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{{Ratings}}
{{Status|Canon}}{{Status|Featured}}
{{era|H1|H2|H3|HW|TF|GOO|IRIS}}
{{Disambig header|the standard sentinel introduced in ''[[Halo: Combat Evolved]]''|the golden variant introduced in ''[[Halo 2]]''|Aggressor Sentinel Eliminator}}
 
{{Forerunner infobox
 
|name= Aggressor Sentinel
 
|image= [[File:HINF SentinelCrop.png|300px]]
 
|role=*Defense{{Ref/Reuse|Enc22}}
 
*Maintenance{{Ref/Reuse|Enc22}}
{{Cleanup}}
*Offense{{Ref/Reuse|Enc22}}
{{Forerunner Infobox
*Utility{{Ref/Reuse|Enc22}}
|image             = [[Image:Halo Wars Sentinel.jpg|300px]]
|first seen=
|name              = Sentinel
|length={{Convert|9.6|ft|m|sp=us|disp=flip}}{{Ref/Reuse|h4evg}} - {{Convert|13.5|ft|m|sp=us|disp=flip}}{{Ref/Book|Id=Enc22|Enc22|Page=327}}
|purpose          = Combating Major [[Flood]] Infestations
|width={{Convert|6.3|ft|m|sp=us|disp=flip}}{{Ref/Reuse|h4evg}} - {{Convert|7.4|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|strength          = Moderate
|height={{Convert|5|ft|m|sp=us|disp=flip}}{{Ref/Reuse|h4evg}} - {{Convert|7.6|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|first seen        = September 21 2552
|armament=[[Sentinel beam]] {{C|standard}}{{Ref/Reuse|Enc22}}<br>
|primary          = [[Sentinel Beam]]
[[Heatwave]] {{C|rarely}}{{Ref/Game|Id=HINF|HINF}}
|weaponry strength = Moderate
|armor=[[Energy shields]]{{Ref/Reuse|Enc22}}
|defense          = [[Energy Shields]]
}}
}}
{{Quote|Sentinels! The holy warriors of the sacred rings!|A Special Operations Sangheili exclaimed upon seeing Aggressor Sentinels in the [[Threshold gas mine]]<ref name="TA">'''[[Halo 2]]''', campaign level ''[[The Arbiter]]''</ref>}}
'''Aggressor Sentinels'''<ref name="EVG">'''[[Halo: The Essential Visual Guide]]''', ''page 167''</ref> {{ZClass|1500|Automated Systems Drones|ASD}}<ref name="h4evg">'''[[Halo 4: The Essential Visual Guide]]''', ''page 133''</ref> are [[Forerunner]] automatons programmed to act as security and maintenance drones, suppress small-scale [[Flood]] outbreaks, and protect Forerunner installations. As the basic type of the fairly inclusive [[Sentinel]] class, Aggressors are generally referred to simply as '''Sentinels'''.{{Ref/Reuse|EVG}}


==Overview==
[[File:Halo3-21146876-Full-crop.jpg|250px|left|thumb|[[John-117]] has a face-to-face encounter with an Aggressor Sentinel on [[Installation 00]].]]
===Design details===
Aggressor Sentinels have two arm-like appendages, with two fine manipulators at the end of each arm. Their central head rests above a curved undercarriage generally housing an offensive [[Sentinel beam|sterilization beam]]. Their powerful beam weapons and defensive energy shields make them very effective in combat against intruders or foreign objects that present themselves as threats. Aggressor Sentinels are also equipped with a small [[reconstitution emitter]], which uses lasers to repair damaged [[Forerunner]] constructs in conjunction with [[Constructor]]s and for self-repair should the Aggressors be damaged in combat.{{Ref/Reuse|encyclopedia}} Aggressors are propelled by both an anti-gravity unit located on the undercarriage and small, exotic form of [[impulse drive]] which enables them to travel at high speeds.{{Ref/Reuse|h4evg}} They are also capable of tapping into their installation's [[teleportation grid]].{{Ref/Reuse|h4evg}}


There are at least two major variants of the Aggressor Sentinel. The standard model is gray or silver in color while the specialized [[Aggressor Sentinel Eliminator]] is golden. The differences between the two variants lie solely on their offensive and defensive systems, with the Eliminator sporting superior weaponry and shielding systems.{{Ref/Level|Id=SI|H2|Level=Sacred Icon}}{{Ref/Level|Id=QZ|H2|Level=Quarantine Zone}}{{Ref/Reuse|HINF}}


Aggressors are created at [[Sentinel manufacturing facility|specialized manufacturing facilities]] located on every [[Halo Array|Halo installation]] and on other key Forerunner installations.{{Ref/Reuse|encyclopedia}} These facilities can consist of large airborne platforms or [[Sentinel factory|subterranean factories]] where Aggressors are birthed in nanomachine vats and programmed to serve.{{Ref/Reuse|QZ}}{{Ref/Game|Id=HW|HW}}{{Ref/Book|Id=Enc22p326|Enc22|Page=326}} Each Forerunner installation has its own design of the Aggressor Sentinel, but they all share the same basic structure and purpose.{{Ref/Reuse|Enc22}}


===Operation===
[[File:H3 Sentinel Shielding.jpg|thumb|250px|An Aggressor Sentinel's energy shield.]]
Aggressor Sentinels were deployed in massive numbers during the [[Forerunner-Flood war]].{{Ref/Reuse|Enc22}} Unlike their own [[Warrior-Servant|biological soldiers]] that could be converted into biomass, the mechanical nature of the Aggressor Sentinels allowed the Forerunners to battle the [[Flood]] without contributing to its numbers.{{Ref/Reuse|encyclopedia}} Billions are estimated to be active across the myriad of Forerunner installations where they are utilized as all-purpose workers and guards.{{Ref/Reuse|Enc22}} Following the construction of the Halo Array, they were installed on the ringworlds as their first line of defense against Flood outbreaks and other external threats. Controlled by their own basic ancilla functions, as well as their installation's [[monitor]], Aggressors patrol the installation's vast terrain and network tunnels tirelessly and attack as their protocol demands.<ref name="encyclopedia">'''[[Halo Encyclopedia (2009 edition)]]''', "Chapter 8", ''page 226-227''</ref>


When not in combat, Aggressors serve as basic repair, maintenance, and security drones for Forerunner installations and facilities where Flood samples are kept, working in conjunction with [[Constructor]]s and [[Enforcer]]s to ensure that the facility remains in working order.{{Ref/Reuse|SI}}


The [[keyship]] ''[[Anodyne Spirit]]'' was equipped with its own contingent of Aggressor Sentinels. The [[San'Shyuum]] managed to adapt these machines to serve them in a combat support role, using them in battles during the [[War of Beginnings]] before the [[Covenant]]'s formation.<ref>'''Halo: Broken Circle''', ''pages 6, 9''</ref> The war depleted the keyship's Sentinel contingent almost completely, and the few that remained in ''[[High Charity]]'' were regarded as relics to be preserved and were no longer used in combat.<ref>'''Halo: Broken Circle''', ''page 189''</ref>


