more often for love,<ref>'''Halo: Cryptum''', ''page 77''</ref> while there were often more complex reasons such as familial relations involved in the courtship of higher rates such as Builders.<ref>'''Halo: Cryptum''', ''page 225''</ref> Intermarriage between rates was not unheard of; for example, the [[Ur-Didact|Didact]], a Warrior-Servant, married the [[Librarian]], a Lifeworker. Additionally, a certain degree of courtship between rates was considered commonplace before individuals were espoused to formal marriage.<ref>'''Halo: Cryptum''', ''page 231-232''</ref> Polygamy was also an accepted practice, at least among the higher rates, as demonstrated by [[Master Builder]] [[Faber-of-Will-and-Might|Faber]] having many wives.<ref>'''Halo: Silentium''', ''page 251''</ref> At certain points in their lives, females would enter a "millennial interim", a period when they would not bear children.<ref>'''Halo: Cryptum''', ''page 224''</ref>

Forerunners spoke a variety of languages. Some dialects were older than others, and accordingly were less widely used. [[Digon]] was an ancient language used by [[Promethean]]s, while [[Jagon]] was a slightly less old language used by [[Builder]]s.<ref>'''Halo: Cryptum''', ''page 227''</ref>

The most commonly encountered system of [[Forerunner symbols|Forerunner glyphs]] seems to be based on a series of circular, complex shapes. The glyphs have been inscribed almost everywhere Forerunners were once present, from different areas of Earth, to the Halos. They were also known to put these glyphs and symbols onto their weapons, machinery and clothing, something the Covenant also copied, evident with the Forerunner symbols placed on the hilt of the [[Type-1 Energy Weapon/Sword|energy sword]] and on the [[Sangheili combat harness]]. Among the most well-known glyphs are the "[[Mantle]]" and "[[Reclaimer]]" symbols, as well as the [[sigil]]s of individual Forerunners.<ref name="halo 4"/> Some variations of Forerunner symbology possess a strangely attractive, even disorienting quality to humans.<ref>'''Halo: First Strike''', ''page 142'' (2003)</ref>

Forerunner names had concrete meanings in their language, and commonly consisted of a combination of words expressing positive attributes in a grandiose, somewhat poetic manner. In many cases, a Forerunner's name was associated with typical terminology involved with the practices of the rate they were born into; for example, "Bornstellar-Makes-Eternal-Lasting" reflects his Builder lineage. In informal conversation, these names were typically shortened, with only a single part being used.<ref>'''Halo: Cryptum''', ''page 261''</ref><ref group="note">In ''Halo: Silentium'' and subsequent media, the words comprising Forerunner names are joined by hyphens, whereas in ''Halo: Cryptum'' and ''Halo: Primordium'', they are separated with spaces.</ref>

Many, though not all, higher-ranked or older Forerunners were only known by a title not given at birth but rather adopted at one point in the Forerunner's life, often originating as a sobriquet given to that individual due to one of their traits; for example, the Didact, born Shadow-of-Sundered-Star,<ref name="evgdidact"/> gained the name "Didact" from his students while teaching in the [[College of Strategic Defense of the Mantle|War College]].<ref>'''Halo: Cryptum''', ''page 227-228''</ref> [[Manipular]]s were identified as "Form Zero" in their full names.<ref>'''Halo: Cryptum''', ''page 33''</ref>

When a Forerunner died (usually by accident or, on rare occasions, during war) elaborate ceremonies would be enacted before their remains were disposed of in fusion fires associated with the activities of their rates — a melting torch or planet cutter, for example.<ref name="c47"/>

First, the Forerunner's last memories would be extracted from their armor, which [[Mind transfer|preserved]] a few hours of the occupant's mental patterns. This reduced splinter of personality would be placed in a [[timelock|time-locked]] [[Durance]] with a half-life of more than a million years. The body would then be torched in a solemn ceremony attended only by close relations. A bit of plasma from the immolation was preserved by the appointed [[Master of the Mantle]], who secured it along with the essence in the Durance. The Durance was then given to the closest members of the dead Forerunner's family, who were charged with making sure that it would never be abused. Families and rates were very protective of such places, and tampering with a family Durance was considered sacrilege.<ref name="c47"/>

