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{{Era|Forerunner|HCW|Post}}
{{Status|Canon}}{{Status|Featured}}
{{Forerunner Infobox
{{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
|name= Aggressor Sentinel
|image= [[File:H4 Sentinel.png|300px]]
|image= [[File:HINF SentinelCrop.png|300px]]
|role= Combat and defense
|role=*Defense{{Ref/Reuse|Enc22}}
*Maintenance{{Ref/Reuse|Enc22}}
*Offense{{Ref/Reuse|Enc22}}
*Utility{{Ref/Reuse|Enc22}}
|first seen=
|first seen=
|length={{Convert|9.6|ft|m|sp=us|disp=flip}}<ref name="h4evg"/>
|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}}
|width={{Convert|6.3|ft|m|sp=us|disp=flip}}<ref name="h4evg"/>
|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}}
|height={{Convert|5|ft|m|sp=us|disp=flip}}<ref name="h4evg"/>
|height={{Convert|5|ft|m|sp=us|disp=flip}}{{Ref/Reuse|h4evg}} - {{Convert|7.6|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|armament=[[Sentinel beam]]
|armament=[[Sentinel beam]] {{C|standard}}{{Ref/Reuse|Enc22}}<br>
|armor=[[Energy shields]]
[[Heatwave]] {{C|rarely}}{{Ref/Game|Id=HINF|HINF}}
|armor=[[Energy shields]]{{Ref/Reuse|Enc22}}
}}
}}
{{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>}}
{{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>}}
'''Z-1500 Automated Systems Drones''' ('''Z-1500 ASD'''),<ref name="h4evg">'''[[Halo 4: The Essential Visual Guide]]''', ''page 133''</ref> more commonly known as '''Aggressor Sentinels''',<ref name="EVG">'''[[Halo: The Essential Visual Guide]]''', ''page 167''</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 name="EVG"/>
'''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}}


==Design details==
==Overview==
[[File:H2-ThreeSentinelAggressors.png|250px|left|thumb|Three specialized Sentinels, as hinted by their gold chassis.]]
[[File:Halo3-21146876-Full-crop.jpg|250px|left|thumb|[[John-117]] has a face-to-face encounter with an Aggressor Sentinel on [[Installation 00]].]]
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 housing an offensive [[Sentinel 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. Their smaller lasers are used for both repairing damaged Forerunner constructs in conjunction with [[Constructor]]s, and self-repair should the Aggressors be damaged in combat.<ref name="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 name="h4evg"/> They are also capable of tapping into their installation's [[teleportation grid]].<ref name="h4evg"/>
===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 variants of the Aggressor Sentinel; the most common model is grayish white in color while the specialized model is golden. The differences between the two variants lie solely on their offensive and defensive systems; the gold-colored version sports superior weaponry and shielding system to the common grayish-white model's.
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]],<ref name="encyclopedia"/> massive airborne platforms that are located on every Halo installation and on other key Forerunner installations such as [[shield world]]s. These compounds produce Sentinels when facing either a Flood outbreak or an external threat to their local installation. The massive assembly lines, at maximum performance, can produce Sentinels at a very fast rate to either supplement existing Forerunner defenses or to replace those destroyed for whatever reason.
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===
===Operation===
[[File:H3_Sentinel_Shielding.jpg|thumb|right|250px|A Sentinel's energy shield.]]
[[File:H3 Sentinel Shielding.jpg|thumb|250px|An Aggressor Sentinel's energy shield.]]
Aggressors were utilized as all-purpose workers and guards on Forerunner stations. Following the construction of the [[Halo Array]], they were reconfigured to be the first line of defense against Flood outbreaks and other external intruders. The mechanical nature of the Aggressors make them ideal combat units against an enemy that could convert conventional biological infantry into biomass - by deploying the Aggressors en masse, the Forerunners could battle the parasite without contributing to its numbers. Controlled by their own basic AI 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]]''', "Chapter 8", ''page 226-227''</ref>
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.
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 [[Forerunner Dreadnought]], the [[San'Shyuum]]'s [[keyship]], was equipped with its own contingent of Sentinels. The San'Shyuum managed to adapt these machines to serve them in a combat support role. Aggressors under San'Shyuum control were used in battles during the [[War of Beginnings]] before the [[Covenant]]'s formation.<ref>'''Halo: Broken Circle''', ''pages 6, 9''</ref> The war depleted the Sentinels' numbers 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>
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===
===Combat behavior===
[[File:HW2-Sentinel bombardment.png|thumb|250px|left|Aggressors swarming the ''[[Enduring Conviction]]''.]]
[[File:H2A FirinMahLazer.png|thumb|225px|left|An Aggressor Sentinel firing its sterilization beam.]]
Aggressors are the first Forerunner automated defense systems to assist a situation and generate a proper response protocol. 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, and can only hold them at bay for a limited amount of time.  
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 launcher|wall-mounted launchers]].{{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}}


