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{{Era|Forerunner|Covenant|Human|UNSC|HCW|Post}}
{{Status|Canon}}
{{Center|This is about the Forerunner constructs. For the UNSC AI type, see [[Navy Sentinel]]. For the achievement, see [[Sentinels (achievement)]].}}
{{Center|This is about the Forerunner constructs. For the UNSC AI type, see [[Navy Sentinel]]. For the achievement, see [[Sentinels (achievement)]].}}
[[File:H2-EnforcerSentinel-ScanScreen.jpg|300px|thumb|An [[Enforcer]] flanked by two [[Aggressor Sentinel|Aggressors]].]]
[[File:H2-EnforcerSentinel-ScanScreen.jpg|300px|thumb|An [[Enforcer]] flanked by two [[Aggressor Sentinel|Aggressors]].]]
'''Sentinels''' are autonomous machines created by the [[Forerunner]]s, designed for the construction, maintenance and defense of their structures and facilities.<ref name="p167">'''[[Halo: The Essential Visual Guide]]''', ''page 167''</ref> Various Sentinel variants exist, each tailored to a specific task; because of its ubiquity, the [[Aggressor Sentinel|Aggressor]] variant is often referred to simply as the "Sentinel". Most variants are produced by [[Sentinel manufacturing facility|Sentinel manufacturing facilities]], [[Sentinel shop]]s, or [[Sentinel launcher]]s. The Sentinels were revered by the [[Covenant]] as "holy warriors of the [[Halo Array|Sacred Rings]]".<ref>'''[[Halo 2]]''', campaign level ''[[The Arbiter]]'' - ''"A Whisper in the Storm"''</ref><ref>'''Halo: Hunters in the Dark''', ''page 83'' (Google Play edition)</ref>  
'''Sentinels''' are machine-servants{{Ref/Book|[[Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo]]|Section=Glossary|Page=92-93}} created by the [[Forerunner]]s, designed for the construction, maintenance and defense of their structures and facilities.<ref name="p167">'''[[Halo: The Essential Visual Guide]]''', ''page 167''</ref> Various Sentinel variants exist, each tailored to a specific task; because of its ubiquity, the [[Aggressor Sentinel|Aggressor]] variant is often referred to simply as the "Sentinel". Most variants are produced by [[Sentinel manufacturing facility|Sentinel manufacturing facilities]], [[Sentinel factory|Sentinel factories]], or [[Sentinel launcher]]s. The Sentinels were revered by the [[Covenant]] as "holy warriors of the [[Halo Array|Sacred Rings]]",<ref>'''[[Halo 2]]''', campaign level ''[[The Arbiter]]'' - ''"A Whisper in the Storm"''</ref><ref>'''Halo: Hunters in the Dark''', ''page 83'' (Google Play edition)</ref> despite engaging them in combat on various occasions.


The Sentinels follow the command of the [[monitor]] or other [[ancilla]] that is in charge of the facility they are assigned to, but even without central direction, they are able to respond to threats against their assigned installations with remarkable coordination and effectiveness.<ref>'''Halo Wars 2''', ''[[Phoenix Logs]] — Forerunner Sentinels''</ref><ref>'''[[Halo Wars 2]]''', campaign level ''[[Under The Dark]]''</ref> On [[Installation 00]], a sentinel defense network is used to coordinate the Sentinels on the Ark despite [[000 Tragic Solitude|the monitor]] no longer being present. Sentinels follow their directives even if this entails engaging other Forerunner machines. For example, the Aggressor Sentinels of [[Requiem]] remained loyal to the [[Librarian#Imprint_on_Requiem|Librarian]] against the [[Ur-Didact|Didact]]'s [[Promethean#Mechanical_Prometheans|Promethean]]s in [[2557]]. Another instance is when the Constructors of [[Genesis]] remained loyal to [[Monitor]] [[Exuberant Witness]] against the [[Created]]'s Promethean forces in [[2558]].  
==Overview==
The Sentinels follow the command of the [[monitor]] or other [[ancilla]] that is in charge of the facility they are assigned to, but even without central direction, they are able to respond to threats against their assigned installations with remarkable coordination and effectiveness.<ref>'''Halo Wars 2''', ''[[Phoenix Logs]] — Forerunner Sentinels''</ref><ref>'''[[Halo Wars 2]]''', campaign level ''[[Under The Dark]]''</ref> On [[Installation 00]], a sentinel defense network is used to coordinate the Sentinels on the Ark despite [[000 Tragic Solitude|the monitor]] no longer being present. Sentinels follow their directives even if this entails engaging other Forerunner machines. For example, the Aggressor Sentinels of [[Requiem]] remained loyal to the [[Librarian#Imprint on Requiem|Librarian]] against the [[Ur-Didact|Didact]]'s [[Promethean#Mechanical Prometheans|Promethean]]s in [[2557]]. Another instance is when the Constructors of [[Genesis]] remained loyal to [[Monitor]] [[Exuberant Witness]] against the [[Created]]'s Promethean forces in [[2558]].  