Traditionally, Forerunner space travel involved several rituals. When a Builder family was returning from an interstellar journey, the entire family would stand at the bridge deck and observe the ship's approach. The senior family member would issue commands in ancient Jagon. These actions were entirely ceremonial, as nearly all Forerunner ships were controlled by an ancilla.<ref>'''Halo: Cryptum''', ''page 227''</ref>

During prolonged space journeys, Forerunners would often play "diverting games" through their armor to pass the time.<ref>'''Halo: Cryptum''', ''page 129''</ref>

[[File:Forerunner AI.jpg|thumb|right|275px|A [[Sentinel]] and a [[Monitor]]. Both are Forerunner creations with specific tasks.]]

The Forerunners' technological achievements were without parallel in the known galaxy. They managed to create solidified surfaces out of light by using technology known as [[hard light]], use [[Slipstream space|slipspace]] to [[Slipspace translocation|teleport]] between locations almost instantaneously, and create numerous forms of advanced machinery. Another of their greatest achievements is their ability to initiate premature stellar collapses of stars and create planets in less than 10,000 years. The [[Halo Array]] and the [[shield world]]s are, above all others, the most significant pieces of surviving Forerunner technology. The planet Onyx and its inner [[Dyson sphere]], [[Trevelyan|Shield World 006]], in particular demonstrated both their ability for engineering on a grand scale, and their near-transcendent grasp of slipspace technology. Forerunner technology is remarkably resilient, being able to remain intact for over a hundred millennia.<ref>'''Halo: Combat Evolved'''</ref>

They employed a wide variety of [[artificial intelligence]] constructs, generally known to them as [[ancilla]]s. These ranged from simple personal assistants integrated in their armors to various kinds of robotic [[Monitor]]s and immensely powerful [[metarch]]-level AIs, of which the most sophisticated type was the [[Contender-class artificial intelligence|Contender-class]].<ref name="h3terminals"/>

In addition to their superior grasp of slipspace travel, the Forerunners had mastered many other methods of higher-dimensional manipulation. They were capable of altering the fabric of time and space within [[Slipspace bubble|contained "bubbles" of slipspace]], allowing the storage of enormous masses and volumes within a comparatively tiny space; as an extreme example, the 300-million-kilometer [[Trevelyan|Shield World 006]] was held in a space only 23 centimeters in diameter in normal space. In these bubbles, the flow of time could be [[Timelock|suspended altogether]], or numerous millennia could be made to transpire while only seconds had passed in normal space.<ref>'''Halo: Primordium''', ''page 366''</ref> The Forerunners routinely employed the higher dimensions of slipspace in their fleet engagements and created defenses which extended into slipspace,<ref>'''Halo: Silentium''', ''page 211''</ref> most prominently the [[Maginot Line]].<ref>'''Halo: Blood Line'''</ref>

Forerunner technology could also produce certain objects remarkably quickly without extensive production facilities. For example, personal armor could be manufactured by small engineering units onboard a starship,<ref>'''Halo: Cryptum''', ''page 106''</ref> and entire ships could be "grown" from a "[[design seed]]", being manufactured on-site from preprogrammed "blueprints" and construction materials obtained from local resources. Likewise, certain automatons — such as [[Promethean Crawler]]s — could be "conjured" on-site and constructed in a matter of seconds from raw materials present in the ground.<ref name="halo 4"/> Most Forerunner technology could disassemble and reconfigure itself into a completely different form, and automatically gather any additional construction materials if necessary; this was demonstrated when the [[Librarian]] had a {{Class|Gargantua|transport}} use both itself and resources mined locally to construct the [[Portal at Voi]].<ref>'''Halo: Silentium''', ''page 324''</ref> The Forerunners did use dedicated production plants for large-scale industry. An example of this is the vast [[Sentinel manufacturing facility]] on [[Onyx]], which could produce a new [[Onyx Sentinel|Sentinel]] every six seconds.<ref>'''Halo: Ghosts of Onyx''', ''page 316''</ref>

