Flood: Difference between revisions

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The Forerunners employed countless measures to contain the Flood outbreak, all of which failed. Finally, the Forerunners were forced to a Pyrrhic solution: using an array of seven ring-shaped megastructures collectively known as the [[Halo Array]] as superweapons, the Forerunners would purge the galaxy of all sentient life. Because the Flood were parasitic, and their survival was directly linked to the presence of potential hosts (and in particular hosts capable of sentience) the Forerunners reasoned that eliminating all potential Flood hosts would render the parasite unable to grow and spread, and eventually cause it to starve to death. Additionally, as a result of the Master Builder's test of [[Installation 07|a Halo]] at [[Charum Hakkor]], it was found that the Halo Effect unintentionally caused the complete destruction of artefacts of Neural Physics. This was likely a byproduct of how the Halo Effect was designed to destroy any and all forms of neurological structure subjected to it.{{Ref/Novel|Id=cryptum 293|Cry|Page=293-294}} The decision led to political battles and even a civil war, but after exhausting every countermeasure, the Forerunners activated the Halos in [[97,445 BCE]].
The Forerunners employed countless measures to contain the Flood outbreak, all of which failed. Finally, the Forerunners were forced to a Pyrrhic solution: using an array of seven ring-shaped megastructures collectively known as the [[Halo Array]] as superweapons, the Forerunners would purge the galaxy of all sentient life. Because the Flood were parasitic, and their survival was directly linked to the presence of potential hosts (and in particular hosts capable of sentience) the Forerunners reasoned that eliminating all potential Flood hosts would render the parasite unable to grow and spread, and eventually cause it to starve to death. Additionally, as a result of the Master Builder's test of [[Installation 07|a Halo]] at [[Charum Hakkor]], it was found that the Halo Effect unintentionally caused the complete destruction of artefacts of Neural Physics. This was likely a byproduct of how the Halo Effect was designed to destroy any and all forms of neurological structure subjected to it.{{Ref/Novel|Id=cryptum 293|Cry|Page=293-294}} The decision led to political battles and even a civil war, but after exhausting every countermeasure, the Forerunners activated the Halos in [[97,445 BCE]].


As a result of the firing of the seven Halo installations, the surviving Flood were successfully contained and eventually died out. The only surviving specimens were contained in state-of-the-art, high-security Forerunner research facilities, such as the Halo installations, certain Shield Worlds, and the [[Threshold gas mine]]. All Precursor artifacts and structures, composed and maintained entirely using Neural Physics were also destroyed and left no trace.{{Ref/Novel|Sil|Page=326}} Many sentient species throughout the galaxy (including humanity) survived the firing of the Halo Array, having been safely relocated beyond the galaxy by the Forerunners on [[Installation 00|the Ark]]. During their expansion throughout the Orion Arm, the [[Covenant]] would find and occasionally release the Flood, employing [[Zealot]]s and their [[Temple Wraith]]s to contain the outbreaks.{{Ref/Game|H5|Detail=[[Temple Wraith]] REQ card description}}
As a result of the firing of the seven Halo installations, the surviving Flood were successfully contained and eventually died out. The only surviving specimens were contained in state-of-the-art, high-security Forerunner research facilities, such as the Halo installations, certain Shield Worlds, and the [[Threshold gas mine]]. All Precursor artifacts and structures, composed and maintained entirely using Neural Physics were also destroyed and left no trace.{{Ref/Novel|Sil|Page=326}} Many sentient species throughout the galaxy (including humanity) survived the firing of the Halo Array, having been safely relocated beyond the galaxy by the Forerunners on [[Installation 00|the Ark]].  
 
During their expansion throughout the Orion Arm, the [[Covenant]] would find and occasionally release the Flood, employing [[Zealot]]s and their [[Temple Wraith]]s to contain the outbreaks.{{Ref/Game|H5|List of REQ cards|REQ card|Detail=[[Temple Wraith]] description}}{{Ref/Book|Enc22|Page=224}}


===Outbreak on the Etran Harborage===
===Outbreak on the Etran Harborage===
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With the Proto-Gravemind dead, the smart-[[AI]] [[Serina]] was able to reacquire Anders' actual signal, which led to an ocean under which a docking port leading to the interior shield world was located. During the ''Spirit of Fire's'' descent, the outer surface of the ship was infested by the Flood. With the aid of Sentinels and "cleansing rings" controlled by the installation's AI, the ''Spirit of Fire'' crew were able to cleanse the ship and proceed into the shield world.
With the Proto-Gravemind dead, the smart-[[AI]] [[Serina]] was able to reacquire Anders' actual signal, which led to an ocean under which a docking port leading to the interior shield world was located. During the ''Spirit of Fire's'' descent, the outer surface of the ship was infested by the Flood. With the aid of Sentinels and "cleansing rings" controlled by the installation's AI, the ''Spirit of Fire'' crew were able to cleanse the ship and proceed into the shield world.


Within, the UNSC forces discovered that the Flood had managed to infest the interior of the shield world as well, though not to as massive of a degree as the surface planet itself. While rescuing Anders, Forge had to save her from three [[Flood infection form]]s and ran into some trouble with Flood forces on his following missions, though not to the massive extent they had been seen on the exterior planet.
Within, the UNSC forces discovered that the Flood had managed to infest the interior of the shield world as well, though not to as massive of a degree as the surface planet itself. While rescuing Anders, Forge had to save her from three [[pod infector]]s and ran into some trouble with Flood forces on his following missions, though not to the massive extent they had been seen on the exterior planet.