Because of their limited AI, they are only individually able to handle situations on a basic scale, which makes them vulnerable to strategic Flood attacks. Because of their limited intelligence they are not often able to perform evasive maneuvers when facing imminent attack and are usually destroyed. 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.
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}}
 
The Aggressor's energy shield is their primary defense mechanism. Once taken down, it is susceptible to any type of 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.


[[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>
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==
==Variants==
*'''Gold variant''': This variant acts just like an average shielded Aggressor Sentinel, but has more durable armor, faster recharging shields and utilizes a stronger blue Sentinel Beam. This variant was deployed during the Flood-outbreak on [[Installation 05]].
*'''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>
<gallery>
File:H2A Gold Sentinel.png|Gold variant
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>
</gallery>


==Gameplay==
==Gameplay==
[[File:AggressorSentinelEvolution-RefChart.jpg|thumb|350px|Evolution of the Aggressor Sentinel's design throughout the ''Halo'' games.]]
[[File:AggressorSentinelEvolution-RefChart.jpg|thumb|350px|Evolution of the Aggressor Sentinel's design from ''Halo: Combat Evolved'' to ''Halo 4''.]]
===Changes from ''Halo: Combat Evolved'' to ''Halo 2''===
===Changes from ''Halo: Combat Evolved'' to ''Halo 2''===
* The Aggressor Sentinel received a graphical update.
* The Aggressor Sentinel received a graphical update.
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* There is now only one variant of Sentinel: the standard grayish-silver type.
* There is now only one variant of Sentinel: the standard grayish-silver type.
* The Sentinel now sports a blue "eye" and teal lights.
* The Sentinel now sports a blue "eye" and teal lights.
* All the Sentinels now have shields.


===Changes from ''Halo 3'' to ''Halo 4''===
===Changes from ''Halo 3'' to ''Halo 4''===
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* Sentinels now fire a bluish-colored beam, similar to the beam of the golden Sentinel of ''Halo 2'', instead of an orange beam.
* 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''.
* 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''===
* 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''===
===''Halo Wars''===
*'''Info''': A flying Forerunner unit, the Sentinel will inflict corrosive damage with a dangerous beam weapon.
*'''Info''': A flying Forerunner unit, the Sentinel will inflict corrosive damage with a dangerous beam weapon.
**'''Cost:''' Population 1, Tech level 1, Supplies 100
**'''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 the [[Etran Harborage]]. 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.
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 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 shop]]s, where players can purchase Aggressors which can then be added to their forces.
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===
===''Halo Wars 2'' Open Beta===
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===''Halo Wars 2''===
===''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>
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.


==Trivia==
==Trivia==
{{Linkbox|gallery=yes}}
{{Linkbox|gallery=yes}}
*Chris Hughes created the original concept art of the Sentinel.<ref>'''[[The Art of Halo]]''', ''page 44''</ref>
*Chris Hughes created the original concept art of the Aggressor Sentinel.<ref>'''[[The Art of Halo]]''', ''page 44''</ref>
*A [[Needler Sentinel|lone Aggressor]] that fires sporadic [[Type-33 Guided Munitions Launcher|Needler]] rounds can be found on the ''Halo 2'' campaign level, ''[[Quarantine Zone (level)|Quarantine Zone]]''. The Aggressor will drop a Needler when destroyed. This is the result of developer experimentation with giving Sentinels different weapons.
*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.
*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.
*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.
*In the ''[[Deliver Hope]]'' trailer, the shielding on the Covenant {{Class|CCS|battlecruiser}} appears similar to the energy shields on the Aggressors in ''[[Halo 3]]''.