==Types of Sentinels==
===Sentinel Defense Network===
===Aggressors===
A Sentinel Defense Network is a system that coordinates sentinel defenses to perform their duties in defense of an installation. All Installation has the Defense Network installed and each has its own protocol. Without the defense network activated, Sentinels are unable to perform their duties. This, however, does not affect the stationary defenses, which remain active even if the defense network is shut down, including [[containment shield]]s.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Archive]]''</ref> The Defense Network itself is separated to local and global defense network. The local defense network only controls sentinels surrounding terminals, while the global defense network controls defenses on a global scale. The Defense Network is linked with every defensive protocol on the installation. [[Containment protocol]] on Installation 00 is linked with the Defense Network and Sentinels cannot conduct the protocol if the network is disabled.  
{{Main|Aggressor Sentinel}}
The Aggressor is the most common form of Sentinel, designed for the protection of Forerunner constructs and the small-scale suppression of Flood forms.<ref name="p167"/> There are many forms of Aggressor, though most follow the same basic layout. In the event of a severe threat, an advanced version of the Aggressor would be dispatched to assist the more common Aggressors.
 
===Assembler===
{{Main|Assembler Sentinel}}
Assemblers are presumably used to build and maintain Forerunner installations and technology, like the similarly named Constructors. Though they are not designed for combat, they will suspend their primary duties and engage Flood forms in the event of an outbreak.<ref name="p167"/>
 
===Automated Turret===
{{Main|Forerunner automated turret}}
These turrets are portable and can be deployed.
 
===Constructor===
{{Main|Constructor}}
The Constructors are specialized Sentinels, designed solely for the construction and servicing of Forerunner structures. Like Assemblers, they are not designed for combat, but they will engage the Flood if necessary.<ref name="p167"/>
 
===Controller===
{{Main|Controller}}
These sentinels were typically used to defend valuable technology on Installation 00. Their typical weaponry is a supercharged [[sentinel pulse]] as their main weapon, with a [[Sentinel beam]] to cover their blind spot. For defensive purposes, they can create an energy shield on their forward side. This shield is significantly stronger than that of the [[Enforcer]].<ref>'''Halo Wars 2'''</ref>
 
===Council===
A special variant of Sentinel was used aboard the Forerunner [[Capital]] for security purposes. They possessed black armor, matching the black-and-red armor of [[Ecumene Council]] security personnel.<ref>'''Halo: Cryptum''', ''page 294''</ref>
 
===Enforcer===
{{Main|Enforcer}}
The Enforcers are equipped with a variety of offensive and defensive measures, including [[pulse beam]]s, [[Forerunner missile launcher|missiles]], a last-resort [[Sentinel beam]], and three frontal [[energy shielding|energy shield]]s.<ref name="p167"/> They are designed to handle major Flood outbreaks, but are also capable of defending their Installation from other external threats.
 
===Gatherer===
{{Main|Gatherer}}
Gatherers seem to be deployed exclusively on [[Line installation]]s, and serve as collectors of biological specimens for the resident [[Monitor]]. They have offensive capabilities similar to Aggressors.<ref>'''Halo: Blood Line'''</ref>
 
===Protector===
{{Main|Protector Sentinel}}
======Shield World 0459 (Etran Harborage)======
{{Main|Protector Sentinel (Shield World 0459)}}
Roughly similar in appearance to regular Aggressors, Protectors are modular units capable of being modified into one of three variants: Offensive, which is a weaker version of the standard Aggressor; Shield, which projects an [[energy shielding|energy shield]] around its host unit; and Healing, which provides medical assistance to its host after combat.
 
======Installation 00 (The Ark)======
{{Main|Protector Sentinel (Installation 00)}}
These types of Protector Sentinel were deployed on [[Installation 00]], also known as the Ark.


===Strato===
[[Installation 09]] heightened the security protocol and immediately launched a [[Retriever Sentinel]] to cleanse the humans and the Banished present on the rings as soon as it left Installation 00. Professor Anders successfully hijacked the local network through the control tower to temporarily take control of Retriever Sentinel to disable barriers around the control room.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Halo]]''</ref>
{{Main|Strato-Sentinel}}
 
======Retriever======
{{Main|Retriever Sentinel}}
The Retrievers are a Sentinel type.
 
