Editing Sentinel

{{Era|Forerunner|Covenant|Human|UNSC|HCW|Post}}

'''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>  

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]].  

===Aggressors===

{{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.

 

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"/>

 

These turrets are portable and can be deployed.

 

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"/>

 

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>

 

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>

 

 

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>

 

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)======

These types of Protector Sentinel were deployed on [[Installation 00]], also known as the Ark.

 

The Retrievers, otherwise known as the Strato-Sentinels, are massive [[terraforming]] machines, used to gather raw materials for large-scale Forerunner [[astroengineering]] projects such as the [[Halo Array]].<ref name="p167"/>

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.

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>

{{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.

===Watcher===

{{Main|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>

===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>

==Behind the scenes==

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>

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

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