In order to prevent the Covenant from getting their hands on Etran Harborage's fleet of Forerunner {{Class|Sojourner|dreadnought}}s, a plan was created to use the reactor from the ''Spirit of Fire's'' [[Shaw-Fujikawa Translight Engine]] to induce the shield world's artificial star to go [[supernova]]. The plan was a success and Etran Harborage was destroyed. The explosion obliterated the Flood on the planet, along with the Covenant forces and the Forerunner fleet.{{Ref/Game|HW}}
In order to prevent the Covenant from getting their hands on Etran Harborage's fleet of Forerunner {{Class|Sojourner|dreadnought}}s, a plan was created to use the reactor from the ''Spirit of Fire's'' [[Shaw-Fujikawa Translight Engine]] to induce the shield world's artificial star to go [[supernova]]. The plan was a success and Etran Harborage was destroyed. The explosion obliterated the Flood on the planet, along with the Covenant forces and the Forerunner fleet.{{Ref/Game|HW}}


====Brief Recurrence====
====Brief recurrence====
{{main|Outbreak on the UNSC Spirit of Fire}}
{{main|Outbreak on the UNSC Spirit of Fire}}
On January 1, [[2537]], six years after the events on [[Trove]], a Flood outbreak was initiated aboard the {{UNSCShip|Spirit of Fire}} by a [[Pod infector]] that had managed to remain hidden aboard the ship. As the Flood threatened to breach quarantine, Serina awoke [[Jerome-092]] who, with the aid of Professor [[Ellen Anders]], was forced to exterminate all infected crew members, ensuring the survival of the ''Spirit of Fire'' and its remaining crew. All traces of the Flood parasite aboard the ''Spirit of Fire'' were erased.{{Ref/Comic|TFS|Detail=''[[Something Has Happened]]''}}
On January 1, [[2537]], six years after the events on [[Trove]], a Flood outbreak was initiated aboard the {{UNSCShip|Spirit of Fire}} by a [[Pod infector]] that had managed to remain hidden aboard the ship. As the Flood threatened to breach quarantine, Serina awoke [[Jerome-092]] who, with the aid of Professor [[Ellen Anders]], was forced to exterminate all infected crew members, ensuring the survival of the ''Spirit of Fire'' and its remaining crew. All traces of the Flood parasite aboard the ''Spirit of Fire'' were erased.{{Ref/Comic|TFS|Detail=''[[Something Has Happened]]''}}
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{{Main|Battle of Installation 04|Outbreak at the Containment Facility}}
{{Main|Battle of Installation 04|Outbreak at the Containment Facility}}
[[File:Anniversary, flood outbreak.jpg|thumb|300px|[[Jacob Keyes]] and his Marine squad are overwhelmed by the Flood during their expedition into a [[Flood containment facility]].]]
[[File:Anniversary, flood outbreak.jpg|thumb|300px|[[Jacob Keyes]] and his Marine squad are overwhelmed by the Flood during their expedition into a [[Flood containment facility]].]]
{{Quote|The only way to stop the Flood is to starve them to death.|[[Cortana]] to [[John 117]] and [[343 Guilty Spark]].}}
{{Quote|The only way to stop the Flood is to starve them to death.|[[Cortana]] to [[John-117]] and [[343 Guilty Spark]].}}


Although the first firing of the Halo Array starved the Flood that were at large in the Milky Way Galaxy, Flood specimens were kept in stasis within installations around the galaxy, including [[Installation 04]] and various Forerunner research facilities. This would prove to be a grave mistake, as both humanity and the Covenant stumbled upon  [[Installation 04|one]] of the abandoned Halo rings thousands of years after the firing of the Array. The UNSC [[Artificial intelligence|AI]] [[Cortana]], aboard the {{UNSCShip|Pillar of Autumn}}, made what was presumed to be a "blind" jump through Slipspace (in reality, she used translated co-ordinates from a [[Sigma Octanus IV artifact|Forerunner artifact]] found on [[Sigma Octanus IV]]) to evade Covenant pursuers. This led both groups to Installation 04, and in turn, the Flood that were kept there in stasis. After the crash of the ''Pillar of Autumn'' on the Halo ring, piloted by [[Captain (Navy)|Captain]] [[Jacob Keyes]], the surviving crewmembers dug in for what they believed would be a long and brutal guerrilla campaign against the Covenant forces on the ring.
Although the first firing of the Halo Array starved the Flood that were at large in the Milky Way Galaxy, Flood specimens were kept in stasis within installations around the galaxy, including [[Installation 04]] and various Forerunner research facilities. This would prove to be a grave mistake, as both humanity and the Covenant stumbled upon  [[Installation 04|one]] of the abandoned Halo rings thousands of years after the firing of the Array. The UNSC [[Artificial intelligence|AI]] [[Cortana]], aboard the {{UNSCShip|Pillar of Autumn}}, made what was presumed to be a "blind" jump through Slipspace (in reality, she used translated co-ordinates from a [[Sigma Octanus IV artifact|Forerunner artifact]] found on [[Sigma Octanus IV]]) to evade Covenant pursuers. This led both groups to Installation 04, and in turn, the Flood that were kept there in stasis. After the crash of the ''Pillar of Autumn'' on the Halo ring, piloted by [[Captain (Navy)|Captain]] [[Jacob Keyes]], the surviving crewmembers dug in for what they believed would be a long and brutal guerrilla campaign against the Covenant forces on the ring.
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===Earth, the Ark, and the Flood's defeat===
===Earth, the Ark, and the Flood's defeat===
[[File:Infection.jpg|230px|thumb|right|A UNSC Marine being infected by the Flood.]]
[[File:Infection.jpg|230px|thumb|A UNSC Marine being infected by the Flood.]]
{{main|Outbreak on Earth|Battle of Installation 00}}
{{main|Outbreak on Earth|Battle of Installation 00}}


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Even though the Gravemind was destroyed, and all Flood on the Ark apparently eradicated, the Flood still existed on the other Halo rings (excluding Installation 05 which was sterilized by Sangheili forces) and other remaining Forerunner installations. Even though [[Path Kethona]] was sterilized by [[Omega Halo]] near the end of the Flood war, given the Flood's extragalactic origin, it was possible that more pockets of Flood existed outside of the galaxy - or more disturbingly, that other, more distant galaxies may have fallen to the Flood.
Even though the Gravemind was destroyed, and all Flood on the Ark apparently eradicated, the Flood still existed on the other Halo rings (excluding Installation 05 which was sterilized by Sangheili forces) and other remaining Forerunner installations. Even though [[Path Kethona]] was sterilized by [[Omega Halo]] near the end of the Flood war, given the Flood's extragalactic origin, it was possible that more pockets of Flood existed outside of the galaxy - or more disturbingly, that other, more distant galaxies may have fallen to the Flood.