======Steward======
{{Main|Steward Sentinel}}
The Stewards are a variant of Strato-Sentinels,<ref name="steward">[https://www.halowaypoint.com/en-us/news/outpost-discoveries Canon Fodder: Outpost Discoveries] "'''Stewards''': These Sentinels accompany other Forerunner machines and assist them with their tasks, using a combination of support systems and offensive weaponry.The largest constructs are classified as '''strato-sentinels''', taking the roles of grand builders and overseeing architects for major Forerunner works. Those used in military applications were often classified as weapon-ships, capable of being fitted with naval-scale ordnance and defensive systems."</ref> are massive [[terraforming]] machines, used to gather raw materials for large-scale Forerunner [[astroengineering]] projects such as the [[Halo Array]].<ref name="p167"/>
 
===Onyx===
{{Main|Onyx Sentinel}}
Onyx Sentinels both guard and make up the artificial planet of [[Onyx]]. They use a much more powerful individual energy beam than the Aggressor, and have the ability to combine and transform themselves in order to complete a specific task. Onyx Sentinels are far more formidable opponents than more widely-used "standard" variants.
 
===Safeguard===
Fitted with powerful sterilization beams, the Safeguard Sentinels are highly efficient at containing and cauterizing intrusions into their assigned protectorate.<ref>[https://www.halowaypoint.com/en-us/news/bounty-hunters '''Halo Waypoint''' - ''Canon Fodder: Bounty Hunters'']</ref>
 
===Super===
{{Main|Super Sentinel}}
Considerably larger than Aggressors, Super Sentinels fill the same role as the [[Enforcer]]s - combating large-scale Flood outbreaks.
 
===Unidentified Sentinel variant===
{{Main|Unidentified Sentinel variant}}
The largest Sentinel variant seen to date, this Sentinel is able to level entire cities with its weaponry.
 
===Sentinel Defense Network===
A Sentinel Defense Network is a system that coordinates sentinel defenses to perform their duties in defense of an installation. [[Installation 00]] is the only installation known to have a defense network installed. Without the defense network activated, Sentinels are unable to perform their duties. This however, does not affect the stationary defenses, which remain active even if the defense network is shut down, including [[containment shield]]s.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Archive]]''</ref> The Defense Network itself is separated to local and global defense network. The local defense network only controls sentinels surrounding terminals, while the global defense network controls defenses on a global scale. The Defense Network is linked with every defensive protocol on the installation. [[Containment protocol]] on Installation 00 is linked with the Defense Network and Sentinels cannot conduct the protocol if the network is disabled. The Smart AI Isabel manipulated the Sentinel Defense Network to her own ends by hijacking [[Enduring Conviction]] and firing its energy projector on the Ark, causing Aggressor Sentinels to swarm on the ship and bisect it.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[Under the Dark]]''</ref>


The Smart AI Isabel manipulated the Sentinel Defense Network to her own ends by hijacking ''[[Enduring Conviction]]'' and firing its energy projector on the Ark, causing Aggressor Sentinels to swarm on the ship and bisect it.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[Under the Dark]]''</ref>


==Promethean Types==
When Voridus shut down the Sentinel Defense Network, all Sentinel activities are ceased immediately, giving Voridus a clear path to the High Charity without any opposition.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[What Could Go Wrong?]]''</ref> When Voridus reactivated the Sentinel Defense Network, the Sentinels were immediately resumed their duty, allowing Pavium and Voridus to call in Retriever Sentinel to defeat Proto-Gravemind.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[Manifestation]]''</ref>
While most Sentinels were purposed for construction and maintenance by the [[Builder]] [[Rate]], some Sentinels were used by [[Promethean]]s from the [[Warrior-Servant]] [[Rate]].