==Gallery==
==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 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>
<gallery>
File:HCE Sentinel Concept 1.png|Concept art of Sentinels in ''[[Halo: Combat Evolved]]''.
File:HCE Sentinel Concept 2.png|Another concept art of Sentinels in ''Halo: Combat Evolved''.
File:HCE-SentinelAggressor.png|A Sentinel in ''Halo: Combat Evolved''.
File:HCE-SentinelAggressor.png|A Sentinel in ''Halo: Combat Evolved''.
File:HCE_TheMaw_EngineRoomChaos.jpg|Sentinels fighting the Flood in ''Halo: Combat Evolved''.
File:H2-SentinelAggressor.png|A Sentinel in ''[[Halo 2]]''.
File:H2-SentinelAggressor.png|A Sentinel in ''[[Halo 2]]''.
File:Sentinel-OrthoSchem-scantransparent.png|An overview of the Aggressor Sentinel in ''[[Halo Wars]]''.
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===
<gallery>
File:HCE TheMaw EngineRoomChaos.jpg|Sentinels fighting the Flood in ''Halo: Combat Evolved''.
File:SilverSentinel02.jpg|A pair of Aggressors during the [[Battle of Installation 05]] in ''Halo 2''.
File:SilverSentinel02.jpg|A pair of Aggressors during the [[Battle of Installation 05]] in ''Halo 2''.
File:H2-SentinelAggressor-Gold.png|The gold variant of the Aggressor Sentinel as seen in ''Halo 2''.
File:H2-SentinelAggressor-Gold.png|The gold variant of the Aggressor Sentinel as seen in ''Halo 2''.
File:H3-SentinelAggressor.png|An Aggressor Sentinel in ''[[Halo 3]]''.
File:Sentinol.jpg|A basic overview of the Aggressor in ''[[Halo 3]]''.
File:Sentinel-OrthoSchem-scantransparent.png|An overview of the Aggressor Sentinel.
File:Sentinol.jpg|A basic overview of the Aggressor in ''Halo 3''.
File:SentinelFight-large.jpg|Sentinels fighting against the [[Covenant]].
File:SentinelFight-large.jpg|Sentinels fighting against the [[Covenant]].
File:H3_Sentinel_Shielding_2.jpg|A Sentinel's energy shield in ''Halo 3''.
File:H3 Sentinel Shielding 2.jpg|A Sentinel's energy shield in ''Halo 3''.
File:H3_SentinelFiring.jpg|A Sentinel Aggressor firing its beam.
File:H3 SentinelFiring.jpg|A Sentinel Aggressor firing its beam.
File:H3_IdleSentinel.jpg|An Aggressor in its folded-up "idle" form.
File:H3 IdleSentinel.jpg|An Aggressor in its folded-up "idle" form.
File:Halo3-21146876-Full-crop.jpg|[[John-117]] has a face-to-face encounter with a Sentinel on [[Installation 00]].
File:PriorityTask-large-crop.jpg|Several squadrons of Sentinels head out to deal with the Flood.
File:PriorityTask-large-crop.jpg|Several squadrons of Sentinels head out to deal with the Flood.
File:3Way2-large.jpg|Aggressor Sentinels firing their Sentinel beam weapons on several attacking Flood combat forms.
File:3Way2-large.jpg|Aggressor Sentinels firing their Sentinel beam weapons on several attacking Flood combat forms.
File:HaloWars-SentinelAggressor.png|An Aggressor Sentinel in ''[[Halo Wars]]''.
File:HTMCC-H3ODST-Sentinels.png|Aggressor Sentinels in the ''[[Halo: The Master Chief Collection]]'' version of ''[[Halo 3: ODST]]'' [[Firefight]].
File:H4-Concept-Sentinel-Variants.jpg|Conceptual explorations of an Aggressor Sentinel in ''[[Halo 4]]''.
File:HW SentinelAggressor.png|An Aggressor Sentinel in ''[[Halo Wars]]''.
File:H4-Render-AggressorSentinel.jpg|Render of an Aggressor Sentinel in ''Halo 4''.
File:HW SentinelAggressorFiring.png|An Aggressor Sentinel firing its weapon in ''[[Halo Wars]]''.
File:H4-AggressorSentinel-ScanRender.png|Render of an Aggressor Sentinel in ''Halo 4''.
File:Halo4-CarbineScope-SentinelAttack.jpg|Sentinels attacking a [[Mgalekgolo|Hunter]], as seen through the scope of a {{Pattern|Mosa|carbine}} wielded by John-117.
File:Halo4-CarbineScope-SentinelAttack.jpg|Sentinels attacking a [[Mgalekgolo|Hunter]], as seen through the scope of a [[Type-51 carbine]] wielded by [[John-117]].
File:HTMCC-H4 AggressorSentinels 1.png|A trio of Aggressors in ''Halo 4'' ''[[Spartan Ops]]''.
File:Halo Escalation 21.jpg|Aggressor Sentinels on the cover of ''Halo: Escalation #21''.
File:HTMCC-H4 AggressorsVsKnight 1.png|Multiple Sentinels firing their weapons at a [[Promethean Knight]] in ''Halo 4'' ''Spartan Ops''.
File:H2A Silver sent.png|A Sentinel in ''Halo 2: Anniversary''.
File:H2A Silver sent.png|An Aggressor Sentinel in ''Halo 2: Anniversary''.
File:H2A Aggressor.png|A side view of the Sentinel.
File:H2A SentinelBois.png|Two Aggressors alongside a Constructor.
File:HW2B Sentinel.png|A Sentinel in the ''[[Halo Wars 2 Open Beta]]''.
File:HW2B Sentinel.png|A Sentinel in the ''[[Halo Wars 2 Open Beta]]''.
File:HW2-Sentinels.png|Sentinels on Installation 00 in ''[[Halo Wars 2]]''.
File:HW2-Sentinels.png|Sentinels within Installation 00 in ''[[Halo Wars 2]]''.
File:HW2-sentinels.jpg|A swarm of Aggressors in formation.
File:HW2-sentinels.jpg|A swarm of Aggressors in formation.
File:HINF sentinels.png|Some Aggressors patrolling on Installation 07 in ''Halo Infinite''.
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''.
File:HINF Sentinel Shield.png|An Aggressor with its energy shield in ''Halo Infinite''.
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]].
</gallery>
</gallery>