Forerunner spacecraft used special [[Slipspace flake|crystals]] embedded in their [[slipspace drive]]s to travel through slipspace. In order to move through ordinary space, they utilized [[reaction drive]]s which harnessed virtual particles as a propulsive force; however, they still required the use of onboard reaction mass.<ref name="c124">'''Halo: Cryptum''', ''page 124''</ref> The reaction drive of a mere automated cargo transport allowed travel from Edom to Erde-Tyrene, (a distance of 100 million kilometers at the time), within forty-eight hours; this was considered a mundane trip that did not warrant slipspace manipulation.<ref>'''Halo: Cryptum''', ''pages 19 and 20''</ref> In addition, the Forerunners created a network of [[slipspace portal]]s for high-traffic slipspace transit across the galaxy.<ref>'''Halo: Cryptum''', ''page 200''</ref> Aboard starships, limited inertial dampening was achieved through the use of buffer fields,<ref>'''Halo: Cryptum''', ''page 114''</ref> but during extreme acceleration, the occupants' armors had to be locked to the deck.<ref>'''Halo: Cryptum''', ''page 129''</ref>

Forerunner warships could be enormous in scale; the most recent models of [[Fortress-class vessel]] were around a hundred kilometers in length,<ref>'''Halo: Cryptum''', ''page 312''</ref> while the [[Ur-Didact|Didact]]'s personal command vessel, ''[[Mantle's Approach]]'', was 341 kilometers in height and was even then surpassed in size by the largest Forerunner ships.<ref name="h4evg193">'''Halo 4: The Essential Visual Guide''', ''page 193''</ref>  

The interiors of all Forerunner ships were not entirely composed of matter; for example, the structure of a [[planet-breaker]] was only half matter, with one third being fuel and reaction mass and the rest being comprised of [[hard light]], allowing the captain to configure the ship's internal layout and decoration at will. At least some types of Forerunner craft can alter their geometry to better suit their current situation; for example, making the ship more aerodynamic in preparation for surface landing.<ref name="c124"/>

Forerunners used a type of quantum entanglement for [[superluminal communications|communications]], allowing instant data transfer over vast distances. These communications were routed over proprietary encryption protocols, which could be used to track the source or destination of the communication.<ref>'''Halo: Cryptum''', ''page 125''</ref> Forerunners did not use electromagnetic radiation (light, radio, microwaves, etc.) to communicate,<ref>'''Halo: Cryptum''', ''page 144''</ref> presumably due to latency, interference, and security issues. They also used a form of superluminal communication involving wormholes; however, these communications were significantly slower than communication via the [[Domain]].<ref>'''Halo: Combat Evolved Anniversary''', ''[[terminal/Halo: Combat Evolved Anniversary|Terminal 4]]''</ref>

Forerunner sensors were capable of instantaneous scanning and detection across interstellar distances. As a particularly impressive example of their available sensor ranges, the Forerunners' [[core authority]] routinely tracked individual slipspace jumps across the galaxy.<ref>'''Halo: Cryptum''', ''page 136''</ref> They were also capable of viewing various alternate spaces adjoining the physical universe—including [[denial of locale]], [[natal void]], [[shunspace]], [[trick geodetics]] and a photon-only realm known as [[the Glow]]—and ascertaining events or objects in normal space through their signatures sometimes visible in these realms.<ref name="c100"/> Forerunners shipboard sensors were also highly accurate, being capable of providing a detailed analysis of a single planet's geological and ecological composition from lightyears away through the use of long-range entanglements.<ref>'''Halo: Silentium''', ''page 121''</ref>