===Watcher===
==Types==
{{Main|Promethean Watcher}}
*'''[[Aggressor Sentinel]]''' - The Aggressor is the most common form of Sentinel, designed for the protection of Forerunner constructs and the small-scale suppression of Flood forms.{{Ref/Reuse|p167}} There are many forms of Aggressor, though most follow the same basic layout. In the event of a severe threat, an advanced version of the Aggressor would be dispatched to assist the more common Aggressors.
The Watcher is a Sentinel variant used by [[Promethean Knight]]s for combat support. They can heal and augment their damaged allies and return incoming ordnance such as grenades using a gravity-displacement beam.<ref>[http://halo.xbox.com/halo4#!an-epic-universe/characters/8c164b48-05e7-4c13-a268-f60ec3a72938 '''Halo 4 Official Site''': ''CHARACTERS'']</ref>
<gallery class="center">
File:H4 Sentinel.png|One type of Aggressor Sentinel.
File:H2A Silver sent.png|A different type of Aggressor Sentinel.
File:H2A Gold Sentinel.png|A [[Aggressor Sentinel Eliminator|gold Aggressor Sentinel]].
</gallery>
*'''[[Constructor]]''' - The Constructors are specialized Sentinels, designed solely for the construction and servicing of Forerunner structures. Like Assemblers, they are not designed for combat, but they will engage the Flood if necessary.{{Ref/Reuse|p167}}
<gallery class=center>
File:H3-SentinelConstructor.png|One type of Constructor Sentinel.
File:H5G-Constructor.png|A different type of Constructor Sentinel.
</gallery>
*'''[[Controller]]''' - These sentinels were typically used to defend valuable technology on Installation 00. Their typical weaponry is a supercharged [[sentinel pulse]] as their main weapon, with a [[Sentinel beam]] to cover their blind spot. For defensive purposes, they can create an energy shield on their forward side. This shield is significantly stronger than that of the [[Enforcer]].<ref>'''Halo Wars 2'''</ref>
<gallery class=center>
File:HW2-Controller.png|A Controller Sentinel.
</gallery>
*'''[[Council sentinel|Council]]''' - A special variant of Sentinel was used aboard the Forerunner [[Capital]] for security purposes. They possessed black armor, matching the black-and-red armor of [[Ecumene Council]] security personnel.<ref>'''Halo: Cryptum''', ''page 294''</ref>
*'''[[Enforcer]]''' - The Enforcers are equipped with a variety of offensive and defensive measures, including [[shard cannon]]s, [[Forerunner missile launcher|missiles]], a last-resort [[Sentinel beam]], and three frontal [[energy shielding|energy shield]]s.{{Ref/Reuse|p167}} They are designed to handle major Flood outbreaks, but are also capable of defending their Installation from other external threats.
<gallery class=center>
File:Enforcer.png|An Enforcer Sentinel.
</gallery>
*'''[[Eradicator Sentinel|Eradicator]]''' - A variant of Sentinel often utilized used as combat carapaces by [[Facilitator-class ancilla|adjutant sub-monitors]] in defense of their assigned Forerunner installations.{{Ref/Book|Id=Enc22|Enc22|Page=329}}
<gallery class=center>
File:HINF-SentinelBossRender.jpg|An Eradicator Sentinel.
File:HINF Adjutant Resolution Chassis.png|[[Adjutant Resolution]] within his Eradicator.
</gallery>
*'''[[Gatherer]]''' - Multipurpose Sentinels with the functions of maintaining ecological stability in constructed biomes and the gathering of various living specimens for [[Lifeworker]] activities.<ref>'''Halo: Blood Line'''</ref>{{Ref/Book|Id=Enc22P328|Enc22|Page=328}}
<gallery class=center>
File:HBL-Issue1-FullPage-TheGatherer.jpg|A Gatherer Sentinel.
</gallery>
*'''[[Guardian Sentinel]]''' - A large type of Sentinel.{{Ref/Map|Halo 3|[[Epitaph]]}}
<gallery class=center>
File:H3 Epitaph Hologram.png|A [[hologram]] of a [[Guardian Sentinel]].
</gallery>
*'''[[Monitor]]''' - A general purpose Sentinel, containing a high-level ancilla.{{Ref/Book|Id=warfleetglossary|[[Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo]]|Section=Glossary|Page=90-91}}
<gallery class=center>
File:HTMCC-H2A 343GuiltySpark.png|The Monitor [[343 Guilty Spark]].
</gallery>
*'''[[Promethean Watcher]]''' - The Watcher is a Sentinel variant used by [[Promethean Knight]]s for combat support. They can heal and augment their damaged allies and return incoming ordnance such as grenades using a gravity-displacement beam.<ref>[http://halo.xbox.com/halo4#!an-epic-universe/characters/8c164b48-05e7-4c13-a268-f60ec3a72938 '''Halo 4 Official Site''': ''CHARACTERS'']</ref>
<gallery class=center>
File:H5G guide - Watcher.png|A Promethean Watcher.
</gallery>
*'''[[Protector Sentinel|Protector]]''' - A type of Sentinel encompassing a few different models.
<gallery class=center>
File:HW-Protector Sentinels.jpg|[[Trove]] [[Protector Sentinel (Trove)|Protector Sentinel]]s. Roughly similar in appearance to regular Aggressors, these Protectors are modular units that can become one of three variants: Offensive, Shield, and Healing.
File:HW2 Blitz Protector Sentinel.png|An [[Installation 00]] [[Protector Sentinel (Installation 00)|Protector Sentinel]].
</gallery>
*'''[[Regulator Sentinel]]''' - A variant of Sentinel designed for the purpose of surveying, assessing, and managing system processes on [[Forerunner]] installations.{{Ref/Book|Id=Enc22P327|Enc22|Page=327}}
<gallery class=center>
File:HINF SniperSentinelCrop.png|A [[Regulator Sentinel]].
</gallery>
*'''[[Strato-Sentinel]]''' - A class of large Sentinels.
<gallery class=center>
File:HW2 Retriever.png|A [[Retriever Sentinel]].
File:HOD Steward Render.png|A [[Steward Sentinel]], a variant of Strato-Sentinels,<ref name="steward">[https://www.halowaypoint.com/en-us/news/outpost-discoveries Canon Fodder: Outpost Discoveries] "'''Stewards''': These Sentinels accompany other Forerunner machines and assist them with their tasks, using a combination of support systems and offensive weaponry.The largest constructs are classified as '''strato-sentinels''', taking the roles of grand builders and overseeing architects for major Forerunner works. Those used in military applications were often classified as weapon-ships, capable of being fitted with naval-scale ordnance and defensive systems."</ref> are massive [[terraforming]] machines, used to gather raw materials for large-scale Forerunner [[astroengineering]] projects such as the [[Halo Array]].{{Ref/Reuse|p167}}
File:H4-Concept-Sentinel-Retriever.jpg|An [[Assembler Sentinel]], a variant not designed for combat. they will suspend their primary duties and engage Flood forms in the event of an outbreak.{{Ref/Reuse|p167}}
</gallery>
*'''[[Onyx Sentinel]]''' - Onyx Sentinels both guard and make up the artificial planet of [[Onyx]]. They use a much more powerful individual energy beam than the Aggressor, and have the ability to combine and transform themselves in order to complete a specific task. Onyx Sentinels are far more formidable opponents than more widely-used "standard" variants.
*'''[[Safeguard Sentinel]]''' - Fitted with powerful sterilization beams, the Safeguard Sentinels are highly efficient at containing and cauterizing intrusions into their assigned protectorate.<ref>[https://www.halowaypoint.com/en-us/news/bounty-hunters '''Halo Waypoint''' - ''Canon Fodder: Bounty Hunters'']</ref>
*'''[[Super Sentinel]]''' - Considerably larger than Aggressors, Super Sentinels fill the same role as the [[Enforcer]]s - combating large-scale Flood outbreaks.
<gallery class=center>
File:HW-SuperSentinel.png|A Super Sentinel.
</gallery>
*'''Unidentified sentinel variants'''
<gallery class=center>
File:Origins-Unnamed-Sentinel.png|[[Unidentified Sentinel variant|A large variant]] in one of it's two forms.
</gallery>