Though the UNSC kept the Flood's existence concealed from the general population, it did make preparations for the possibility of the Flood's return. The new [[Spartan Operations|Spartan]] branch was designed as a first line of defense against the Flood, with the [[SPARTAN-IV program|SPARTAN-IV]] complement of the {{UNSCShip|Infinity}} running simulations depicting the possible return of the Flood. This is realized through both [[War Games]] [[Flood (gametype)|exercises]] and the interactive [[UNSC Tactical Simulator|TACSIM]].{{Ref/Game|Id=HSA|SA|Detail=[[Halo: Spartan Assault co-op missions|Flood missions]]}} Some Spartans volunteered to join [[Flood containment Fireteams]] dedicated to going up against Flood outbreaks, with several outbreaks occurring following the end of the war and being successfully contained due to their actions.{{Ref/Reuse|OSFM}} Teams were deployed to quarantine any areas of potential Flood contamination during the UNSC's initial forays onto Halo [[Installation 03]],{{Ref/Book|H4EVG|Page=200}} though it is unclear whether the parasite was actually encountered. The UNSC has otherwise seen the development of the [[Hazops Cyclops]] dedicated to fighting the Flood threat, and the "Flood" variant of the [[Visual Intelligence System, Reconnaissance|VISR]] - given to Spartan personnel involved in Flood containment duties.{{Ref/Game|H5|Detail=Flood visor description}} The UNSC includes a briefing on the Flood in the [[Halo: Official Spartan Field Manual|Spartan Field Manual]], wherein it details protocols such as [[Emergency Contact Protocol Upsilon]] and the [[CORRUPTER]] cryptonym - to be declared in the suspected presence of a Flood outbreak and upon infection of a Spartan, respectively.{{Ref/Reuse|OSFM}}
Though the UNSC kept the Flood's existence concealed from the general population, it did make preparations for the possibility of the Flood's return. The new [[Spartan Operations|Spartan]] branch was designed as a first line of defense against the Flood, with the [[SPARTAN-IV program|SPARTAN-IV]] complement of the {{UNSCShip|Infinity}} running simulations depicting the possible return of the Flood. This is realized through both [[War Games]] [[Flood (gametype)|exercises]] and the interactive [[UNSC Tactical Simulator|TACSIM]].{{Ref/Game|Id=HSA|SA|Detail=[[Halo: Spartan Assault co-op missions|Flood missions]]}} Some Spartans volunteered to join [[Flood containment Fireteam]]s dedicated to going up against Flood outbreaks, with several outbreaks occurring following the end of the war and being successfully contained due to their actions.{{Ref/Reuse|OSFM}} Teams were deployed to quarantine any areas of potential Flood contamination during the UNSC's initial forays onto Halo [[Installation 03]],{{Ref/Book|H4EVG|Page=200}} though it is unclear whether the parasite was actually encountered. The UNSC has otherwise seen the development of the [[Hazops Cyclops]] dedicated to fighting the Flood threat, and the "Flood" variant of the [[Visual Intelligence System, Reconnaissance|VISR]] - given to Spartan personnel involved in Flood containment duties.{{Ref/Game|H5|Detail=Flood visor description}} The UNSC includes a briefing on the Flood in the [[Halo: Official Spartan Field Manual|Spartan Field Manual]], wherein it details protocols such as [[Emergency Contact Protocol Upsilon]] and the [[CORRUPTER]] cryptonym - to be declared in the suspected presence of a Flood outbreak and upon infection of a Spartan, respectively.{{Ref/Reuse|OSFM}}