===Combat behavior===
[[File:H2A FirinMahLazer.png|thumb|225px|left|An Aggressor Sentinel firing its sterilization beam.]]
Aggressor Sentinels are the first automated defense systems to assist a in a given situation and generate a proper response protocol, deploying to an area of interest via [[Sentinel emitter|wall-mounted emitters]].{{Ref/Reuse|SI}}{{Ref/Reuse|HINF}} While Aggressors are strong enough to handle small-scale battles, they are more of a supplement rather than a reliable combat system. The Aggressors' weapons systems are limited and not as powerful as some of the other Forerunner weapons employed against the Flood.{{Ref/Reuse|SI}}{{Ref/Reuse|QZ}} Because of their limited ancilla, they are only individually able to handle situations on a basic scale, which makes them vulnerable to strategic Flood attacks.{{Ref/Reuse|Enc22p326}} Their limited intelligence means they are often unable to perform evasive maneuvers when facing imminent attack and are usually destroyed.{{Ref/Reuse|SI}}{{Ref/Reuse|QZ}}{{Ref/Reuse|HINF}} In overwhelming numbers, Aggressors are capable of impressive coordination and are more than capable of handling a situation for a certain time until more permanent measures can be applied.{{Ref/Reuse|Enc22p326}}


The Aggressor's energy shield is their primary defense mechanism. Once taken down, it is susceptible to small-arms fire. When an Aggressor has been damaged beyond repair, it explodes violently and releases a powerful [[electromagnetic pulse]], a tactical last resort that disables all nearby electronics.{{Ref/Reuse|SI}}{{Ref/Reuse|QZ}} If all other members of a swarm of Aggressors have been destroyed, the last remaining Aggressors have, on occasion, been observed to overload their core while attempting to ram nearby belligerents.{{Ref/Reuse|HINF}}


'''Sentinels''' are ancient, [[Forerunner]]-constructed [[Wikipedia:robot|robots]]. They possess limited [[Artificial Intelligence]], and are programmed to suppress [[Flood]] outbreaks and protect Forerunner technologies.  
[[File:HW2-Sentinel bombardment.png|thumb|250px|Thousands of Aggressors swarming the ''[[Enduring Conviction]]''.]]
When faced with a single threat of sufficient physical size, such as a [[capital ship]], Aggressors have been known to deploy en masse and create a swarm. Instead of using their individual weapons, they fly in formation and use their bodies as projectiles, causing enough damage to end the threat. This was seen during the [[Second Ark Conflict|conflict]] on [[Installation 00]] in [[2559]], when ''[[Enduring Conviction]]''<nowiki>'</nowiki>s [[energy projector]] was fired upon the surface of the Ark, breaking the installation's outer crust. Thousands of Aggressors on the installation were quick to respond, using their combined mass to tear the ship's hull apart and cut it into two pieces.<ref>'''[[Halo Wars 2]]'''</ref>


==Variants==
*'''Standard Aggressor Sentinel''': Each Forerunner facility has its own unique variation of the standard Aggressor Sentinel, but they all share the same basic structural design and methods of operation.{{Ref/Reuse|Enc22}}
<gallery>
File:H3-SentinelAggressor.png|A chassis of the Aggressor Sentinel deployed during the [[Battle of Installation 00]] and [[Raid on Installation 08|Installation 08]].
File:HaloWars-SentinelAggressor.png|A chassis of the Aggressor Sentinel used during the [[Battle of Trove]].
File:H4 Sentinel.png|A chassis of the Aggressor Sentinel deployed during the [[Battle of Installation 05]] and [[Battle of Requiem|Requiem]] and the [[Second Ark Conflict]].
File:HINF SentinelCrop.png|A chassis of the Aggressor Sentinel used during the [[Battle for Zeta Halo]].
</gallery>


*'''[[Aggressor Sentinel Eliminator]]''': The Aggressor Sentinel Eliminator functions very similarly to the standard Aggressor Sentinel. However, they are fitted with gold-colored armor and a stronger energy shield. Eliminators are equipped with alternate weapons that can include a more powerful Sentinel Beam that fires blue energy or a Heatwave.{{Ref/Reuse|SI}}{{Ref/Reuse|QZ}}{{Ref/Reuse|HINF}}
<gallery>
File:H2A Gold Sentinel.png|A chassis of Aggressor Sentinel Eliminator deployed during the Flood-outbreak on [[Installation 05]].
File:HINF EliminatorCrop.png|A chassis of Aggressor Sentinel Eliminator deployed during the Battle for Zeta Halo.
</gallery>


== Background ==
==Gameplay==
 
[[File:AggressorSentinelEvolution-RefChart.jpg|thumb|350px|Evolution of the Aggressor Sentinel's design from ''Halo: Combat Evolved'' to ''Halo 4''.]]
Sentinels are essentially hovering drones armed with energy shields, propulsion systems, and energy [[weapons]] called [[Sentinel Beam]]s. They were designed to protect Forerunner technologies, such as the [[Halo Array]], from both outside interference and from the Flood. It is implied that prior to the Forerunners' discovery of the Flood, Sentinels (or a previous model of them) were used as assistants or repair drones; in ''[[Halo 3]]'', simple manipulator arms can be seen on sentinels.  
===Changes from ''Halo: Combat Evolved'' to ''Halo 2''===
* The Aggressor Sentinel received a graphical update.
* There are now unshielded Aggressor Sentinels  
* There are now two variants of Aggressor Sentinel: The standard grayish-silver and gold variants.
* The Aggressor Sentinel's [[Sentinel beam|beam weapon]] can now be used when the Sentinel is destroyed.


===Changes from ''Halo 2'' to ''Halo 3''===
* There is now only one variant of Sentinel: the standard grayish-silver type.
* The Sentinel now sports a blue "eye" and teal lights.


The mechanical nature of the Sentinels made them ideal combat units against the Flood, an enemy that could convert conventional biological infantry into biomass - by deploying the Sentinels en mass, the Forerunners could battle the parasite without contributing to its numbers. Sentinels would later serve as basic repair, maintenance and security drones for Forerunner installations and facilities where the Flood was kept, under the jurisdiction of local Monitors, working in conjunction with nearby [[Constructors]] and [[Enforcers]]. The Covenant regard Sentinels and other constructs left behind by the Forerunners as "Holy Warriors of the Sacred Rings," indicating that they have previously encountered Sentinels before they discovered the first Halo rings.
===Changes from ''Halo 3'' to ''Halo 4''===
* Sentinels have undergone a moderate visual redesign, now sporting a more rounded carapace.
* Sentinels now make a much less shrill whirring sound while flying.
* Sentinels now fire a bluish-colored beam, similar to the beam of the golden Sentinel of ''Halo 2'', instead of an orange beam.
* Sentinels will no longer explode when destroyed; instead they teleport away after sustaining severe damage. Because of this behavior, combined with the lack of the weapon's appearance in the game, the Sentinel beam cannot be obtained in ''Halo 4''.


== Functions ==
===Changes from ''Halo 4'' to ''Halo Infinite''===
* Sentinels are more expressive in their muteness and will tilt and move their arms in various situations.
* The [[Aggressor Sentinel Eliminator]] from ''Halo 2'' returns, this time equipped with a Heatwave instead of the Gold Sentinel Beam.
* Sentinels will now melee with their arms if an enemy gets too close.
* The last sentinel in a group will often overload with a loud sound and then charge the enemy, exploding.
* Sentinels are weak to shock weapons and take more damage when shot in their eye.
* Sentinels are not hostile to [[Banished]] forces and can be seen collaborating with them.


===''Halo Wars''===
[[File:1216051911 Sentinel.jpg|thumb|left|260px|The unique shielding that protects Sentinels as seen on [[The Ark]].]]
*'''Info''': A flying Forerunner unit, the Sentinel will inflict corrosive damage with a dangerous beam weapon.
**'''Cost:''' Population 1, Tech level 1, Supplies 100
Aggressors appear in both campaign and Skirmish mode of ''Halo Wars'', serving as an air unit. In campaign, Aggressors are the primary Forerunner unit, appearing on levels set within [[Trove]]. Like all Forerunner units, they are hostile towards all three other factions, including UNSC, Covenant, and the Flood. They are produced from invisible spawn points that could not be targetted or destroyed.


