Aggressor Sentinel: Difference between revisions

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Template:Forerunner Infobox Sentinels are ancient, Forerunner-constructed robots. They possess limited Artificial Intelligence, and are programmed to suppress Flood outbreaks and protect Forerunner technologies.

Introduction

Built contemporaneously with the construction of the Halo Array, Sentinels were utilized as all-purpose workers and guards on Forerunner stations. Following the construction of the Halo Installations, Sentinels were reconfigured to be the first line of defense against Flood outbreaks and other external intruders. The mechanical nature of the Sentinels make them ideal combat units against 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. Controlled by their own basic AI functions, as well as their Installation's Monitor, Sentinels patrol the Halo rings tirelessly and attack as their protocol demands.^[1]

When not in combat Sentinels 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. Sentinels are viewed by the Covenant as "Holy Warriors of the Sacred Rings,"^[2] machines meant to be worshiped and respected by all who believe in the path.

Design

Sentinels are grayish white in color and have two arm like appendages with two grapple fixtures at the end of each arm and a central "head," curved undercarriage containing an offensive Sentinel Beam. The form of a Sentinel may differ depending on the situation of their Installation. Their powerful offensive beam weapons and defensive energy shield 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, and self-repair should the Sentinel be damaged in combat.^[3] Sentinel's are propelled by both an anti-gravity unit located on the undercarriage and small engines on the back of the unit, they are capable of traveling at high speeds but cannot sustain long range travel.

Sentinel's are created at Sentinel Production Facilities, these are massive floating platforms that are located on every Halo Installation. These Facilities produce all types of Sentinels when facing either a Flood outbreak or an external threat to a Halo Installation or Construct. These 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. Sentinel Production Facilities are not limited to just the Halo Installations, Production Facilities are located on every Forerunner Construct that relies on Sentinels for guarding, although these facilities are different in appearance and may be either ground or mobile based platforms.

Combat

The Forerunners refer the Sentinels as "our very basic countermeasures," and are the first automated defense systems to assist a situation and generate a proper response protocol. While Sentinels are strong enough to handle a situation they are, however, more of a supplement rather then a reliable combat system. The Sentinels weapons system 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.

Because of their limited A.I, they are only 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 large overwhelming numbers Sentinels are more than capable of handling a situation for a certain time until more permanent measures can be applied.

The Sentinels energy shield is the primary defense mechanism, once taken down the Sentinel is susceptible to any type of small arms fire. When the Sentinel has been damaged beyond repair the Sentinel explodes violently and releases a powerful EMP blast. This EMP blast is a strategic last resort, as the EMP blast will disable any nearby electronics, including any weapons the enemy may be using.

Appearances

First appearing in Halo: Combat Evolved, the Sentinels play a important part in aiding the Master Chief through the Library as he attempts to recover the Activation Index. Once learning of Halo's true purpose the Sentinels become an enemy to the Chief as he attempts to destroy Halo.

In Halo 2, 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 as the Arbiter 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 Constructors in Sacred Icon.

Sentinels in Halo 3 are also seen on the Ark and aids the Chief as he makes his way towards the cartographer After the death of 343 Guilty Spark the Sentinels once again become an enemy. A different variant of Sentinels have also been seen on Onyx; and serve as a shield to protect anything without proper clearance from getting near the Shield World.

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.

Variants

Different variants of the Sentinel have been utilized for different combat roles from and can vary from construct to construct; the following is a list of all known variants of the Sentinel.

Sentinel Major

Sentinel Majors are larger, more powerful Sentinel models used for heavy combat situations. They provide backup for Enforcers in the event of a massive Flood outbreak or attacks on the Halo Installations.

Enforcer

Essentially heavy Sentinels, Enforcers are equipped with a variety of offensive and defensive weaponry, including Heavy Needlers Missile Projectiles, Sentinel Beams, and duel Energy Shields covering both their top and bottom halves. They are designed to handle major Flood outbreaks but are also capable of defending their Halo Installation for external threats.

Onyx Sentinel

Onyx Sentinels both guard and make up the Shield World of Onyx. Despite an appearance similar to other Sentinels, Onyx Sentinels are far more formidable opponents for a variety of reasons.

Trivia

In Ghosts of Onyx, an Onyx Sentinel approaches 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).
There is a lone Needler Sentinel found on the 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.^{[verification needed]}
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.
On certain levels in Halo 3, it is possible to 'surf' on 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 opened for the Scorpions and Warthogs. The Sentinel will, eventually, hover over the edge, holding you up 50% of the time. Remaining on top of the Sentinel allows you to reach inaccessible locations.
The Bubble Shield, created by the ONI, shares many similarities to that of the shielding technology of the Sentinel, especially that of the 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.
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.