Three days after the [[Battle of Installation 00]], with some Flood spores having survived the [[Raid on Installation 08|firing]] of [[Installation 08]] and the destruction of High Charity's reactor, [[Installation 00|the Ark's]] [[monitor]] [[000 Tragic Solitude]] had the ruined Covenant capital city of [[High Charity]] sealed off with a [[containment shield]] and the Ark's [[Sentinel]]s raze the perimeter and modify the refugia nearby so that no sentient life would survive in the vicinity, thus depriving the Flood of new host bodies were they ever to escape. Tragic Solitude also set a battalion of Sentinels on patrol around the perimeter, not only to keep the Flood contained, but to defend against any future outsiders who might try to enter the wreckage and thus unleash the Flood.{{Ref/Game|HW2|Detail=''Phoenix Logs'' - ''Idle Hands II''}}
Three days after the [[Battle of Installation 00]], with some Flood spores having survived the [[Raid on Installation 08|firing]] of [[Installation 08]] and the destruction of High Charity's reactor, [[Installation 00|the Ark's]] [[monitor]] [[000 Tragic Solitude]] had the ruined Covenant capital city of [[High Charity]] sealed off with a [[containment shield]] and the Ark's [[Sentinel]]s raze the perimeter and modify the refugia nearby so that no sentient life would survive in the vicinity, thus depriving the Flood of new host bodies were they ever to escape. Tragic Solitude also set a battalion of Sentinels on patrol around the perimeter, not only to keep the Flood contained, but to defend against any future outsiders who might try to enter the wreckage and thus unleash the Flood.{{Ref/Game|HW2|Detail=''Phoenix Logs'' - ''Idle Hands II''}}
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===Nightmare on the Ark===
===Nightmare on the Ark===
{{Quote|I told you NOT to go inside. FOR GOOD REASON!|[[Atriox]] to [[Voridus]]{{Ref/Level|Id=Manifestation|[[Halo Wars 2: Awakening the Nightmare]]|[[Manifestation]]}}}}
{{Quote|I told you NOT to go inside. FOR GOOD REASON!|[[Atriox]] to [[Voridus]]{{Ref/Level|Id=Manifestation|[[Halo Wars 2: Awakening the Nightmare]]|[[Manifestation]]}}}}
[[File:HW2 FloodTankForm Concept.jpg|right|thumb|250px|A [[Flood tank form]] overwhelms a Warthog.]]
[[File:HW2 FloodTankForm Concept.jpg|thumb|250px|A [[Flood tank form]] overwhelms a Warthog.]]
{{Main|Outbreak on Installation 00}}
{{Main|Outbreak on Installation 00}}
In early [[2559#June|June 2559]], after the loss of the ''[[Enduring Conviction]]'', the [[Jiralhanae]] brothers [[Pavium]] and [[Voridus]] were tasked to salvage the wrecks around [[High Charity]] for weapons to use in [[Second Ark Conflict|the conflict]] with the humans of the {{UNSCShip|Spirit of Fire}}. The [[Banished]] leader Atriox, aware of the potential danger of the Flood having survived in the city, gave specific orders to only scout the shell and not to go inside lest surviving Flood be disturbed. However, [[Voridus]], like many of the Banished, did not take the threat of the Flood seriously, believing it simply be another lie of the [[San'Shyuum|Prophets]]. Ignoring the warnings of both Atriox and his own brother Pavium, Voridus deactivated the Ark's Sentinel defense network and used a [[Barukaza Workshop Scarab]] to burn a hole in the [[containment shield]] around the former Covenant holy city. When Voridus' troops entered the wreckage to salvage it, they were ambushed by thousands of Flood [[infection form]]s lurking within High Charity which were then set loose upon the Ark. With the Sentinel defense network down, the Flood were left unhindered by the Ark's defense systems.{{Ref/Level|Id=What Could Go Wrong?|[[Halo Wars 2: Awakening the Nightmare]]|[[What Could Go Wrong?]]}}
In early [[2559#June|June 2559]], after the loss of the ''[[Enduring Conviction]]'', the [[Jiralhanae]] brothers [[Pavium]] and [[Voridus]] were tasked to salvage the wrecks around [[High Charity]] for weapons to use in [[Second Ark Conflict|the conflict]] with the humans of the {{UNSCShip|Spirit of Fire}}. The [[Banished]] leader Atriox, aware of the potential danger of the Flood having survived in the city, gave specific orders to only scout the shell and not to go inside lest surviving Flood be disturbed. However, [[Voridus]], like many of the Banished, did not take the threat of the Flood seriously, believing it simply be another lie of the [[San'Shyuum|Prophets]]. Ignoring the warnings of both Atriox and his own brother Pavium, Voridus deactivated the Ark's Sentinel defense network and used a [[Barukaza Workshop Scarab]] to burn a hole in the [[containment shield]] around the former Covenant holy city. When Voridus' troops entered the wreckage to salvage it, they were ambushed by thousands of Flood [[infection form]]s lurking within High Charity which were then set loose upon the Ark. With the Sentinel defense network down, the Flood were left unhindered by the Ark's defense systems.{{Ref/Level|Id=What Could Go Wrong?|[[Halo Wars 2: Awakening the Nightmare]]|[[What Could Go Wrong?]]}}
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======Tadpoles======
======Tadpoles======
[[File:H2A Tadpole2.png|right|thumb|A Flood tadpole in a tank.]]
[[File:H2A Tadpole2.png|thumb|A Flood tadpole in a tank.]]
{{Main|Flood tadpole}}
{{Main|Flood tadpole}}
Pod infectors undergo a tadpole phase of development before growing into full physical maturity.<ref name="onefinaleffort">[http://halo.bungie.net/news/content.aspx?type=topnews&cid=25650 ''Bungie.net'': ''One Final Effort (4/16/2010)'']</ref>
Pod infectors undergo a tadpole phase of development before growing into full physical maturity.<ref name="onefinaleffort">[http://halo.bungie.net/news/content.aspx?type=topnews&cid=25650 ''Bungie.net'': ''One Final Effort (4/16/2010)'']</ref>
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======Seeder infectors======
======Seeder infectors======
[[File:HW2-SeederInfectors.png|right|thumb|A Seeder infector.]]
[[File:HW2-SeederInfectors.png|thumb|A Seeder infector.]]
{{Main|Seeder infector}}
{{Main|Seeder infector}}
These are airborne forms of Pod infectors that mainly tasked with infecting airborne creatures.
These are airborne forms of Pod infectors that mainly tasked with infecting airborne creatures.
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======Infester Forms======
======Infester Forms======
[[File:HW2-Infestor.png|thumb|right|An Infester form.]]
[[File:HW2-Infestor.png|thumb|An Infester form.]]
{{Main|Flood infester form}}
{{Main|Flood infester form}}
These forms attack and infect vehicles.
These forms attack and infect vehicles.
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======Spawner Forms======
======Spawner Forms======
[[File:HW2-Spawner.png|right|thumb|A Flood Spawner.]]
[[File:HW2-Spawner.png|thumb|A Flood Spawner.]]
{{Main|Flood spawner form}}
{{Main|Flood spawner form}}
These forms can produce a variety of Flood forms on the move.
These forms can produce a variety of Flood forms on the move.