Sentinels, at one point, operated automated facilities, such as [[Threshold]]'s [[Gas Mine]], for "untold centuries". Evidence of this remains; some Sentinels have been seen repairing [[Covenant]] vessels<ref>On the level [[The Arbiter (Level)|The Arbiter]], as the player enters the main hangar with the [[Seraph]] fighter, a Sentinel fires a green beam at the Seraph -- the same beam as the ones used by [[Constructor]]s in [[Sacred Icon (Level)|Sacred Icon]]. This would seem to indicate that some Sentinels serve as repair drones as well.</ref>, and others have been seen carrying [[Gas Container]]s.  
In Skirmish mode, neutral Aggressors are seen defending [[Forerunner fort]]s, which occupied base build sites, and bonus buildings such as the [[Forerunner supply elevator]] or [[Forerunner secondary reactor]]. Player-aligned Aggressors are only found on Skirmish maps [[Repository]] and [[Glacial Ravine]]. These two maps feature [[Sentinel factory|Sentinel factories]], where players can purchase Aggressors which can then be added to their forces.


===''Halo Wars 2'' Open Beta===
These units will defend the [[Domination Point]] in [[Domination]].


Combat-enabled Sentinels are the protectors of the [[Halo Installations]]. Under the command of the local Monitor, Sentinels serving on an installation are used to contain small outbreaks of the Flood. However, they can only manage the Flood for a short time.<ref>''[[Halo Combat Evolved]]'', ''The Library''.</ref> Should an outbreak grow beyond the Sentinels' ability to control it, [[Enforcers]] and shielded [[Sentinel Major]]s are activated by the local Monitor to assist the Sentinels.
===''Halo Wars 2''===
 
Aggressors Sentinel are normally a hostile unit, but [[Professor Anders]]' upgrade for the Protector Sentinel allows Aggressor Sentinels to be its escort. Aggressors have a smaller version known as the Sentinel Swarm, which is impervious to most attacks, except when struck by an EMP MAC or the Aggressor Sentinel coordinating it is destroyed.<ref>'''Halo Wars 2''', Campaign level ''[[The Cartographer]]''</ref><ref>'''Halo Wars 2''', Campaign level ''[[Gatecrashers]]''</ref> On the skirmish map, a group of three Aggressors can be seen guarding a Power Node and it has the ability to de-capture the Power Node should anyone takes control of it while the Aggressors is around. In Skirmish, Professor Anders can utilize her leader power '''Ark Defense''' and '''Sentinel Beacon''' to spawn the Aggressors Sentinel to draw the anti-air's attention.
 
Sentinels have also been seen on the [[Ark]] and on [[Onyx]]; the Sentinels at the latter location [[Onyx Sentinels|appear to have been augmented]].
 
== Combat ==
 
[[Image:Sentinel Firing.jpg|thumb|right|300px|A Sentinel firing its [[Sentinel Beam|weapon]].]]
 
 
The drones are equipped with a plasma-based energy weapon called a [[Sentinel Beam]], which they fire in a sweeping motion. When not engaged in combat, Sentinels contract into smaller forms, concealing their weapon. When a Sentinel is destroyed, its weapon may still be usable<ref>''[[Halo 2]]'' and ''[[Halo 3]]'' only. ''[[Halo: Combat Evolved]]'' requres [[modding]].</ref>; any foot soldier can pick the beam up and fire it manually.
 
 
Plasma weapons are very effective against Sentinels. When a Sentinel is destroyed through any means, it explodes, and the blast can deplete energy shields and [[Jackal]] arm shields, stun nearby Sentinels, cause [[Grunts]] and Jackals to panic, and kill unshielded [[Elites]] and [[SPARTAN-II]]s.
 
 
In ''[[Halo: Combat Evolved]]'', Sentinels will give off sparks for several seconds if they take serious damage. Also, if a Sentinel gets hit by a [[Flood]] [[Combat Form]], it makes a metal clang noise, does not take damage, but will react to the force of the Flood's jump. When a Sentinel is destroyed (in [[Halo 2|''Halo 2'']] or later) it explodes and releases an EMP blast which will completely drain a player's shields if they are too close.
 
== Appearances ==
 
First appearing in ''Halo: Combat Evolved'', Sentinels have only been seen in the [[Halo Trilogy]]'s [[Campaign]]s and in ''[[Halo Wars]]''. In ''Halo 2'', the Sentinels' weapons became usable by the player, and they remained usable in ''Halo 3''. A non-canonical [[Needler Sentinel]] was also left in ''Halo 2''. In ''Halo Wars'', Sentinels serve as backup units; once the player controls a [[Sentinel Factory]], Sentinels will start following the player's orders until the shop is destroyed or captured by the enemy.
 
 
 
== Weaknesses ==
 
Sentinels fare poorly against [[Covenant]] plasma weapons, specifically the [[Plasma Pistol]]. The Plasma Pistol's semi-homing ability is fatal against Sentinels, as one overcharged shot can destroy a Sentinel. The Sentinel is also weak against its own [[Sentinel Beam]]. It can be surmised that these weaknesses are due to the nature of their weaponry and structure; the Sentinel constructs were built primarily as a means to control the Flood, not as a means to combat Human or Covenant weaponry. With this in mind, a few shots from the [[Plasma Rifle]], Needler and [[Covenant Carbine]] can eliminate a Sentinel, as can other rapid-firing weapons such as the [[SMG]] and [[Assault Rifle]]. A [[Battle Rifle]] performs well against Sentinels as well.
 
 
Players can also quickly disable a Sentinel with a [[melee]] attack to the front, which will cause it to spin out of control and explode. As the Flood are very capable of melee fighting, the Sentinels are unusually weak in this regard, considering their primary function is theorized to be the effective combating of Flood outbreaks. Even a nearby explosion from a [[Brute Shot]], [[grenade]], or anything stronger can destroy a Sentinel easily.


==Trivia==
==Trivia==
{{Linkbox|gallery=yes}}
*Chris Hughes created the original concept art of the Aggressor Sentinel.<ref>'''[[The Art of Halo]]''', ''page 44''</ref>
*Aggressor Sentinels share both similar design and functions to that of the P'fhor Defense Drones from the [[Marathon|''Marathon'' series]]. In addition, they share the same weaknesses against shotgun and plasma/fusion pistol fire.
*A [[Needler Sentinel|lone Aggressor Sentinel]] that fires sporadic [[Type-33 Guided Munitions Launcher|Needler]] rounds can be found on the ''Halo 2'' campaign level, ''[[Quarantine Zone]]''. The Aggressor will drop a Needler when destroyed. This is the result of developer experimentation with giving Sentinels different weapons.
*On certain levels in ''Halo 3'', it is possible to 'surf' on Aggressor Sentinels, by standing on the furthest possible point from the front of the Aggressor. This is easiest on ''[[The Ark (level)|The Ark]]'', at the point where the light bridge must be opened for the Scorpions and Warthogs. The Aggressor will, eventually, hover over the edge, holding the player up about half of the time. Remaining on top of the Aggressor allows the player to reach inaccessible locations.