Gallery

Sentinel.jpg

A Sentinel in Halo: Combat Evolved.
Sentinalshield.jpg

A Sentinels shielding as seen in Halo: CE.
SilverSentinal02.jpg

A pair of Sentinels in Halo 2.
A Halo 3 Sentinel.
1216051911 Sentinel.jpg

The Sentinels Energy Shield as seen in Halo 3.
1212706515 Idle Sentinel.jpg

A Sentinel in its folded-up "idle" form.
DJC-Sentinel.jpg

A Halo 3 Sentinel on Isolation.
Sentinel Closeup.jpg

A close up of a Sentinel, circa Halo 2
POAEngineRoom.jpg

Sentinels fighting the Flood.

Sources

^ Halo Encyclopedia, Chapter 8 Page 226-227
^ Halo 2 The Arbiter (Level)
^ Halo Encyclopedia, Chapter 8 Page 226-227

[1] Halo Encyclopedia, Chapter 8 Page 226-227

[2] Halo 2 The Arbiter (Level)

[3] Halo Encyclopedia, Chapter 8 Page 226-227

[1]

[2]

[3]

@@ Line 1: / Line 1: @@
 {{Ratings}}
 {{era|H1|H2|H3|HW|TF|GOO|LE|IRIS}}
-{{Cleanup}}
 {{Forerunner Infobox
-|image             = [[Image:Halo Wars Sentinel.jpg|300px]]
+|image             = [[Image:Halo Wars Sentinel.jpg|290px]]
 |name              = Sentinel
-|purpose           = Combating Major [[Flood]] Infestations
+|purpose           = Combat and Defense
 |strength          = Moderate
 |first seen        = September 21 2552
+|      aprox. size = {{Convert|2.48|m|ft}}<ref>http://nikon.bungie.org/misc/sloftus_scalecomparison/?display=Flood</ref>
 |primary           = [[Sentinel Beam]]
 |weaponry strength = Moderate
 |defense           = [[Energy Shields]]
 }}
 '''Sentinels''' are ancient, [[Forerunner]]-constructed [[Wikipedia:robot|robots]]. They possess limited [[Artificial Intelligence]], and are programmed to suppress [[Flood]] outbreaks and protect Forerunner technologies.
+==Introduction==
+Built contemporaneously with the construction of the Halo Array, Sentinels were utilized as all-purpose workers and guards on Forerunner stations. Following the construction of the Halo Installations, Sentinels were reconfigured to be the first line of defense against Flood outbreaks and other external intruders. The mechanical nature of the Sentinels make them ideal combat units against 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. Controlled by their own basic AI functions, as well as their Installation's Monitor, Sentinels patrol the Halo rings tirelessly and attack as their protocol demands.<ref>[[Halo Encyclopedia]], Chapter 8 Page 226-227</ref>
+When not in combat Sentinels 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. Sentinels are viewed by the Covenant as "Holy Warriors of the Sacred Rings,"<ref>Halo 2 [[The Arbiter (Level)]]</ref> machines meant to be worshiped and respected by all who believe in the path.
+===Design===
+Sentinels are grayish white in color and have two arm like appendages with two grapple fixtures at the end of each arm and a central "head," curved undercarriage containing an offensive [[Sentinel Beam]]. The form of a Sentinel may differ depending on the situation of their Installation. Their powerful offensive beam weapons and defensive energy shield 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, and self-repair should the Sentinel be damaged in combat.<ref>[[Halo Encyclopedia]], Chapter 8 Page 226-227</ref> Sentinel's are propelled by both an anti-gravity unit located on the undercarriage and small engines on the back of the unit, they are capable of traveling at high speeds but cannot sustain long range travel.
-== Background ==
+Sentinel's are created at [[Sentinel Constructor Factory|Sentinel Production Facilities]], these are massive floating platforms that are located on every Halo Installation. These Facilities produce all types of Sentinels when facing either a Flood outbreak or an external threat to a Halo Installation or Construct. These 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. Sentinel Production Facilities are not limited to just the Halo Installations, Production Facilities are located on every Forerunner Construct that relies on Sentinels for guarding, although these facilities are different in appearance and may be either ground or mobile based platforms.
-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.
-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.
+===Combat===
+The Forerunners refer the Sentinels as "''our very basic countermeasures,''" and are the first automated defense systems to assist a situation and generate a proper response protocol. While Sentinels are strong enough to handle a situation they are, however, more of a supplement rather then a reliable combat system. The Sentinels weapons system 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.
-== Functions ==
+Because of their limited A.I, they are only 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 large overwhelming numbers Sentinels are more than capable of handling a situation for a certain time until more permanent measures can be applied.
-[[File:1216051911 Sentinel.jpg|thumb|left|260px|The unique shielding that protects Sentinels as seen on [[The Ark]].]]
-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.
-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.