======Flood burster======
======Flood burster======
[[File:HW2-Burster.png|thumb|right|A Flood Burster.]]
[[File:HW2-Burster.png|thumb|A Flood Burster.]]
{{Main|Flood burster}}
{{Main|Flood burster}}
These forms can produce a variety of Flood forms and release them once its internal pressure has reached a certain point.
These forms can produce a variety of Flood forms and release them once its internal pressure has reached a certain point.
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======Abomination======
======Abomination======
[[File:HW2-Abomination Render.jpg|right|thumb|An Abomination.]]
[[File:HW2-Abomination Render.jpg|thumb|An Abomination.]]
{{Main|Abomination}}
{{Main|Abomination}}
The Abomination is a mobile, low-level key mind form capable of combat that coordinates the Flood on a local scale.
The Abomination is a mobile, low-level key mind form capable of combat that coordinates the Flood on a local scale.
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======Gravemind======
======Gravemind======
[[File:HTMCC-H2A AMonumentToAllYourSins.png|thumb|A Gravemind.]]
{{Main|Gravemind}}
{{Main|Gravemind}}
This ultimate Flood form serves as the coordinating hive mind of the Flood. While they vary in size and complexity, at their height Graveminds can engulf entire worlds.
This ultimate Flood form serves as the coordinating hive mind of the Flood. While they vary in size and complexity, at their height Graveminds can engulf entire worlds.


==Biology==
==Biology==
[[File:Flood wall.jpg|thumb|right||150px|A wall covered in heavy Flood biomass: evidence of advanced infestation.]]
[[File:Flood wall.jpg|thumb||150px|A wall covered in heavy Flood biomass: evidence of advanced infestation.]]
[[File:H2A Render FloodSpore.png|thumb|150px|A Flood spore.]]
[[File:H2A Render FloodSpore.png|thumb|150px|A Flood spore.]]


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The Flood collectively learn any information contained within the minds of their sentient hosts. For example, during the ill-fated raid on the ''[[Infinite Succor]]'', after even one Sangheili was assimilated, all the Flood could open any doors and access any system on the ship immediately afterward, demonstrating the Flood's ability to share collective knowledge across their species. Furthermore, when the Flood assimilated the Prophet legate, the [[Minister of Etiology]], the Flood reflected the high-level knowledge of the Legate through its individual organisms to Special Operations Commander Rtas 'Vadumee, mocking him with the words, "''the Forerunner could not defeat us...what chance you?''". The Flood, however, reflect unusual knowledge in the individual psychologies of its individual species in processes facilitating increased infestation: The Flood were sighted gathering bodies in the corners of the Covenant ship ''Truth and Reconciliation'', perhaps making it easier for infection forms to find hosts to reanimate. The Flood were also gathering body parts for a new proto-Gravemind aboard the ''Infinite Succor''.
The Flood collectively learn any information contained within the minds of their sentient hosts. For example, during the ill-fated raid on the ''[[Infinite Succor]]'', after even one Sangheili was assimilated, all the Flood could open any doors and access any system on the ship immediately afterward, demonstrating the Flood's ability to share collective knowledge across their species. Furthermore, when the Flood assimilated the Prophet legate, the [[Minister of Etiology]], the Flood reflected the high-level knowledge of the Legate through its individual organisms to Special Operations Commander Rtas 'Vadumee, mocking him with the words, "''the Forerunner could not defeat us...what chance you?''". The Flood, however, reflect unusual knowledge in the individual psychologies of its individual species in processes facilitating increased infestation: The Flood were sighted gathering bodies in the corners of the Covenant ship ''Truth and Reconciliation'', perhaps making it easier for infection forms to find hosts to reanimate. The Flood were also gathering body parts for a new proto-Gravemind aboard the ''Infinite Succor''.


Flood combat forms have been sighted crudely operating {{Patterm|Karo'etba|Ghost}}s, [[M12 Warthog|Warthog]]s, [[Zurdo-pattern Wraith|Wraiths]], and [[Scorpion]]s in ground operations, although with slow deliberation and clumsy driving and accuracy. The assimilated crewmen of the [[UNSC frigate]] ''[[UNSC In Amber Clad|In Amber Clad]]'' were also able to initiate a [[Slipspace]] micro-jump for the frigate and perform rudimentary maneuvering of the ''In Amber Clad'', navigating the frigate from the atmosphere of [[Installation 05|Delta Halo]] to ''High Charity'' and then crashing the vessel into a tower, releasing Pelican dropships to rain down upon the Covenant capital.
Flood combat forms have been sighted crudely operating {{Pattern|Karo'etba|Ghost}}s, [[M12 Warthog|Warthog]]s, [[Zurdo-pattern Wraith|Wraiths]], and [[Scorpion]]s in ground operations, although with slow deliberation and clumsy driving and accuracy. The assimilated crewmen of the [[UNSC frigate]] ''[[UNSC In Amber Clad|In Amber Clad]]'' were also able to initiate a [[Slipspace]] micro-jump for the frigate and perform rudimentary maneuvering of the ''In Amber Clad'', navigating the frigate from the atmosphere of [[Installation 05|Delta Halo]] to ''High Charity'' and then crashing the vessel into a tower, releasing Pelican dropships to rain down upon the Covenant capital.


While one of the Flood's main strengths lies in the decentralization of its compound mind and ability to be reborn from even the most carefully reduced remnant, it is nonetheless known to develop and assume a certain "core" Gravemind as an embodiment for its strategic intelligence. The Forerunners observed that the Flood exhibits a seemingly instinctive tendency to recoil and concentrate all of its otherwise distributed assets around this core when threatened on a large scale. A threat to the Flood's existence major enough to prompt such action was the imminent firing of the Halos, at which point the Flood gathered all of its available assets and launched an attack on the Ark.{{Ref/Game|H3|Detail=[[Terminal (Halo 3)|Terminal 3]]}}
While one of the Flood's main strengths lies in the decentralization of its compound mind and ability to be reborn from even the most carefully reduced remnant, it is nonetheless known to develop and assume a certain "core" Gravemind as an embodiment for its strategic intelligence. The Forerunners observed that the Flood exhibits a seemingly instinctive tendency to recoil and concentrate all of its otherwise distributed assets around this core when threatened on a large scale. A threat to the Flood's existence major enough to prompt such action was the imminent firing of the Halos, at which point the Flood gathered all of its available assets and launched an attack on the Ark.{{Ref/Game|H3|Detail=[[Terminal (Halo 3)|Terminal 3]]}}