===Autosentry===
==Production notes==
{{main|Z-2500 autosentry}}
Sentinels were seen in ''[[Halo Infinite]]''{{'}}s [[Halo Infinite announcement trailer|announcement trailer]] at [[Wikipedia:Electronic Entertainment Expo 2018|E3 2018]].<ref name="HIT">''[[Halo Infinite]]'' [[Halo Infinite announcement trailer|reveal trailer]]</ref><ref name="TMOTHIAT">[https://www.youtube.com/watch?v=PTreFoLAufw '''YouTube''' - ''The Making of the Halo Infinite Announce Trailer'']</ref>
Deploy-able sentries.


==Focus turret==
==Gallery==
{{main|Z-510 focus turret}}
===Concept art===
This turret charges up and fires a powerful beam.
<gallery>
File:HW2 Concept ScourerSentinel.jpg|Concept art of a "Scourer" Sentinel for ''[[Halo Wars 2]]''.
File:HINF DiskSentinelConcept1.jpg|Concept art of a disk-shaped Sentinel for ''[[Halo Infinite]]''.
File:HINF DiskSentinelConcept2.jpg|More concept art of the disk-shaped Sentinel.
File:HINF SentinelCarrierConcept.jpg|Concept art for ''Halo Infinite'' depicting a large Sentinel seemingly designed to carry other smaller Sentinels.
File:HINF WingedSentinelConcept2.jpg|Concept art of a large winged Sentinel for ''Halo Infinite''.
File:HINF WingedSentinelConcept3.jpg|More concept art of this Sentinel.
File:HINF WingedSentinelConcept1.jpg|More concept art of this Sentinel.
File:HINF Concept TowerSentinel.png|Concept art of a Sentinel that rests on the ground prior to the deployment with a shape reminiscent of a [[beacon tower]].
File:HINF Concept SurpriseSentinel.png|Concept art of another Sentinel which could deploy from the ground.
File:HINF SentinelConcept1.jpg|Concept art of a different Sentinel in ''Halo Infinite''.
File:HINF SentinelMovementConcept.jpg|Concept art exploring how Sentinels move, fire, and react to damage in ''Halo Infinite''.
File:HINF SupportSentinelConcept.jpg|Concept art of a "support" Sentinel for ''Halo Infinite''.
File:HINF SentinelSketchConcepts.jpg|Concept art of other kinds of Sentinels for ''Halo Infinite''.
File:HINF SentinelSketchConcepts2.jpg|Concept art of more kinds of Sentinels.
File:HINF SentinelWeaponConcepts1.jpg|Concept art of various weapons to be used by Sentinels in ''Halo Infinite''.
File:HINF SentinelWeaponConcepts2.jpg|More weapon concepts.
File:HINF SentinelWeaponConcepts3.jpg|More weapon concepts.
File:HINF Concept SentinelThreat1.jpg|Concept art of John-117 facing down a large Sentinel in ''Halo Infinite''.
File:HINF Concept SentinelThreat2.jpg|More concept art of John and a large Sentinel.
File:HINF Concept SentinelThreat3.jpg|More concept art of John and a large Sentinel.
File:HINF Concept SentinelThreat4.jpg|More concept art of John and a large Sentinel.
</gallery>