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*''[[Halo: Blood Line]]''
*''[[Halo: Blood Line]]''
*''[[Halo: Cryptum]]''
*''[[Halo: Cryptum]]''
{{Col-2}}
*''[[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]]''
**''[[Spartan Ops]]''
**''[[Spartan Ops]]''
{{Col-2}}
*''[[Halo: Silentium]]''
*''[[Halo: Silentium]]''
*''[[Halo: Spartan Assault]]''
*''[[Halo: Spartan Assault]]''
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*''[[Halo Wars 2]]''
*''[[Halo Wars 2]]''
*''[[Halo: Outpost Discovery]]''
*''[[Halo: Outpost Discovery]]''
*''[[Halo: Divine Wind]]''
*''[[Halo Infinite]]''
*''[[Halo: The Rubicon Protocol]]''
{{Col-end}}
{{Col-end}}


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


{{Forerunner|sentinel}}
{{Forerunner|sentinel}}


[[Category:Sentinels]]
[[Category:Sentinels]]

Latest revision as of 18:22, January 20, 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 launchers.[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 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 Wars.

    An overview of the Aggressor Sentinel in Halo Wars.

  • 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.

    A side view of the Sentinel.

  • Two Aggressors alongside a Constructor.

    Two Aggressors alongside a Constructor.

  • 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.

    A swarm of Aggressors in formation.

  • Some Aggressors patrolling on Installation 07 in Halo Infinite.

    Some Aggressors patrolling on Installation 07 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.

  • 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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