The Flood is very effective on a psychological level, as its parasitic nature and gruesome appearance alone are a source of horror for most of its enemies and thus serve as powerful demoralizers. It is not uncommon for survivors of Flood encounters to be severely traumatized, often to the point of delirium, after witnessing their comrades get infected or being subsequently forced to kill said infected individuals.{{Ref/Level|CE|[[343 Guilty Spark (level)|343 Guilty Spark]]|Detail=[[Paranoid Marine]])}}{{Ref/Level|H3|[[Floodgate]]|Detail=[[Suicidal Marine]]}}
The Flood is very effective on a psychological level, as its parasitic nature and gruesome appearance alone are a source of horror for most of its enemies and thus serve as powerful demoralizers. It is not uncommon for survivors of Flood encounters to be severely traumatized, often to the point of delirium, after witnessing their comrades get infected or being subsequently forced to kill said infected individuals.{{Ref/Level|CE|[[343 Guilty Spark (level)|343 Guilty Spark]]|Detail=[[Paranoid Marine]]}}{{Ref/Level|H3|[[Floodgate]]|Detail=[[Suicidal Marine]]}}
{{Clear}}
{{Clear}}


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*[[Gersten]]
*[[Gersten]]
*[[Orlav]]
*[[Orlav]]
*[[Prophet of Mercy]]
{{col-2}}
{{col-2}}
*[[Prophet of Mercy]]
*[[Prophet of Regret]]
*[[Prophet of Regret]]
*[[Prophet of Truth]]
*[[Prophet of Truth]]
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*[[Mendicant Bias]]
*[[Mendicant Bias]]
*[[2401 Penitent Tangent]]
*[[2401 Penitent Tangent]]
*At least one Spartan from [[Fireteam Leviathan]]
{{col-end}}
{{col-end}}
==Non-canon and dubious canon appearances==
===Silver Timeline===
{{Notice/Silver}}
{{Quote|no=two|q1=What is it?|Kwan Ha|q2=It is the cohesion. The meaning. The final equilibrium. This is the end. This is the Flood.|The Mother|The Mother reveals the monster's true identity.{{Ref/Reuse|TVHalo}}}}
[[The Mother]] repeatedly warns [[Kwan Ha]] of a "monster" that is approaching in visions.{{Ref/Film|TV|Episode=[[Aleria (TV Series)|Aleria]]}}{{Ref/Film|TV|Episode=[[Onyx (TV Series)|Onyx]]}}
After accessing a Forerunner site on [[Onyx/Silver|Onyx]], Kwan, Dr. [[Catherine Halsey/Silver|Halsey]], and [[Miranda Keyes/Silver|Miranda Keyes]] are shown a [[star map]] documenting the Flood's spread, causing Kwan to realize that the monster is real.{{Ref/Film|TV|Episode=[[Thermopylae (TV Series)|Thermopylae]]}}
An overeager biologist named [[Janine Caryyew]] inadvertently releases Flood spores from within a sample container collected by Kwan, Halsey and Miranda, unleashing the Flood throughout the Onyx base. The Flood quickly consumes and converts most of the base's personnel, including [[Admiral]] [[Margaret Parangosky/Silver|Margaret Parangosky]]. While Halsey is infected, Miranda places her mother into stasis in the hopes of finding a cure. Kwan, [[Soren-066/Silver|Soren]], [[Kessler]] and [[James Ackerson/Silver|Ackerson]] manage to escape thanks to the intervention of the Mother who warns Kwan of the true nature of the Flood, but [[Laera]] remains behind after getting infected.{{Ref/Film|Id=TVHalo|TV|Episode=[[Halo (TV Series)|Halo]]}}
==Gameplay==
{{Main|The Flood/Gameplay}}
===Changes from Halo: ''Combat Evolved'' to ''Halo 2''===
*In addition to making low growls, the Flood make screeches and roars, which were not present in the first game.
*Their skin is more textured due to the improved graphics engine, giving the Flood a more realistic and necrotic look. The faces of the human forms are also more readily recognizable.
*If a combat form has both arms shot off, it will walk slowly then explode, releasing the Pod infector that was controlling it. This eliminated the Flood Buddy glitch.
*Rather than having to "gather bodies," the Flood can seemingly infect hosts over the course of a few minutes or even a few seconds, once again possibly due to the presence of the Gravemind, eliminating the need to gather bodies to form one.
*Rather than corpses reanimating themselves, a Pod infector will enter the body, then reanimate it, even if the form was just eliminated.
*If the player is attacked by a Pod infector while their shields are down, the character will die instantly. In ''Halo: Combat Evolved'', it would simply take a bar of health away.
*Some combat forms derived from Elites still have functional energy shields. However, they never possess active camouflage, as some in ''Halo: Combat Evolved's'' [[The Maw |final level]] did.
*Flood combat forms can use vehicles, albeit clumsily, and are also able to board the player's vehicle; they will then proceed to melee the player character and pull them from the vehicle.
*Melee attacks do little to no damage against the Flood in ''[[Halo: Combat Evolved]]''. They deal a bit more damage in ''[[Halo 2]]''.
*The Flood prefer to stay back and fire on the player rather than rush him. This could be because of the presence of the Gravemind, though, from a gameplay perspective, it is due to improved artificial intelligence.
*In ''Halo: Combat Evolved'' a combat form would walk slowly when shooting at the player. When losing the arm that shoots, it would charge the player character. In ''Halo 2'', combat forms either use a melee attack or shoot at the player in these situations.
*If a player is wielding an energy sword or shotgun, a combat form may retreat. They will not do this if a player is wielding other weapons.
*Unlike in ''Halo: Combat Evolved'', shooting one Pod infector will not result in the rest of the swarm exploding with it. However, Pod infectors are encountered in proportionally smaller numbers in comparison to ''Halo: Combat Evolved''.
*Pod infectors appear noticeably less textured and detailed than in ''Halo: Combat Evolved''.
*Flood Combat Forms do not "feign death" anymore.
*Splattering become more difficult as the Flood can use the vehicle momentum to hijack the vehicle.
===Changes from ''Halo 2'' to ''Halo 3''===
*Brutes may now be infected and transformed into combat forms.
*Melee attacks and plasma weapons were nearly useless against the Flood in ''Halo: Combat Evolved'' and ''Halo 2'', but now can be used effectively against the Flood. The Flood are much more vulnerable to ballistic weapons, as well.
*Pod infectors can mutate humans, unshielded Elites and Brutes into combat forms within seconds (as seen during [[Floodgate]]).
*Pure forms are introduced.
*Combat forms wield weapons far less frequently than in ''Halo: Combat Evolved'' and ''Halo 2''.
*Carrier forms release significantly more Pod infectors when they explode. The explosion does not push the player away much as in ''Halo: Combat Evolved'' and ''Halo 2''. In addition, carrier forms are significantly more difficult to kill with projectile weapons, but they are easily destroyed by plasma weapons.
*Running over Pod infectors while driving a vehicle can result in loss of steering and possibly overturning of the vehicle. Any Pod infectors that are hit by the vehicle will not pop.
*Flood combat forms can no longer commandeer vehicles, like they could in ''Halo 2''.
*Sticking a carrier form with a {{Pattern|Anskum|plasma grenade}} or [[Spike Grenade]] will kill both the carrier form and the pod infectors it carries. This is also true of a [[Kemuksuru|supercombine explosion]].
*Any weapon wielded by humans, Elites, and Brutes will not be dropped when transforming into combat forms and the combat forms will be also unarmed.
*Any humans, unshielded Elite, and Brutes have a low chance to resist or preventing the Pod Infector from infecting them.
*Any Pod infector latching into surviving humans, Elite, and Brutes before the infection can be shot at to prevent infection.
===Changes from ''Halo 3'' to ''Halo Wars''===
''Significant changes to the Flood's general existence were necessary due to the change of genre from first-person shooter to real-time strategy game. These are as follows.''
*Many new forms, such as [[Flood bomber form|bomber forms]], were created for ''Halo Wars'' to expand the "roster" of Flood units. The official explanation is that these forms were created from creatures indigenous to [[Trove]].
*Combat forms have more tentacles than before; they resemble spikes rather than flexible appendages.
*Grunts and Jackals can be converted to combat forms.
*Pod infectors do not explode when they are shot in the cinematics, instead 'deflating' like punctured balloons, though they still explode in gameplay.
*Carrier forms do ''not'' always explode upon death.
*Hero Units that do not have shields will be instantly downed regardless of any remaining HP on them, featuring an instant kill on any enemy infantry without energy shielding.
===Changes from ''Halo Wars'' to ''Halo Wars 2''===
*The Flood now has a Super Unit, The Abomination.
*New forms are introduced, such as [[Flood spawner form]]s, which can spawn Flood forms on the move and can spawn counter units.
*The Flood now only infects the Squad Leader(Either Jiralhanae or Sangheili depending on the Leader) in a Grunt Infantry unit, while the rest are killed. Marine units are entirely infected, retaining ''Halo Wars'' infection traits for humans.
*Pod infectors can now be killed more effectively with units that deal splash damage.
*The Flood can now infest and commandeer vehicles that are still operational, except Super Units and mechanical units (Mainly Sentinels).
**[[Seeder infector]], a new variety of Infection Form that is able to infect air units, is introduced.
**[[Flood infester form|Flood infestor]], a new kind of pure form, is introduced and specialized in infecting the vehicles.
**Infected mechanical vehicles are immune to Isabel's '''Ghost In The Machine''' Leader Power.
*Turret defenses have had their effectiveness reduced against Pod infectors, even those equipped with anti-infantry upgrades.
**Mega Turret and Siege Turret were exempted from this due to providing splash damage.
*The infection process affects all units. If the Pod Infector units doesn't match its victim (For example, Pod Infestor attacks infantry unit is not match for infection), it will be destroyed or killed. If match, the infection process can be started.
**Any infected units will revert their health back to 100% once the infection process has been completed.
**Infection process can be started once a unit is dying (Red Health).
*New structures for barricades are introduced.
*Pod infector squad size increased 3 to 4 times.
*Biohazard sign appears every time a unit has gotten infected.