==Gallery==
===Concept art===
<gallery>
File:HCE Sentinel Concept 1.png|Early concept art of Sentinels in ''[[Halo: Combat Evolved]]''.
File:HCE Sentinel Concept 2.png|Another early concept of Sentinels in ''Halo: Combat Evolved''.
File:H4-Concept-Sentinel-Variants.jpg|Conceptual explorations of an Aggressor Sentinel in ''[[Halo 4]]''.
File:HINF Concept SleepyBois.jpg|Pre-production concept art for ''[[Halo Infinite]]'' depicting a large number of inactive Aggressor Sentinels.
File:HINF Concept CavalryHasArrived.jpg|Early ''Halo Infinite'' concept art showing [[Marine]]s fighting through Aggressor Sentinels to reach [[John-117]].
File:HINF Concept SentinelSwarms.jpg|Early ''Halo Infinite'' concept art depicting John-117 observing swarms of Aggressor Sentinels on Installation 07.
File:HINF Concept SentinelCorridor.jpg|Concept art of an Aggressor Sentinel navigating a corridor.
File:HINF-Concept-Aggressor2.jpg|Concept art of Aggressor Sentinels in ''Halo Infinite''.
File:HINF-Concept-Aggressor1.jpg|More concept art of Aggressors in ''Halo Infinite''.
File:HINF Concept Zeta Halo Damaged with Sentinels.jpg|Concept art of Aggressors in space around Installation 07.
File:HINF SentinelRepairServiceConcept.jpg|Concept art of Aggressors moving to repair Installation 07 in ''Halo Infinite''.
File:HINF Concept SentinelLumberjacks.jpg|Concept art of Aggressor Sentinels clearing fallen trees.
File:HINF Concept SentinelFishing.jpg|Concept art of Aggressor Sentinels patrolling a river.
</gallery>


===Artworks===
<gallery>
File:Halo Escalation 21.jpg|Aggressor Sentinels on the cover of ''[[Halo: Escalation]] [[Halo: Escalation Issue 21|#21]]''.
</gallery>


===Renders===
<gallery>
File:HCE-SentinelAggressor.png|A Sentinel in ''Halo: Combat Evolved''.
File:H2-SentinelAggressor.png|A Sentinel in ''[[Halo 2]]''.
File:Sentinel-OrthoSchem-scantransparent.png|An overview of the Aggressor Sentinel in ''[[Halo 3]]''.
File:H4-Render-AggressorSentinel.jpg|Render of an Aggressor Sentinel in ''Halo 4''.
File:H4-AggressorSentinel-ScanRender.png|Render of an Aggressor Sentinel in ''Halo 4''.
File:HINF-AggressorSilverRender1.jpg|Render of an Aggressor Sentinel in ''Halo Infinite''.
File:HINF-AggressorSilverRender2.jpg|Render of an Aggressor Sentinel with its eyes lit up in ''Halo Infinite''.
</gallery>


 
===Screenshots===
[[Image:POAEngineRoom.jpg|thumb|right|200px|Sentinels fighting the [[Flood]].]]
 
[[Image:Sentinel.jpg|200px|thumb|right|A Sentinel in ''[[Halo: Combat Evolved]]''.]]
 
*You can "[[Assassination|assassinate]]" Sentinels. The easiest way to do this is on [[The Maw (Level)|The Maw]], at the beginning of the level when you hide in the hall right to the lifeboat airlock. If you wait for a while, four Sentinels will float in, facing the other way, and you can melee them from behind.
 
*In ''Halo: Combat Evolved'' the Sentinels can be rammed and destroyed with a vehicle (specifically a [[Type-26 Ground Support Aircraft|Banshee]]). This tactic becomes more difficult at higher difficulties as the Sentinels are better able to dodge and inflict damage on the oncoming vehicle. The easiest place to do this is outside the final [[Phase Pulse Generator|pulse generator]] on [[Two Betrayals (Level)|Two Betrayals]].
 
*In ''[[Halo: Ghosts of Onyx|Ghosts of Onyx]]'', an [[Onyx Sentinel]] approaches [[Ash-G099|Ash]], one of Kurt's [[Spartan-IIIs]], and attempts to communicate with him, first in Latin, then in English. Later in the book, Dr. Halsey confirms that this drone was a Sentinel, therefore proving that the Sentinels of [[Onyx]] have a slightly more advanced [[AI]] than those of any other Installations (besides [[Monitors]]).
 
*Of interesting note, the [[Bestiarum]], which is taken from a Forerunner perspective, gives species' names in Latin as well. So a Sentinel speaking Latin could show some sort of link between the [[Forerunner]]s and the Latin language.
 
*There is a lone [[Needler Sentinel]] found on the level ''[[Quarantine_Zone (Level)|Quarantine Zone]]''. It fires sporadic [[Needler]] rounds and drops a Needler when destroyed. The Sentinel is non-canonical and is a development leftover.
 
*[[Chris Hughes]] created a crablike machine with many animating parts that gave the Sentinel life and character.{{Verify_source}}
 
*It is possible to 'stick' a Sentinel with a [[Fragmentation Grenade]]. The Sentinels' in-game model is essentially hollow, so a well-thrown Frag can get stuck inside. This is easiest from in front and just above the target.
 
*In ''Halo: Combat Evolved'', Sentinels would fold into a compact "idle" form while not in combat. In ''Halo 3'', they will fold into this form and clatter to the floor when hit with small impacts, such as brushing against a passing vehicle.
 
*Like other allies, Sentinels will turn on you if you destroy three or more of them. [[343 Guilty Spark (Monitor)|343 Guilty Spark]] will also say some of the lines usually reserved for when you're dead.<ref>''[[Halo: Combat Evolved]]'', [[The Library (Level)|The Library]] </ref>
*You can see Sentinels in the ''Halo 3'' maps [[Construct (Level)|Construct]] and [[Isolation]]. Similar to the fish and birds seen in other multiplayer maps, you can shoot down Sentinels using long range weapons. These Sentinels turn players' [[reticule]]s red. When playing the Juggernaut game type, if the Allied Against Juggernaut option is enabled, then the Sentinels will be allies.
 
*Normal shielded Sentinels (like the ones on the Ark, at the bridge you must activate) have relatively weak shields, as it only takes three-five shots with the [[Carbine]] to penetrate their shield and destroy them.
 
*On certain levels in Halo 3, it is possible to&nbsp;'surf'&nbsp;on&nbsp;Sentinels, by standing on the furthest possible point from the front of the Sentinel. This is easiest on The Ark, at the point where the light bridge must be&nbsp;opened for the Scorpions and Warthogs. Standing&nbsp;on top of one of the Sentinel Boxes (the white boxes either&nbsp;side of the terminal) allows you to walk out on to a Sentinel. The&nbsp;Sentinel will, eventually,&nbsp;hover over the edge,&nbsp;holding you up&nbsp;50% of the time. Remaining on top of the&nbsp;Sentinel&nbsp;allows you to reach unaccessible locations, but&nbsp;you can only land on the vehicles, not drive them as it kills&nbsp;you. The turrets&nbsp;are usable though.&nbsp;
 
*The Bubble Shield, created by the ONI, shares many similarities to that of the shielding technology of the Sentinel, especially that of the [[Onyx Sentinel|model]] used at [[Onyx]].
 
*Sentinels can be seen combating [[Covenant]] troops on the Ark, prior to clearing the LZ for ''[[Forward Unto Dawn]]''. The fight can be seen at the entrance where you flip the switch to let the Scorpions and Warthogs cross the light bridge.
 
*The [[Forerunners]] referred to the Sentinels as "''our very basic countermeasures.''"
 