==Behind the scenes==
===Screenshots===
Sentinels were seen in ''[[Halo Infinite]]'''s [[Halo Infinite - E3 2018 - Announcement Trailer|announcement trailer]] at [[Wikipedia:Electronic Entertainment Expo 2018|E3 2018]].<ref name="HIT">''[[Halo Infinite]]'' [[Halo Infinite - E3 2018 - Announcement Trailer|reveal trailer]]</ref><ref name="TMOTHIAT">[https://www.youtube.com/watch?v=PTreFoLAufw '''YouTube''' - ''The Making of the Halo Infinite Announce Trailer'']</ref>
<gallery>
File:Origins H3 Sentinels.png|A group of Sentinels, including a Strato-Sentinels, Guardians and an unidentified variant in ''[[Halo Legends]]''.
File:HOD RingExperience Interior.jpg|Hundreds of Sentinels of varying types.
File:HINF SentinelCrop.png|An Aggressor Sentinel as seen in [[Halo Infinite]].
</gallery>


==List of appearances==
==List of appearances==
Line 114: Line 138:
*''[[Halo: Glasslands]]'' {{Mo}}
*''[[Halo: Glasslands]]'' {{Mo}}
*''[[Halo: Combat Evolved Anniversary]]''
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal/Halo: Combat Evolved Anniversary|Terminals]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
*''[[Halo: Primordium]]''
*''[[Halo: Primordium]]''
*''[[Halo 4]]''
*''[[Halo 4]]''
Line 135: Line 159:
*''[[Halo: Official Spartan Field Manual]]''
*''[[Halo: Official Spartan Field Manual]]''
*''[[Halo: Renegades]]'' {{Mo}}
*''[[Halo: Renegades]]'' {{Mo}}
*''[[Halo: Shadows of Reach]]''
**''[[Sacrifice]]'' {{Mo}}
*''[[Halo: Point of Light]]''
*''[[Halo Infinite]]''
*''[[Halo Infinite]]''
*''[[Halo: The Rubicon Protocol]]''
*''[[Halo: Outcasts]]'' {{Mo}}
{{col-end}}
{{col-end}}


==Sources==
==Sources==
<references/>
{{Ref/Sources}}


{{Forerunner}}
{{Forerunner/Sentinel}}


[[Category:Sentinels| ]]
[[Category:Sentinels| ]]
[[Category:Forerunner technology]]
[[Category:Forerunner technology]]

Latest revision as of 15:15, February 13, 2024

This is about the Forerunner constructs. For the UNSC AI type, see Navy Sentinel. For the achievement, see Sentinels (achievement).
An Enforcer flanked by two Aggressors.

Sentinels are machine-servants[1] created by the Forerunners, designed for the construction, maintenance and defense of their structures and facilities.[2] Various Sentinel variants exist, each tailored to a specific task; because of its ubiquity, the Aggressor variant is often referred to simply as the "Sentinel". Most variants are produced by Sentinel manufacturing facilities, Sentinel factories, or Sentinel launchers. The Sentinels were revered by the Covenant as "holy warriors of the Sacred Rings",[3][4] despite engaging them in combat on various occasions.

Overview[edit]

The Sentinels follow the command of the monitor or other ancilla that is in charge of the facility they are assigned to, but even without central direction, they are able to respond to threats against their assigned installations with remarkable coordination and effectiveness.[5][6] On Installation 00, a sentinel defense network is used to coordinate the Sentinels on the Ark despite the monitor no longer being present. Sentinels follow their directives even if this entails engaging other Forerunner machines. For example, the Aggressor Sentinels of Requiem remained loyal to the Librarian against the Didact's Prometheans in 2557. Another instance is when the Constructors of Genesis remained loyal to Monitor Exuberant Witness against the Created's Promethean forces in 2558.