==Gameplay==
==Gameplay==
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*Rather than corpses reanimating themselves, a Pod infector will enter the body, then reanimate it, even if the form was just eliminated.
*Rather than corpses reanimating themselves, a Pod infector will enter the body, then reanimate it, even if the form was just eliminated.
*If the player is attacked by a Pod infector while their shields are down, the character will die instantly. In ''Halo: Combat Evolved'', it would simply take a bar of health away.
*If the player is attacked by a Pod infector while their shields are down, the character will die instantly. In ''Halo: Combat Evolved'', it would simply take a bar of health away.
*Some combat forms derived from Elites still have functional energy shields. However, they never possess active camouflage, as some in ''Halo: Combat Evolved's'' final level did.
*Some combat forms derived from Elites still have functional energy shields. However, they never possess active camouflage, as some in ''Halo: Combat Evolved's'' [[The Maw |final level]] did.
*Flood combat forms can use vehicles, albeit clumsily, and are also able to board the player's vehicle; they will then proceed to melee the player character and pull them from the vehicle.
*Flood combat forms can use vehicles, albeit clumsily, and are also able to board the player's vehicle; they will then proceed to melee the player character and pull them from the vehicle.
*Melee attacks do little to no damage against the Flood in ''[[Halo: Combat Evolved]]''. They deal a bit more damage in ''[[Halo 2]]''.
*Melee attacks do little to no damage against the Flood in ''[[Halo: Combat Evolved]]''. They deal a bit more damage in ''[[Halo 2]]''.
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*Running over Pod infectors while driving a vehicle can result in loss of steering and possibly overturning of the vehicle. Any Pod infectors that are hit by the vehicle will not pop.
*Running over Pod infectors while driving a vehicle can result in loss of steering and possibly overturning of the vehicle. Any Pod infectors that are hit by the vehicle will not pop.
*Flood combat forms can no longer commandeer vehicles, like they could in ''Halo 2''.
*Flood combat forms can no longer commandeer vehicles, like they could in ''Halo 2''.
*Sticking a carrier form with a {{Pattern|Anskum|plasma grenade}} or [[Spike Grenade]] will kill both the carrier form and the pod infectors it carries. This is also true of a [[Subanese crystal|supercombine explosion]]
*Sticking a carrier form with a {{Pattern|Anskum|plasma grenade}} or [[Spike Grenade]] will kill both the carrier form and the pod infectors it carries. This is also true of a [[Kemuksuru|supercombine explosion]].
*Any weapon wielded by humans, Elites, and Brutes will not be dropped when transforming into combat forms and the combat forms will be also unarmed.
*Any weapon wielded by humans, Elites, and Brutes will not be dropped when transforming into combat forms and the combat forms will be also unarmed.
*Any humans, unshielded Elite, and Brutes have a low chance to resist or preventing the Pod Infector from infecting them.
*Any humans, unshielded Elite, and Brutes have a low chance to resist or preventing the Pod Infector from infecting them.
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**[[Seeder infector]], a new variety of Infection Form that is able to infect air units, is introduced.
**[[Seeder infector]], a new variety of Infection Form that is able to infect air units, is introduced.
**[[Flood infester form|Flood infestor]], a new kind of pure form, is introduced and specialized in infecting the vehicles.
**[[Flood infester form|Flood infestor]], a new kind of pure form, is introduced and specialized in infecting the vehicles.
**Infected mechanical vehicles are immune to Isabel's '''Ghost In The Machine''' Leader Power.
*Turret defenses have had their effectiveness reduced against Pod infectors, even those equipped with anti-infantry upgrades.
*Turret defenses have had their effectiveness reduced against Pod infectors, even those equipped with anti-infantry upgrades.
**Mega Turret and Siege Turret were exempted from this due to providing splash damage.
*The infection process affects all units. If the Pod Infector units doesn't match its victim (For example, Pod Infestor attacks infantry unit is not match for infection), it will be destroyed or killed. If match, the infection process can be started.
*The infection process affects all units. If the Pod Infector units doesn't match its victim (For example, Pod Infestor attacks infantry unit is not match for infection), it will be destroyed or killed. If match, the infection process can be started.
**Any infected units will revert their health back to 100% once the infection process has been completed.
**Any infected units will revert their health back to 100% once the infection process has been completed.
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==Production notes==
==Production notes==
{{linkbox|gallery=yes}}
{{linkbox|gallery=yes}}
[[File:HCE EarliestFlood Concept.jpg|thumb|right|The earliest extant concept art of the Flood, by Robert McLees.]]
[[File:HCE EarliestFlood Concept.jpg|thumb|The earliest extant concept art of the Flood, by Robert McLees.]]
===Miscellaneous===
===Miscellaneous===
* The Flood's AI routines in ''[[Halo: Combat Evolved]]'' were originally intended to be "every bit as complicated as the Covenant", but full implementation was prevented by time constraints.<ref>''EDGE'' magazine - September 2003, ''page 109''</ref>
* The Flood's AI routines in ''[[Halo: Combat Evolved]]'' were originally intended to be "every bit as complicated as the Covenant", but full implementation was prevented by time constraints.<ref>''EDGE'' magazine - September 2003, ''page 109''</ref>
Line 510: Line 588:
File:HL Origins BigFlood.png|A large unidentified Flood form seen in ''[[Origins|Origins I]]'' from ''[[Halo Legends]]''.
File:HL Origins BigFlood.png|A large unidentified Flood form seen in ''[[Origins|Origins I]]'' from ''[[Halo Legends]]''.
File:HL Origins BigFlood2.png|An up-close view of the same Flood form in Origins I.
File:HL Origins BigFlood2.png|An up-close view of the same Flood form in Origins I.
File:HINF-FloodFX.jpg|A Spartan-IV with Flood cosmetics in ''[[Halo Infinite]]''.
</gallery>
</gallery>