*For a short period in ''[[Halo 3]]'', Sentinels are the player's allies again (a result of the [[Master Chief]] being reunited with 343 Guilty Spark). However, Guilty Spark only had command of the Sentinels on [[Installation 04]], it is hinted that the Sentinels on the [[Ark]] are either controlled or influenced by [[Mendicant Bias]], via several implicating messages on the terminals found on the Ark. The Sentinels on the replacement Installation 04 are most likely controlled by Guilty Spark. Since Guilty Spark was destroyed, all Sentinels on the replacement [[Installation 04 (II)|Installation 04]] became hostile to anything on it. Another possibility is that Guilty Spark added the [[Master Chief]] and the [[Arbiter (Character)|Arbiter]] to the Sentinels targeting ledger.
 
*It is unknown why the Onyx Sentinels are so much more powerful than those found on the Halo Installations. Perhaps for game play reasons, Bungie probably didn't want the player to be playing hide and seek with Sentinels for most of the game. Another reason would be because of the importance of the Onyx Shield World, since it would, according to plan, be harboring millions of lives, they most likely designed the Onyx Sentinels to be more powerful and damage resilient than those found on the Halo Array because, if the Flood somehow survived, the Forerunners would be in dire need of extra protection.
 
*There are two known types or 'ranks' of the regular Sentinel, one being with an energy shield, the other being without.
 
*In ''Halo Wars'', Sentinels can be produced to fight for you in the map [[Repository]].
 
*Sentinels share both similar design and functions to that of the P'fhor Defense Drones from the [[Marathon (Video Game Series)]]. In addition, they share the same weaknesses of being unable to withstand [[Shotgun]] and [[Plasma Pistol]]/Fusion Pistol fire.
 
*You can cause the message 'Hold RB to take Sentinel Beam' to appear on the ''Halo 3'' level ''The Covenant''. Play normally until the Arbiter has killed Truth then pick up a Plasma Pistol. Then, instead of going through the door back to the second bridge, grenade jump or hammer jump onto the roof of the structure. You should see Sentinels at the second bridge, only they will not attack the Flood; they will float in the air, idle. Kill the Flood combat forms for them. Now there will be a Sentinel floating above the bridge. Overcharge the Plasma Pistol, aim at the Sentinel, and release. This will bring the Sentinel to ground level and the message 'Hold RB to take Sentinel Beam' will appear when you approach it. Note that approaching the Sentinel while carrying a Sentinel Beam will result in no message being displayed. This seems to indicate that Bungie planned to allow the player, the Chief, to exchange weapons with a Sentinel in Halo 3. This may indicate that the Needler Sentinel of Halo 2 was not necessarily a dropped concept.
*It is possible to surf sentinels in Halo 2 as well. This is best done in the level Sacred Icon as they are in enclosed areas and they will spawn forever but they seem to realize you are on them and will soon fly under a ledge to dislodge you.
*A Halo 2 Sentinel will blow up with a devastating EMP pulse that will completely obliderate your shields instantly if they are stuck with a grenade, subjected to any explosive such as fuel rod or rocket, hit with a sniper/beam rifle and, on occasions, melees or a slash with a sword. However, on the plus side, it only works if your close enough it will also take out any other shields in the vicinity and other Sentinels caught in the blast radius will be rendered stunned and easy pickings for plasma weaponry.<ref>[http://www.youtube.com/watch?v=4CSlCHCLDFw Halo 3 - Lazy Sentinels]</ref>
 
== Gallery ==
 
<gallery>
<gallery>
File:SilverSentinal02.jpg|A pair of ''Sentinels'' in ''[[Halo 2]]''.
File:HCE TheMaw EngineRoomChaos.jpg|Sentinels fighting the Flood in ''Halo: Combat Evolved''.
File:SilverSentinal01.jpg|Another Halo 2 Sentinel.
File:SilverSentinel02.jpg|A pair of Aggressors during the [[Battle of Installation 05]] in ''Halo 2''.
File:Sentinalshield.jpg|A ''Sentinel's'' shielding from ''[[Halo PC]]''.
File:H2-SentinelAggressor-Gold.png|The gold variant of the Aggressor Sentinel as seen in ''Halo 2''.
File:Sentinal.jpg|Sentinels in ''[[Halo 3]].''
File:Sentinol.jpg|A basic overview of the Aggressor in ''[[Halo 3]]''.
File:1212706515 Idle Sentinel.jpg|A ''[[Halo 3]]'' Sentinel in its folded-up "idle" form.
File:SentinelFight-large.jpg|Sentinels fighting against the [[Covenant]].
File:1218128875 SentinelDestroyed.jpg|A destroyed Sentinel, ''[[Halo 2]]'' era.
File:H3 Sentinel Shielding 2.jpg|A Sentinel's energy shield in ''Halo 3''.
File:Sentinol.jpg|A Halo 3 Sentinel.
File:H3 SentinelFiring.jpg|A Sentinel Aggressor firing its beam.
File:Covenant Sentinels.jpg| Two Sentinels in [[Halo Wars]] under Covenant control.
File:H3 IdleSentinel.jpg|An Aggressor in its folded-up "idle" form.
File:Sentinel wars.jpg|A UNSC Sentinel in Halo Wars
File:PriorityTask-large-crop.jpg|Several squadrons of Sentinels head out to deal with the Flood.
File:DJC-Sentinel.jpg|A ''Halo 3'' Sentinel on [[Isolation]].
File:3Way2-large.jpg|Aggressor Sentinels firing their Sentinel beam weapons on several attacking Flood combat forms.
File:Sentinel_Closeup.jpg|A close up of a Sentinel, circa Halo 2
File:HTMCC-H3ODST-Sentinels.png|Aggressor Sentinels in the ''[[Halo: The Master Chief Collection]]'' version of ''[[Halo 3: ODST]]'' [[Firefight]].
</gallery>
File:HW SentinelAggressor.png|An Aggressor Sentinel in ''[[Halo Wars]]''.
 
File:HW SentinelAggressorFiring.png|An Aggressor Sentinel firing its weapon in ''[[Halo Wars]]''.
 
File:Halo4-CarbineScope-SentinelAttack.jpg|Sentinels attacking a [[Mgalekgolo|Hunter]], as seen through the scope of a {{Pattern|Mosa|carbine}} wielded by John-117.
==Related Pages==
File:HTMCC-H4 AggressorSentinels 1.png|A trio of Aggressors in ''Halo 4'' ''[[Spartan Ops]]''.
 
File:HTMCC-H4 AggressorsVsKnight 1.png|Multiple Sentinels firing their weapons at a [[Promethean Knight]] in ''Halo 4'' ''Spartan Ops''.
*[[Sentinel Beam]]  
File:H2A Silver sent.png|An Aggressor Sentinel in ''Halo 2: Anniversary''.
 
File:H2A Aggressor.png|A side view of the Sentinel in ''Halo 2: Anniversary''.
*[[Sentinel Launcher]]
File:H2A SentinelBois.png|Two Aggressors alongside a Constructor in ''Halo 2: Anniversary''.
 
File:HW2B Sentinel.png|A Sentinel in the ''[[Halo Wars 2 Open Beta]]''.
*[[Enforcer]]  
File:HW2-Sentinels.png|Sentinels within Installation 00 in ''[[Halo Wars 2]]''.
 
File:HW2-sentinels.jpg|A swarm of Aggressors in formation in ''Halo Wars 2''.
*[[Sentinel Major]]  
File:HINF Founation Sentinels.png|Aggressors in a subterranean Forerunner facility in ''Halo Infinite''.
 
File:HINF sentinels.png|Some Aggressors patrolling on Installation 07 in ''Halo Infinite''.
*[[Onyx Sentinel]]
File:HINF Aggressor Angled.png|A Sentinel Aggressor on the surface of Installation 07 in ''Halo Infinite''.
 
