Editing Sentinel

{{Era|Forerunner|Covenant|Human|UNSC|HCW|Post}}
{{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]].]]
'''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". All variants are produced by [[Sentinel manufacturing facility|Sentinel manufacturing facilities]]. 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> 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==
===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.

===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 can 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"/>

===Council Sentinel===
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}}
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.

===Retriever===
{{Main|Retriever Sentinel}}
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 Sentinel===
{{Main|Onyx Sentinel}}
Onyx Sentinels both guard and make up the artificial planet of [[Onyx]]. With a much more powerful individual energy beam, as well as the ability to combine and transform themselves in order to complete a specific task. Onyx Sentinels are far more formidable opponents than their more 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 Sentinel===
{{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>

==Appearances==
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==Sources==
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{{Forerunner}}

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