The Forerunner government used an automated network to collate data from all technological equipment across their ecumene, from mundane devices such as a [[jetbrush]] to communications satellites and [[space station]]s; overseen by non-intelligent automatons, the system filtered unusual observations and relayed possible significant anomalies to the authorities, specifically the [[Prelate]]. Such anomalies included catastrophes or "Xenovents" - supposedly referring to contact with alien lifeforms. This is how the Forerunners first learned of the Flood's reemergence around [[97,745 BCE]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe (Volume I)''', "Soma the Painter", ''page 10''</ref>

The Forerunners were capable of extracting an individual's complete mental and biological patterns and memories, which could then be encoded in either another biological body or stored as data. A Forerunner could create an offshoot of their consciousness housed in an ancillary system, as the [[Librarian]] did on [[Requiem]].<ref>'''Halo: Silentium''', ''page 297''</ref> An individual's pattern could also be imprinted over another body; an example of this was the [[Ur-Didact]]'s creation of the [[IsoDidact]].<ref>'''Halo: Silentium''', ''page 20''</ref> Typically, a dead Forerunner's final memories were recovered and stored in a time-locked container known as a [[Durance]].<ref name="c47"/> An abstracted consciousness could also be used as a template for an [[ancilla]]; [[343 Guilty Spark]] was created in this manner.<ref>'''Halo: Primordium''', ''pages 356-357''</ref>

As part of an effort to protect themselves against the [[Flood]], the Forerunners created a machine known as the [[Composer]]. Designed to process Flood victims ''en masse'', the Composer also reduced its targets to ash, denying the Flood access to any biomass. In the original plan, new bodies would be created for the abstracted individuals, now free of infection. However, the Forerunners never mastered the process and the victims' original forms could no longer be restored.<ref>'''Halo: Silentium''', ''page 40''</ref> The Composer was later used by the Didact in an attempt to create an army of [[Promethean]] [[Promethean Knight|war machines]], which led to his imprisonment on [[Requiem]].<ref name="halo 4"/>

[[File:Forerunner weapon.jpg|275px|thumb|right|A group of Forerunner soldiers firing light-based weaponry.]]

The Forerunners used a broad variety of weapons, which mostly encompass several forms of [[directed energy weapon|energy beams]]. These weapons proved to be very effective when battling the Flood, burning Flood forms to the point that they cannot be revived by [[Flood infection form|infection forms]]. Many of these weapons were operated by dedicated automatons, allowing the Forerunners to battle the Flood without risking infection by sending biological beings to the front lines. The Forerunners made active use of [[plasma weaponry]] as well; the Covenant's own weapons and technology are based almost entirely on Forerunner artifacts. As one example of Forerunner weapons technology, certain types of beams could be merged together into one stream to amplify its power; this capability was used on both [[Unidentified Forerunner weapon|infantry weapons]] as well as [[Unidentified Forerunner dreadnought class|starship weaponry]].<ref>'''Halo Legends''': ''Origins''</ref>

In combat, the Forerunners themselves used advanced [[powered exoskeleton|exoskeletons]] called [[combat skin]]s, powerful vehicles such as [[war sphinx]]es, and wielded a formidable arsenal of weaponry. Among these were handheld directed-energy weapons, such as the [[Scattershot]] and [[Lightrifle]]. These weapons utilize various forms of ammunition, including hard light, accelerated beams of ionized particles, antimatter,<ref>'''Halo 4: The Essential Visual Guide''', ''page 101''</ref> or combinations thereof. During the conflict with the Flood, these weapons were designed to disintegrate their targets upon inflicting a critical hit, preventing the Flood from making use of any biological matter. Although they fill relatively basic roles and have clear analogues in human weaponry, many of these weapons also have exotic properties, such as the Scattershot's ricocheting projectiles or the [[Boltshot]]'s secondary burst function. Forerunner firearms, like the rest of their technology, are highly sophisticated; most are composed of disparate parts held together by energy fields and display self-assembling capabilities. Forerunner ground forces also use [[Z-040 Attenuation Field Generator/Localized|pulse grenades]] which generate an energy-drain field before collapsing, decimating any targets within its effective radius.<ref name="halo 4"/>