File:HINF Aggressor Beam.png|A Sentinel Aggressor firing its beam weapon in ''Halo Infinite''.
*[[Constructor]]
File:HINF SentinelScan.png|Aggressors scanning the wreckage of a {{Class|Mulsanne|light frigate}} in ''Halo Infinite''.
 
File:HINF Sentinel Scan.png|An Aggressor using its scanner in ''Halo Infinite''.
*[[Sentinel Production Facility]]
File:HINF Sentinel Shield.png|An Aggressor with its energy shield in ''Halo Infinite''.
 
File:HINF AggressorSelfDestruct.png|An Aggressor prepares to self-destruct in ''Halo Infinite''.
*[[Sentinel Shop]]
File:HINF CrashedAggressorSentinel.png|A crashed Aggressor on Installation 07 in ''Halo Infinite'' campaign.
 
File:HINF CrashedAggressorSentinel Fragmentation.png|A crashed Aggressor on Installation 07 in ''Halo Infinite'' map [[Fragmentation]].
*[[Needler Sentinel]]
</gallery>
 
*[[Super Sentinel]]  
 
== References ==


<references/>
== List of appearances ==
{{Col-begin}}
{{Col-2}}
*''[[Halo: Combat Evolved]]'' {{1st}}
*''[[Halo: The Flood]]''
*''[[Halo 2]]''
*''[[Halo: Ghosts of Onyx]]''
*''[[Iris]]''
**''[[Halo 3: The Cradle of Life]]''
*''[[Halo 3]]''
*''[[Halo Wars]]''
*''[[Halo Legends]]''
**''[[Origins]]''
*''[[Halo: Blood Line]]''
*''[[Halo: Cryptum]]''
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
*''[[Halo: Primordium]]''
*''[[Halo 4]]''
**''[[Spartan Ops]]''
{{Col-2}}
*''[[Halo: Silentium]]''
*''[[Halo: Spartan Assault]]''
*''[[Halo: Escalation]]''
*''[[Halo: Broken Circle]]''
*''[[Halo 2: Anniversary]]''
*''[[Halo: Hunters in the Dark]]''
*''[[Halo: Last Light]]''
*''[[Halo Mythos]]''
*''[[Halo: Fractures]]''
**''[[Promises to Keep]]''
*''[[Halo Wars 2]]''
*''[[Halo: Outpost Discovery]]''
*''[[Halo: Divine Wind]]''
*''[[Halo Infinite]]''
*''[[Halo: The Rubicon Protocol]]''
{{Col-end}}


== Sources ==
{{Ref/Sources}}


{{Forerunner|sentinel}}


{{Forerunner}}
[[Category:Sentinels]]
[[Category:The Forerunner]]
[[Category:Technology]]

Latest revision as of 23:03, December 27, 2024

This article is about the standard sentinel introduced in Halo: Combat Evolved. For the golden variant introduced in Halo 2, see Aggressor Sentinel Eliminator.
Aggressor Sentinel
Render of an Aggressor Sentinel from Halo Infinite based on Josh Gregory's works.
Overview

Role:

Length:

2.9 meters (9.6 ft)[2] - 4.1 meters (13.5 ft)[1]

Width:

1.9 meters (6.3 ft)[2] - 2.3 meters (7.4 ft)[1]

Height:

1.5 meters (5 ft)[2] - 2.3 meters (7.6 ft)[1]

Armament:

Sentinel beam (standard)[1]
Heatwave (rarely)[3]

Armor:

Energy shields[1]

 

"Sentinels! The holy warriors of the sacred rings!"
— A Special Operations Sangheili exclaimed upon seeing Aggressor Sentinels in the Threshold gas mine[4]

Aggressor Sentinels[5] (UNSC Z-classification: Z-1500 Automated Systems Drones, Z-1500 ASD)[2] are Forerunner automatons programmed to act as security and maintenance drones, suppress small-scale Flood outbreaks, and protect Forerunner installations. As the basic type of the fairly inclusive Sentinel class, Aggressors are generally referred to simply as Sentinels.[5]

Overview[edit]

John-117 has a face-to-face encounter with an Aggressor Sentinel on Installation 00.

Design details[edit]

Aggressor Sentinels have two arm-like appendages, with two fine manipulators at the end of each arm. Their central head rests above a curved undercarriage generally housing an offensive sterilization beam. Their powerful beam weapons and defensive energy shields make them very effective in combat against intruders or foreign objects that present themselves as threats. Aggressor Sentinels are also equipped with a small reconstitution emitter, which uses lasers to repair damaged Forerunner constructs in conjunction with Constructors and for self-repair should the Aggressors be damaged in combat.[6] Aggressors are propelled by both an anti-gravity unit located on the undercarriage and small, exotic form of impulse drive which enables them to travel at high speeds.[2] They are also capable of tapping into their installation's teleportation grid.[2]

There are at least two major variants of the Aggressor Sentinel. The standard model is gray or silver in color while the specialized Aggressor Sentinel Eliminator is golden. The differences between the two variants lie solely on their offensive and defensive systems, with the Eliminator sporting superior weaponry and shielding systems.[7][8][3]

Aggressors are created at specialized manufacturing facilities located on every Halo installation and on other key Forerunner installations.[6] These facilities can consist of large airborne platforms or subterranean factories where Aggressors are birthed in nanomachine vats and programmed to serve.[8][9][10] Each Forerunner installation has its own design of the Aggressor Sentinel, but they all share the same basic structure and purpose.[1]

Operation[edit]

An Aggressor Sentinel's energy shield.

Aggressor Sentinels were deployed in massive numbers during the Forerunner-Flood war.[1] Unlike their own biological soldiers that could be converted into biomass, the mechanical nature of the Aggressor Sentinels allowed the Forerunners to battle the Flood without contributing to its numbers.[6] Billions are estimated to be active across the myriad of Forerunner installations where they are utilized as all-purpose workers and guards.[1] Following the construction of the Halo Array, they were installed on the ringworlds as their first line of defense against Flood outbreaks and other external threats. Controlled by their own basic ancilla functions, as well as their installation's monitor, Aggressors patrol the installation's vast terrain and network tunnels tirelessly and attack as their protocol demands.[6]

When not in combat, Aggressors serve as basic repair, maintenance, and security drones for Forerunner installations and facilities where Flood samples are kept, working in conjunction with Constructors and Enforcers to ensure that the facility remains in working order.[7]

The keyship Anodyne Spirit was equipped with its own contingent of Aggressor Sentinels. The San'Shyuum managed to adapt these machines to serve them in a combat support role, using them in battles during the War of Beginnings before the Covenant's formation.[11] The war depleted the keyship's Sentinel contingent almost completely, and the few that remained in High Charity were regarded as relics to be preserved and were no longer used in combat.[12]

Combat behavior[edit]

An Aggressor Sentinel firing its Sentinel beam.
An Aggressor Sentinel firing its sterilization beam.