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*''[[Halo: Combat Evolved Anniversary]]''
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
{{col-2}}
*''[[Halo: Primordium]]''
*''[[Halo: Primordium]]''
*''[[Halo 4]]''
*''[[Halo 4]]''
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*''[[Halo: Spartan Assault]]''
*''[[Halo: Spartan Assault]]''
*''[[Halo: Escalation]]''
*''[[Halo: Escalation]]''
{{col-2}}
*''[[Halo: Mortal Dictata]]'' {{Mo}}
*''[[Halo: Mortal Dictata]]'' {{Mo}}
*''[[Halo: Broken Circle]]'' {{Mo}}
*''[[Halo: Broken Circle]]'' {{Mo}}
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*''[[Halo Infinite]]''
*''[[Halo Infinite]]''
*''[[Halo: The Rubicon Protocol]]'' {{Mo}}
*''[[Halo: The Rubicon Protocol]]'' {{Mo}}
*''[[Halo: Outcasts]]'' {{Mo}}
*''[[Halo: Saturn Devouring His Son]]''
*''[[Halo: The Television Series]]''
**''[[Unbound]]'' {{Mo}}
*''[[Halo: The Television Series Season Two]]''
**''[[Sanctuary (TV Series)|Sanctuary]]'' {{C|Visual allusion}}
**''[[Thermopylae (TV Series)|Thermoylae]]'' {{C|Visual allusion}}
**''[[Halo (TV Series)|Halo]]''
*''[[Halo: Epitaph]]''
{{col-end}}
{{col-end}}