The many varieties of Forerunner [[sentinel]]s also carry a wide array of weaponry. The [[Aggressor Sentinel]]s use moderately effective [[Sentinel beam|beam weapons]], which can also be wielded by humans and certain Covenant races. Meanwhile, [[Enforcer]]s are equipped with [[Forerunner missile launcher|missile launchers]] and a pair of [[pulse beam]]s, which fire clusters of smaller red Needler-like projectiles or bolts of energy at an incredibly high rate of fire. The [[Constructor]]s' [[Construction beam|repair beam]] can also be considered a weapon, but with minimal damage output. The [[Onyx Sentinel|Sentinels of Onyx]] had significantly more powerful weaponry and shielding. Their energy weapons functioned via a single, slow-charging, extremely powerful golden beam which was effective against energy shields and armor alike.<ref name="GoO">''Halo: Ghosts of Onyx''</ref> The Forerunners also constructed stationary [[Forerunner automated turret|automated turrets]], resembling stripped-down sentinels. [[Monitor]]s are capable of defending themselves with high-powered pulse weapons akin to those used by Sentinels, as well as with gravity manipulation technology.<ref>'''Halo 3''', campaign level ''[[Floodgate]]''</ref><ref>'''Halo 3''', campaign level ''[[Halo (Halo 3 level)|Halo]]''</ref>

[[File:Sacredicon1600.jpg|thumb|right|275px|The [[Library]], a classic example of Forerunner architecture.]]

The Forerunners were also highly skilled at creating stone architecture. Typically, these buildings were built from a pale brown or tan stone.<ref name="ttw"/> These structures were more subject to wear and aging, but their architectural sophistication remains apparent after 100,000 years.<ref>'''Halo 3''', multiplayer map ''[[Sandtrap]]''</ref><ref>'''Halo 2''', campaign level ''[[Delta Halo (level)|Delta Halo]]''</ref> A particularly prominent example of intact Forerunner stone architecture could be found within [[Onyx]]'s [[Zone 67]], which contained a massive Forerunner city constructed entirely of polished [[Onyx (material)|chalcedonic quartz]].<ref>'''Halo: Ghosts of Onyx''', ''page 269''</ref> In some structures, such as the [[Menachite Forerunner complex|Forerunner complex]] beneath [[Reach]]'s [[Menachite Mountain]], patterns and symbols had been embedded in the rock itself by manipulating its mineral inclusions.<ref>'''Halo: First Strike''', ''page 139'' (2003)</ref> Most interestingly, certain Forerunner buildings incorporated "mutable" stonework: [[Temple of the Abiding Truth|a stone Forerunner structure]] in [[Ontom]], [[Sanghelios]] featured passages that could shift and change by literally reshaping the stone from which their walls were built.<ref name="ttw"/>

In addition to physical structures, a large portion of Forerunner architecture is actually composed of sophisticated [[hard light]] construction. Such architecture is often crafted in the likeness of corporeal matter, most commonly gray Forerunner metal. Hard light structures can form complex shapes and in many cases, be entirely indistinguishable from physical construction,<ref>'''Halo: Primordium''', ''pages 116, 201''</ref> making it difficult to determine which structural components are made up of actual matter.<ref name="halo 4"/> This technology has many uses, from acting as basic structural components such as platforms or walls to decorating and furnishing everything from Forerunner homes and public spaces to starship interiors.<ref>'''Halo: Cryptum''', ''page 242''</ref> Many Forerunner structures are capable of materializing when needed and then melting away when deactivated, a feature most likely facilitated through the use of hard light. The immaterial and flexible nature of this technology lends it a great deal of uses, but as a drawback, it is susceptible to power failures;<ref>'''Halo: Primordium''', ''page 50''</ref> nonetheless, certain Forerunner ships, such as the command warship ''[[Mantle's Approach]]'', employ hard light bonding as a means of maintaining the vessel's structural integrity.<ref name="h4evg193"/> Some Forerunner structures, including many of those on [[Requiem]], incorporate components which float in the air without any physical support.<ref name="halo 4"/>