Aggressor Sentinels are the first automated defense systems to assist a in a given situation and generate a proper response protocol, deploying to an area of interest via wall-mounted emitters.[7][3] While Aggressors are strong enough to handle small-scale battles, they are more of a supplement rather than a reliable combat system. The Aggressors' weapons systems are limited and not as powerful as some of the other Forerunner weapons employed against the Flood.[7][8] Because of their limited ancilla, they are only individually able to handle situations on a basic scale, which makes them vulnerable to strategic Flood attacks.[10] Their limited intelligence means they are often unable to perform evasive maneuvers when facing imminent attack and are usually destroyed.[7][8][3] In overwhelming numbers, Aggressors are capable of impressive coordination and are more than capable of handling a situation for a certain time until more permanent measures can be applied.[10]

The Aggressor's energy shield is their primary defense mechanism. Once taken down, it is susceptible to small-arms fire. When an Aggressor has been damaged beyond repair, it explodes violently and releases a powerful electromagnetic pulse, a tactical last resort that disables all nearby electronics.[7][8] If all other members of a swarm of Aggressors have been destroyed, the last remaining Aggressors have, on occasion, been observed to overload their core while attempting to ram nearby belligerents.[3]

Thousands of Aggressors swarming the Enduring Conviction.

When faced with a single threat of sufficient physical size, such as a capital ship, Aggressors have been known to deploy en masse and create a swarm. Instead of using their individual weapons, they fly in formation and use their bodies as projectiles, causing enough damage to end the threat. This was seen during the conflict on Installation 00 in 2559, when Enduring Conviction's energy projector was fired upon the surface of the Ark, breaking the installation's outer crust. Thousands of Aggressors on the installation were quick to respond, using their combined mass to tear the ship's hull apart and cut it into two pieces.[13]

Variants[edit]

  • Standard Aggressor Sentinel: Each Forerunner facility has its own unique variation of the standard Aggressor Sentinel, but they all share the same basic structural design and methods of operation.[1]
  • Aggressor Sentinel Eliminator: The Aggressor Sentinel Eliminator functions very similarly to the standard Aggressor Sentinel. However, they are fitted with gold-colored armor and a stronger energy shield. Eliminators are equipped with alternate weapons that can include a more powerful Sentinel Beam that fires blue energy or a Heatwave.[7][8][3]
  • A chassis of Aggressor Sentinel Eliminator deployed during the Flood-outbreak on Installation 05.

    A chassis of Aggressor Sentinel Eliminator deployed during the Flood-outbreak on Installation 05.

  • A chassis of Aggressor Sentinel Eliminator deployed during the Battle for Zeta Halo.

    A chassis of Aggressor Sentinel Eliminator deployed during the Battle for Zeta Halo.

Gameplay[edit]

Evolution of the Aggressor Sentinel's design from Halo: Combat Evolved to Halo 4.

Changes from Halo: Combat Evolved to Halo 2[edit]

  • The Aggressor Sentinel received a graphical update.
  • There are now unshielded Aggressor Sentinels
  • There are now two variants of Aggressor Sentinel: The standard grayish-silver and gold variants.
  • The Aggressor Sentinel's beam weapon can now be used when the Sentinel is destroyed.

Changes from Halo 2 to Halo 3[edit]

  • There is now only one variant of Sentinel: the standard grayish-silver type.
  • The Sentinel now sports a blue "eye" and teal lights.

Changes from Halo 3 to Halo 4[edit]

  • Sentinels have undergone a moderate visual redesign, now sporting a more rounded carapace.
  • Sentinels now make a much less shrill whirring sound while flying.
  • Sentinels now fire a bluish-colored beam, similar to the beam of the golden Sentinel of Halo 2, instead of an orange beam.
  • Sentinels will no longer explode when destroyed; instead they teleport away after sustaining severe damage. Because of this behavior, combined with the lack of the weapon's appearance in the game, the Sentinel beam cannot be obtained in Halo 4.

Changes from Halo 4 to Halo Infinite[edit]

  • Sentinels are more expressive in their muteness and will tilt and move their arms in various situations.
  • The Aggressor Sentinel Eliminator from Halo 2 returns, this time equipped with a Heatwave instead of the Gold Sentinel Beam.
  • Sentinels will now melee with their arms if an enemy gets too close.
  • The last sentinel in a group will often overload with a loud sound and then charge the enemy, exploding.
  • Sentinels are weak to shock weapons and take more damage when shot in their eye.
  • Sentinels are not hostile to Banished forces and can be seen collaborating with them.

Halo Wars[edit]

  • Info: A flying Forerunner unit, the Sentinel will inflict corrosive damage with a dangerous beam weapon.
    • Cost: Population 1, Tech level 1, Supplies 100

Aggressors appear in both campaign and Skirmish mode of Halo Wars, serving as an air unit. In campaign, Aggressors are the primary Forerunner unit, appearing on levels set within Trove. Like all Forerunner units, they are hostile towards all three other factions, including UNSC, Covenant, and the Flood. They are produced from invisible spawn points that could not be targetted or destroyed.

In Skirmish mode, neutral Aggressors are seen defending Forerunner forts, which occupied base build sites, and bonus buildings such as the Forerunner supply elevator or Forerunner secondary reactor. Player-aligned Aggressors are only found on Skirmish maps Repository and Glacial Ravine. These two maps feature Sentinel factories, where players can purchase Aggressors which can then be added to their forces.

Halo Wars 2 Open Beta[edit]

These units will defend the Domination Point in Domination.

Halo Wars 2[edit]

Aggressors Sentinel are normally a hostile unit, but Professor Anders' upgrade for the Protector Sentinel allows Aggressor Sentinels to be its escort. Aggressors have a smaller version known as the Sentinel Swarm, which is impervious to most attacks, except when struck by an EMP MAC or the Aggressor Sentinel coordinating it is destroyed.[14][15] On the skirmish map, a group of three Aggressors can be seen guarding a Power Node and it has the ability to de-capture the Power Node should anyone takes control of it while the Aggressors is around. In Skirmish, Professor Anders can utilize her leader power Ark Defense and Sentinel Beacon to spawn the Aggressors Sentinel to draw the anti-air's attention.

Trivia[edit]

Main-Superintendent.png Browse more images in this article's gallery page.
  • Chris Hughes created the original concept art of the Aggressor Sentinel.[16]
  • Aggressor Sentinels share both similar design and functions to that of the P'fhor Defense Drones from the Marathon series. In addition, they share the same weaknesses against shotgun and plasma/fusion pistol fire.
  • A lone Aggressor Sentinel that fires sporadic Needler rounds can be found on the Halo 2 campaign level, Quarantine Zone. The Aggressor will drop a Needler when destroyed. This is the result of developer experimentation with giving Sentinels different weapons.
  • On certain levels in Halo 3, it is possible to 'surf' on Aggressor Sentinels, by standing on the furthest possible point from the front of the Aggressor. This is easiest on The Ark, at the point where the light bridge must be opened for the Scorpions and Warthogs. The Aggressor will, eventually, hover over the edge, holding the player up about half of the time. Remaining on top of the Aggressor allows the player to reach inaccessible locations.

Gallery[edit]

Concept art[edit]

  • Early concept art of Sentinels in Halo: Combat Evolved.

    Early concept art of Sentinels in Halo: Combat Evolved.

  • Another early concept of Sentinels in Halo: Combat Evolved.

    Another early concept of Sentinels in Halo: Combat Evolved.

  • Conceptual explorations of an Aggressor Sentinel in Halo 4.

    Conceptual explorations of an Aggressor Sentinel in Halo 4.

  • Pre-production concept art for Halo Infinite depicting a large number of inactive Aggressor Sentinels.

    Pre-production concept art for Halo Infinite depicting a large number of inactive Aggressor Sentinels.

  • Early Halo Infinite concept art showing Marines fighting through Aggressor Sentinels to reach John-117.

    Early Halo Infinite concept art showing Marines fighting through Aggressor Sentinels to reach John-117.

  • Early Halo Infinite concept art depicting John-117 observing swarms of Aggressor Sentinels on Installation 07.

    Early Halo Infinite concept art depicting John-117 observing swarms of Aggressor Sentinels on Installation 07.