Sentinel Defense Network[edit]

A Sentinel Defense Network is a system that coordinates sentinel defenses to perform their duties in defense of an installation. All Installation has the Defense Network installed and each has its own protocol. Without the defense network activated, Sentinels are unable to perform their duties. This, however, does not affect the stationary defenses, which remain active even if the defense network is shut down, including containment shields.[7] The Defense Network itself is separated to local and global defense network. The local defense network only controls sentinels surrounding terminals, while the global defense network controls defenses on a global scale. The Defense Network is linked with every defensive protocol on the installation. Containment protocol on Installation 00 is linked with the Defense Network and Sentinels cannot conduct the protocol if the network is disabled.

Installation 09 heightened the security protocol and immediately launched a Retriever Sentinel to cleanse the humans and the Banished present on the rings as soon as it left Installation 00. Professor Anders successfully hijacked the local network through the control tower to temporarily take control of Retriever Sentinel to disable barriers around the control room.[8]

The Smart AI Isabel manipulated the Sentinel Defense Network to her own ends by hijacking Enduring Conviction and firing its energy projector on the Ark, causing Aggressor Sentinels to swarm on the ship and bisect it.[9]

When Voridus shut down the Sentinel Defense Network, all Sentinel activities are ceased immediately, giving Voridus a clear path to the High Charity without any opposition.[10] When Voridus reactivated the Sentinel Defense Network, the Sentinels were immediately resumed their duty, allowing Pavium and Voridus to call in Retriever Sentinel to defeat Proto-Gravemind.[11]

Types[edit]

  • Aggressor Sentinel - The Aggressor is the most common form of Sentinel, designed for the protection of Forerunner constructs and the small-scale suppression of Flood forms.[2] There are many forms of Aggressor, though most follow the same basic layout. In the event of a severe threat, an advanced version of the Aggressor would be dispatched to assist the more common Aggressors.
  • Constructor - The Constructors are specialized Sentinels, designed solely for the construction and servicing of Forerunner structures. Like Assemblers, they are not designed for combat, but they will engage the Flood if necessary.[2]
  • One type of Constructor Sentinel.

    One type of Constructor Sentinel.

  • A different type of Constructor Sentinel.

    A different type of Constructor Sentinel.

  • Controller - These sentinels were typically used to defend valuable technology on Installation 00. Their typical weaponry is a supercharged sentinel pulse as their main weapon, with a Sentinel beam to cover their blind spot. For defensive purposes, they can create an energy shield on their forward side. This shield is significantly stronger than that of the Enforcer.[12]
  • A Controller Sentinel.

    A Controller Sentinel.

  • Council - A special variant of Sentinel was used aboard the Forerunner Capital for security purposes. They possessed black armor, matching the black-and-red armor of Ecumene Council security personnel.[13]
  • Enforcer - The Enforcers are equipped with a variety of offensive and defensive measures, including shard cannons, missiles, a last-resort Sentinel beam, and three frontal energy shields.[2] They are designed to handle major Flood outbreaks, but are also capable of defending their Installation from other external threats.
  • An Enforcer Sentinel.

    An Enforcer Sentinel.

  • Gatherer - Multipurpose Sentinels with the functions of maintaining ecological stability in constructed biomes and the gathering of various living specimens for Lifeworker activities.[15][16]
  • A Gatherer Sentinel.

    A Gatherer Sentinel.

  • Monitor - A general purpose Sentinel, containing a high-level ancilla.[18]
  • Promethean Watcher - The Watcher is a Sentinel variant used by Promethean Knights for combat support. They can heal and augment their damaged allies and return incoming ordnance such as grenades using a gravity-displacement beam.[19]
  • A Promethean Watcher.

    A Promethean Watcher.

  • Protector - A type of Sentinel encompassing a few different models.
  • Onyx Sentinel - Onyx Sentinels both guard and make up the artificial planet of Onyx. They use a much more powerful individual energy beam than the Aggressor, and have the ability to combine and transform themselves in order to complete a specific task. Onyx Sentinels are far more formidable opponents than more widely-used "standard" variants.
  • Safeguard Sentinel - Fitted with powerful sterilization beams, the Safeguard Sentinels are highly efficient at containing and cauterizing intrusions into their assigned protectorate.[22]
  • Super Sentinel - Considerably larger than Aggressors, Super Sentinels fill the same role as the Enforcers - combating large-scale Flood outbreaks.
  • A Super Sentinel.

    A Super Sentinel.

  • Unidentified sentinel variants

Production notes[edit]

Sentinels were seen in Halo Infinite's announcement trailer at E3 2018.[23][24]

Gallery[edit]

Concept art[edit]

  • Concept art of a "Scourer" Sentinel for Halo Wars 2.

    Concept art of a "Scourer" Sentinel for Halo Wars 2.

  • Concept art of a disk-shaped Sentinel for Halo Infinite.