Many symbols and patterns on Forerunner structures employ complex geometric shapes that appear to operate in dimensions higher than human understanding can comprehend.<ref name="GoO"/> The Forerunners also decorated the interiors of their structures with a complex pattern of engraved straight lines and applied decorative touches and designs to nearly everything that they built, from structures to weapons. Even Sentinel drones possess small holographic Forerunner script around their "eyes".<ref name="halo 3">'''Halo 3'''</ref> Some Forerunner structures, most prominently those on Requiem, mark bullet holes and other forms of weapon strike points with a small glyph automatically etched around the damaged portion of the surface within moments of the impact.<ref name="halo 4"/>

[[File:Halo 3 - Installation04B.jpg|thumb|right|300px|The incomplete [[Installation 04B]] over the [[Installation 00|Ark]].]]

In addition to moving and manipulating stars for use in their megastructures, Forerunner [[Miner]]s, specifically stellar-class engineers known colloquially as "[[plasma jockey]]s", experimented with stabilizing young stars.<ref name="c221">'''Halo: Cryptum''', ''page 221''</ref> The Forerunners had also harnessed dozens of stars for energy production by using sophisticated energy fields to direct the energy output of a star.<ref name="c243"/> Specialized plasma jockey installations were also capable of suspending the collapse of a star, although this was rarely entertained due to the enormous amounts of energy required in the process.<ref>'''Halo 4''', multiplayer map ''[[Solace]]'' (map description)</ref> In addition to stellar manipulation, the Forerunners were capable of considerably speeding up a planet's formation, artificially collapsing an [[asteroid]] field into a molten mass, then cooling it down and forming it into a terrestrial planet in less than ten thousand years; a relatively short period of time for the ageless Forerunners.<ref name="c221"/>

===Production notes===

*According to [[Bungie]] employee [[David Candland]],<ref name="blam">[http://forums.bungie.org/halo/archive36.pl?read=1070818 '''halo.bungie.org''': ''Re: Why retcons don't bother me anymore''] (Evil Otto: ''"One of the most striking retcons to me is the basic concept of whole role of humanity. Originally (back in Halo 1) the reason why humans weren't conquered and incorporated into the Covenant collective was because their presence defied Covenant religion. When the Covenant discovered humans, they knew they were forerunners, but their presence implied the "great journey" failed. They also weren't the all powerful gods they worshiped, so the Prophets wanted to "sweep them under the carpet," as it were."'')</ref>, Bungie's intentions for the connection between humanity and Forerunner was that they were one and the same; this was hinted repeatedly throughout the ''Halo'' Trilogy<ref name="blam2">[http://forums.bungie.org/halo/archive36.pl?read=1070818 '''halo.bungie.org''': ''Re: Why retcons don't bother me anymore''] (Evil Otto: ''"The plot lines in our games imply this everywhere - the chief being called reclaimer, only humans being able to retrieve and insert the index, Spark telling the chief, "you are forerunner." etc."'')</ref> and further explored in [[Joe Staten|Staten]]'s novel, ''[[Halo: Contact Harvest]]''. The books of ''[[The Forerunner Saga]]'' released by [[343 Industries]] have since revised this, establishing that the two species were related but distinct and that the actual connection goes far further back than the events in the books, when both species had been created by the Precursors.