  • Concept art of an Aggressor Sentinel navigating a corridor.

    Concept art of an Aggressor Sentinel navigating a corridor.

  • Concept art of Aggressor Sentinels in Halo Infinite.

    Concept art of Aggressor Sentinels in Halo Infinite.

  • More concept art of Aggressors in Halo Infinite.

    More concept art of Aggressors in Halo Infinite.

  • Concept art of Aggressors in space around Installation 07.

    Concept art of Aggressors in space around Installation 07.

  • Concept art of Aggressors moving to repair Installation 07 in Halo Infinite.

    Concept art of Aggressors moving to repair Installation 07 in Halo Infinite.

  • Concept art of Aggressor Sentinels clearing fallen trees.

    Concept art of Aggressor Sentinels clearing fallen trees.

  • Concept art of Aggressor Sentinels patrolling a river.

    Concept art of Aggressor Sentinels patrolling a river.

Artworks[edit]

Renders[edit]

  • A Sentinel in Halo: Combat Evolved.

    A Sentinel in Halo: Combat Evolved.

  • A Sentinel in Halo 2.

    A Sentinel in Halo 2.

  • An overview of the Aggressor Sentinel in Halo 3.

    An overview of the Aggressor Sentinel in Halo 3.

  • Render of an Aggressor Sentinel in Halo 4.

    Render of an Aggressor Sentinel in Halo 4.

  • Render of an Aggressor Sentinel in Halo 4.

    Render of an Aggressor Sentinel in Halo 4.

  • Render of an Aggressor Sentinel in Halo Infinite.

    Render of an Aggressor Sentinel in Halo Infinite.

  • Render of an Aggressor Sentinel with its eyes lit up in Halo Infinite.

    Render of an Aggressor Sentinel with its eyes lit up in Halo Infinite.

Screenshots[edit]

  • Sentinels fighting the Flood in Halo: Combat Evolved.

    Sentinels fighting the Flood in Halo: Combat Evolved.

  • A pair of Aggressors during the Battle of Installation 05 in Halo 2.

    A pair of Aggressors during the Battle of Installation 05 in Halo 2.

  • The gold variant of the Aggressor Sentinel as seen in Halo 2.

    The gold variant of the Aggressor Sentinel as seen in Halo 2.

  • A basic overview of the Aggressor in Halo 3.

    A basic overview of the Aggressor in Halo 3.

  • Sentinels fighting against the Covenant.

    Sentinels fighting against the Covenant.

  • A Sentinel's energy shield in Halo 3.

    A Sentinel's energy shield in Halo 3.

  • A Sentinel Aggressor firing its beam.

    A Sentinel Aggressor firing its beam.

  • An Aggressor in its folded-up "idle" form.

    An Aggressor in its folded-up "idle" form.

  • Several squadrons of Sentinels head out to deal with the Flood.

    Several squadrons of Sentinels head out to deal with the Flood.

  • Aggressor Sentinels firing their Sentinel beam weapons on several attacking Flood combat forms.

    Aggressor Sentinels firing their Sentinel beam weapons on several attacking Flood combat forms.

  • Aggressor Sentinels in the Halo: The Master Chief Collection version of Halo 3: ODST Firefight.

    Aggressor Sentinels in the Halo: The Master Chief Collection version of Halo 3: ODST Firefight.

  • An Aggressor Sentinel in Halo Wars.

    An Aggressor Sentinel in Halo Wars.

  • An Aggressor Sentinel firing its weapon in Halo Wars.

    An Aggressor Sentinel firing its weapon in Halo Wars.

  • Sentinels attacking a Hunter, as seen through the scope of a Mosa-pattern carbine wielded by John-117.

    Sentinels attacking a Hunter, as seen through the scope of a Mosa-pattern carbine wielded by John-117.

  • A trio of Aggressors in Halo 4 Spartan Ops.

    A trio of Aggressors in Halo 4 Spartan Ops.

  • Multiple Sentinels firing their weapons at a Promethean Knight in Halo 4 Spartan Ops.

    Multiple Sentinels firing their weapons at a Promethean Knight in Halo 4 Spartan Ops.

  • An Aggressor Sentinel in Halo 2: Anniversary.

    An Aggressor Sentinel in Halo 2: Anniversary.

  • A side view of the Sentinel in Halo 2: Anniversary.

    A side view of the Sentinel in Halo 2: Anniversary.

  • Two Aggressors alongside a Constructor in Halo 2: Anniversary.

    Two Aggressors alongside a Constructor in Halo 2: Anniversary.

  • A Sentinel in the Halo Wars 2 Open Beta.

    A Sentinel in the Halo Wars 2 Open Beta.

  • Sentinels within Installation 00 in Halo Wars 2.

    Sentinels within Installation 00 in Halo Wars 2.

  • A swarm of Aggressors in formation in Halo Wars 2.

    A swarm of Aggressors in formation in Halo Wars 2.

  • Aggressors in a subterranean Forerunner facility in Halo Infinite.

    Aggressors in a subterranean Forerunner facility in Halo Infinite.

  • Some Aggressors patrolling on Installation 07 in Halo Infinite.

    Some Aggressors patrolling on Installation 07 in Halo Infinite.

  • A Sentinel Aggressor on the surface of Installation 07 in Halo Infinite.

    A Sentinel Aggressor on the surface of Installation 07 in Halo Infinite.

  • A Sentinel Aggressor firing its beam weapon in Halo Infinite.

    A Sentinel Aggressor firing its beam weapon in Halo Infinite.

  • Aggressors scanning the wreckage of a Mulsanne-class light frigate in Halo Infinite.

    Aggressors scanning the wreckage of a Mulsanne-class light frigate in Halo Infinite.

  • An Aggressor using its scanner in Halo Infinite.

    An Aggressor using its scanner in Halo Infinite.

  • An Aggressor with its energy shield in Halo Infinite.

    An Aggressor with its energy shield in Halo Infinite.

  • An Aggressor prepares to self-destruct in Halo Infinite.

    An Aggressor prepares to self-destruct in Halo Infinite.

  • A crashed Aggressor on Installation 07 in Halo Infinite campaign.

    A crashed Aggressor on Installation 07 in Halo Infinite campaign.

  • A crashed Aggressor on Installation 07 in Halo Infinite map Fragmentation.

    A crashed Aggressor on Installation 07 in Halo Infinite map Fragmentation.

List of appearances[edit]

Sources[edit]

  1. ^ a b c d e f g h i j k l m Halo Encyclopedia (2022 edition), page 327
  2. ^ a b c d e f Halo 4: The Essential Visual Guide, page 133
  3. ^ a b c d e f Halo Infinite
  4. ^ Halo 2, campaign level The Arbiter
  5. ^ a b Halo: The Essential Visual Guide, page 167
  6. ^ a b c d Halo Encyclopedia (2009 edition), "Chapter 8", page 226-227
  7. ^ a b c d e f g Halo 2, campaign level Sacred Icon
  8. ^ a b c d e f Halo 2, campaign level Quarantine Zone
  9. ^ Halo Wars
  10. ^ a b c Halo Encyclopedia (2022 edition), page 326
  11. ^ Halo: Broken Circle, pages 6, 9
  12. ^ Halo: Broken Circle, page 189
  13. ^ Halo Wars 2
  14. ^ Halo Wars 2, Campaign level The Cartographer
  15. ^ Halo Wars 2, Campaign level Gatecrashers
  16. ^ The Art of Halo, page 44

v • d • e
 
The Forerunners
For a complete list, check out our Forerunner category.
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