    Concept art of a disk-shaped Sentinel for Halo Infinite.

  • More concept art of the disk-shaped Sentinel.

    More concept art of the disk-shaped Sentinel.

  • Concept art for Halo Infinite depicting a large Sentinel seemingly designed to carry other smaller Sentinels.

    Concept art for Halo Infinite depicting a large Sentinel seemingly designed to carry other smaller Sentinels.

  • Concept art of a large winged Sentinel for Halo Infinite.

    Concept art of a large winged Sentinel for Halo Infinite.

  • More concept art of this Sentinel.

    More concept art of this Sentinel.

  • More concept art of this Sentinel.

    More concept art of this Sentinel.

  • Concept art of a Sentinel that rests on the ground prior to the deployment with a shape reminiscent of a beacon tower.

    Concept art of a Sentinel that rests on the ground prior to the deployment with a shape reminiscent of a beacon tower.

  • Concept art of another Sentinel which could deploy from the ground.

    Concept art of another Sentinel which could deploy from the ground.

  • Concept art of a different Sentinel in Halo Infinite.

    Concept art of a different Sentinel in Halo Infinite.

  • Concept art exploring how Sentinels move, fire, and react to damage in Halo Infinite.

    Concept art exploring how Sentinels move, fire, and react to damage in Halo Infinite.

  • Concept art of a "support" Sentinel for Halo Infinite.

    Concept art of a "support" Sentinel for Halo Infinite.

  • Concept art of other kinds of Sentinels for Halo Infinite.

    Concept art of other kinds of Sentinels for Halo Infinite.

  • Concept art of more kinds of Sentinels.

    Concept art of more kinds of Sentinels.

  • Concept art of various weapons to be used by Sentinels in Halo Infinite.

    Concept art of various weapons to be used by Sentinels in Halo Infinite.

  • More weapon concepts.

    More weapon concepts.

  • More weapon concepts.

    More weapon concepts.

  • Concept art of John-117 facing down a large Sentinel in Halo Infinite.

    Concept art of John-117 facing down a large Sentinel in Halo Infinite.

  • More concept art of John and a large Sentinel.

    More concept art of John and a large Sentinel.

  • More concept art of John and a large Sentinel.

    More concept art of John and a large Sentinel.

  • More concept art of John and a large Sentinel.

    More concept art of John and a large Sentinel.

Screenshots[edit]

  • A group of Sentinels, including a Strato-Sentinels, Guardians and an unidentified variant in Halo Legends.

    A group of Sentinels, including a Strato-Sentinels, Guardians and an unidentified variant in Halo Legends.

  • Hundreds of Sentinels of varying types.

    Hundreds of Sentinels of varying types.

  • An Aggressor Sentinel as seen in Halo Infinite.

    An Aggressor Sentinel as seen in Halo Infinite.

List of appearances[edit]

Sources[edit]

  1. ^ Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo - Glossary, page 92-93
  2. ^ a b c d e f Halo: The Essential Visual Guide, page 167
  3. ^ Halo 2, campaign level The Arbiter - "A Whisper in the Storm"
  4. ^ Halo: Hunters in the Dark, page 83 (Google Play edition)
  5. ^ Halo Wars 2, Phoenix Logs — Forerunner Sentinels
  6. ^ Halo Wars 2, campaign level Under The Dark
  7. ^ Halo Wars 2, Campaign level The Archive
  8. ^ Halo Wars 2, Campaign level The Halo
  9. ^ Halo Wars 2, Campaign level Under the Dark
  10. ^ Halo Wars 2, Campaign level What Could Go Wrong?
  11. ^ Halo Wars 2, Campaign level Manifestation
  12. ^ Halo Wars 2
  13. ^ Halo: Cryptum, page 294
  14. ^ Halo Encyclopedia (2022 edition), page 329
  15. ^ Halo: Blood Line
  16. ^ Halo Encyclopedia (2022 edition), page 328
  17. ^ Halo 3, multiplayer map Epitaph
  18. ^ Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo - Glossary, page 90-91
  19. ^ Halo 4 Official Site: CHARACTERS
  20. ^ Halo Encyclopedia (2022 edition), page 327
  21. ^ Canon Fodder: Outpost Discoveries "Stewards: These Sentinels accompany other Forerunner machines and assist them with their tasks, using a combination of support systems and offensive weaponry.The largest constructs are classified as strato-sentinels, taking the roles of grand builders and overseeing architects for major Forerunner works. Those used in military applications were often classified as weapon-ships, capable of being fitted with naval-scale ordnance and defensive systems."
  22. ^ Halo Waypoint - Canon Fodder: Bounty Hunters
  23. ^ Halo Infinite reveal trailer
  24. ^ YouTube - The Making of the Halo Infinite Announce Trailer

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Sentinels
Types
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