**In ''[[Titan]]'', the canceled ''Halo'' MMO, the Forerunners were depicted as humans with dark skin and white hair, similar to the Atlanteans from Disney's ''[[Wikipedia:Atlantis: The Lost Empire|Atlantis: The Lost Empire]]''. This interspecies resemblance is likely based on Bungie's original intention of the Forerunners being ancient humans.<ref>[http://halo.heavengames.com/gallery/view_photo.php?set_albumName=halo_mmo_concept_art&id=Forerunner '''Halo Heaven Gallery''': ''Concept Art - Forerunner'']</ref>

*Bungie environment artist [[Paul Russel]] was largely responsible for establishing the Forerunners' architecture and aesthetic. He cited some of his influences as being sails and movie marquees, as well as the works of American architect [[Wikipedia:Frank Lloyd Wright|Frank Lloyd Wright]];<ref>[https://plus.google.com/photos/114253662089061571624/albums/5500017903460396721/5500019592379269010?banner=pwa ''Paul Russel's image album'']</ref> in particular, Wright's use of cantilevers and stained glass windows with repeating geometric patterns of lines in complementary angles. Russel jokingly stated that ''"I also like the idea of Forerunner columns being sausages meticulously and gorgeously wrapped in bacon by Frank Lloyd Wright's genetic precursor. Now that is a tall tale. Because as far as I know, Forerunner architecture is inedible—unless the fans say otherwise."''<ref>'''[[Halo: The Great Journey: The Art of Building Worlds]]''', ''page 28''</ref>

===Miscellaneous===

*The Forerunners show some similarities (their highly advanced technology and the fact that they mysteriously vanished) to the [[w:c:marathongame:Jjaro|Jjaro]], a race of aliens from a previous [[Bungie]] game, ''[[Marathon]]''. The concept of a highly advanced extinct race leaving technological relics behind is not a new concept and is indeed a fairly common element of science fiction of all media, from books, to films.

*The Forerunners were the main focus of the alternate reality game, ''[[Iris]]''.

*''[[The Forerunner Saga]]'', a trilogy of books based on the Forerunners' culture and their war with the Flood was written by [[Greg Bear]]. The first of these books was released on January 4th, 2011, titled ''[[Halo: Cryptum]]'', while the second novel, ''[[Halo: Primordium]]'', was released on [[2012|January 3, 2012]]. The third book, ''[[Halo: Silentium]]'', was released on March 19th 2013.<ref>[http://halo.xbox.com/blogs/Headlines/post/2012/07/11/Tor-Books-Reveals-Title-Cover-Art-And-Release-Date-of-Third-Halo-Novel-By-Greg-Bear.aspx '''Tor Books reveals title, cover art, and release date of the third Halo novel by legendary science fiction author Greg Bear''']</ref> <ref>[http://blogs.halowaypoint.com/Headlines/post/2012/10/22/Tor-Books-Updates-Release-Date-of-the-Third-Halo-Novel-by-Legendary-Science-Fiction-Author-Greg-Bear.aspx '''TOR BOOKS UPDATES RELEASE DATE OF THE THIRD HALO NOVEL BY LEGENDARY SCIENCE FICTION AUTHOR GREG BEAR''']</ref>

File:H4 - Lifeworkers.jpg|Two Forerunner Lifeworkers.

File:ForeunnerCGI.jpg|A Forerunner facing a [[Monitor]].

File:Forerunner origins.jpg|A Forerunner Combat Skin, as seen in ''[[Origins]]''.

File:Forerunner main.png|A group of Forerunner military leaders within the [[Control Room]] of a [[Halo Array|Halo Installation]].

File:04B Control Room.png|Installation 04B's [[control room]].

File:TSC01.png|A hologram of the [[Silent Cartographer]] facility on [[Installation 04]].

*''[[Halo: The Fall of Reach]]'' {{First mentioned}} {{C|Technology only}}

**''[[Terminal/Halo 3|Terminals]]'' {{1st}}

*''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''

**''[[Terminal/Halo: Combat Evolved Anniversary|Terminals]]''

**''[[Terminal/Halo 4|Terminals]]''

*''[[Halo: Rebirth]]''

*''[[Halo 2 Anniversary]]'' {{C|Technology only}}

*''[[Halo Online]]'' {{C|Technology only}}

<references group="note"/>

{{Reflist|2}}