+The Sentinels energy shield is the primary defense mechanism, once taken down the Sentinel is susceptible to any type of small arms fire. When the Sentinel has been damaged beyond repair the Sentinel explodes violently and releases a powerful EMP blast. This EMP blast is a strategic last resort, as the EMP blast will disable any nearby electronics, including any weapons the enemy may be using.
-Sentinels have also been seen on the [[Ark]] and on [[Onyx]]; the Sentinels at the latter location [[Onyx Sentinels|appear to have been augmented]].
+==Appearances==
+First appearing in ''Halo: Combat Evolved'', the Sentinels play a important part in aiding the Master Chief through the [[Library]] as he attempts to recover the [[Activation Index]]. Once learning of Halo's true purpose the Sentinels become an enemy to the Chief as he attempts to destroy Halo.
-== Combat ==
+In ''Halo 2'', 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 as the Arbiter 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]].
-[[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(in Halo 2 and 3 only); any foot soldier can pick the beam up and fire it manually.
+Sentinels in ''Halo 3'' are also seen on the [[Ark]] and aids the Chief as he makes his way towards the cartographer After the death of 343 Guilty Spark the Sentinels once again become an enemy. A different variant of Sentinels have also been seen on [[Onyx]]; and serve as a shield to protect anything without proper clearance from getting near the Shield World.
-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 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.
-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.
+==Variants==
+Different variants of the Sentinel have been utilized for different combat roles from and can vary from construct to construct; the following is a list of all known variants of the Sentinel.
-== Appearances ==
+===[[Sentinel Major]]===
-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.
+Sentinel Majors are larger, more powerful Sentinel models used for heavy combat situations. They provide backup for Enforcers in the event of a massive Flood outbreak or attacks on the Halo Installations.
-== Weaknesses ==
+===[[Enforcer]]===
-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.
+Essentially heavy Sentinels, Enforcers are equipped with a variety of offensive and defensive weaponry, including Heavy Needlers Missile Projectiles, Sentinel Beams, and duel Energy Shields covering both their top and bottom halves. They are designed to handle major Flood outbreaks but are also capable of defending their Halo Installation for external threats.
-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.
+===[[Onyx Sentinel]]===
+Onyx Sentinels both guard and make up the Shield World of Onyx. Despite an appearance similar to other Sentinels, Onyx Sentinels are far more formidable opponents for a variety of reasons.
 ==Trivia==
+*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]]).
-[[Image:POAEngineRoom.jpg|thumb|right|200px|Sentinels fighting the [[Flood]].]]
-[[Image:Sentinel.jpg|200px|thumb|right|A Sentinel in ''[[Halo: Combat Evolved]]''.]]
-*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.
-*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 'surf' on 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 opened for the Scorpions and Warthogs. The Sentinel will, eventually, hover over the edge, holding you up 50% of the time. Remaining on top of the Sentinel allows you to reach inaccessible locations.
 *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.''"
-*In ''Halo Wars'', Sentinels can be produced to fight for you in the map [[Repository]].
-*In the Halo 3 multiplayer maps [[Construct]] and [[Isolation]], they can be seen in the distance and can be shot down.
 *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.
+*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.
 == Gallery ==
 <gallery>
+Image:Sentinel.jpg|A Sentinel in ''[[Halo: Combat Evolved]]''.
+File:Sentinalshield.jpg|A Sentinels shielding as seen in ''Halo: CE''.
 File:SilverSentinal02.jpg|A pair of ''Sentinels'' in ''[[Halo 2]]''.
-File:SilverSentinal01.jpg|Another Halo 2 Sentinel.
-File:Sentinalshield.jpg|A ''Sentinel's'' shielding from ''[[Halo PC]]''.
-File:Sentinal.jpg|Sentinels in ''[[Halo 3]].''
-File:1212706515 Idle Sentinel.jpg|A ''[[Halo 3]]'' Sentinel in its folded-up "idle" form.
-File:1218128875 SentinelDestroyed.jpg|A destroyed Sentinel, ''[[Halo 2]]'' era.
 File:Sentinol.jpg|A Halo 3 Sentinel.
-File:Covenant Sentinels.jpg| Two Sentinels in [[Halo Wars]] under Covenant control.
+File:1216051911 Sentinel.jpg|The Sentinels Energy Shield as seen in Halo 3.
-File:Sentinel wars.jpg|A UNSC Sentinel in Halo Wars
+File:1212706515 Idle Sentinel.jpg|A Sentinel in its folded-up "idle" form.
-File:DJC-Sentinel.jpg|A ''Halo 3'' Sentinel on [[Isolation]].
+Image:DJC-Sentinel.jpg|A ''Halo 3'' Sentinel on [[Isolation]].
 File:Sentinel_Closeup.jpg|A close up of a Sentinel, circa Halo 2
+Image:POAEngineRoom.jpg|Sentinels fighting the Flood.
 </gallery>