Editing Covenant Citadel

{{Status|Canon}}
[[File:Halo-wars-Covenant-base.jpg|thumb|300px|A Covenant citadel.]]
The '''citadel''', sometimes known as '''occupation citadel'''{{Ref/Book|Id=enc22p301|Enc22|Page=301}} or a '''forward operations citadel'''{{Ref/Book|Id=enc22p223|Enc22|Page=223}}, is a [[Covenant]] [[Socket Base|base structure]], and the Covenant equivalent of the [[Firebase|UNSC Firebase]].{{Ref/Site|Id=hwsite|URL=http://www.halowars.com/GameInfo/Citadel.aspx|Site=Official Halo Wars Community Site|Page=Citadel|D=18|M=11|Y=2010|LocalArchive=Archive:Halowars.com/Covenant#Citadel}} It contains a command center, [[seven]] modular building sites, and four turret foundations.

== Overview ==
===Design details===
The citadel is a basic command structure deployed during interplanetary warfare or occupation campaigns. The citadel provides field command facilities for the commander of invading or defending Covenant forces to issue orders; it employs a modular system to build structures that support aggressive colonization as well as rapid deployment of troops and armor. Whereas UNSC Firebases and [[Banished Outpost]]s are prefabricated and airlifted into the battlefield large transport craft such as the [[D20 Heron]], [[D81-LRT Condor]] or [[Lich]], Covenant citadels and their supporting sub-structures are [[Teleporter|teleported]] into the battlefield whole. From here, supplies are driven into the base via [[gravity lift]] and stored in the Warehouses.{{Ref/Reuse|hwsite}} Once established, a large gravity lift is established in the front of the base, which can be used to move troops and vehicles to the front lines of the battle. The citadel does not appear to have any physical openings for which to enter or exit the base—troops simply use teleporters to enter and exit the base. When threatened, the base can lock down, which will establish a shield around the teleporter into the base to prevent unauthorised entry or exit into or out of the base.

===Minibase===
[[File:HW CovenantMinibase.png|thumb|A Covenant Minibase on Arcadia.]]
The Covenant also made use of Minibases, smaller outposts only capable of supporting one additional structure. They were notably employed during the Battle of the Trove, where they were used as forward airbases with which to construct {{Pattern|Oghal|Banshee}}s and {{Pattern|Bkowe'nei|Vampire}}s.{{Ref/Level|Id=beachhead|HW|Beachhead (Halo Wars level)|Beachhead}} Unlike their UNSC [[Firebase#Minibase|counterpart]], there is no structure for the building of the Covenant minibase to attach to; simply a teleporter pad on the ground for troops and supplies to use to enter the lone building.

=== Expansions ===
The citadel is capable of hosting up to seven modular structures, alongside up to four turret slots.
*[[Covenant Temple|Temple]]
*[[Covenant Warehouse|Warehouse]]
*[[Covenant Hall|Hall]]
*[[Covenant Factory|Factory]]
*[[Summit (building)|Summit]]
*[[Covenant Shield Generator|Shield generator]]
*{{Pattern|Kewu Umppi'pa'|citadel turret}}

==History==
[[File:Hroa4 raid.png|thumb|A citadel is attacked by the Banished.]]
Covenant citadels were employed by the Covenant during several battles in [[2531]]. One was employed during the [[Harvest campaign]], in which it was used to defend the [[Relic (location)|relic]].{{Ref/Level|HW|Relic Approach}} Several were later used in the [[Battle for Arcadia]]; one was deployed in [[Pirth City]] to defend a {{Pattern|Emp'seam|Antlion}} that was shelling the city,{{Ref/Level|HW|Arcadia City}} while another was deployed in the city's outskirts.{{Ref/Level|HW|Arcadia Outskirts}} Several citadels and minibases were deployed under the protection of a massive Covenant [[Energy shielding|dome]], though they would eventually be destroyed by an [[Orbital bombardment]].{{Ref/Level|HW|Dome of Light}} The Covenant also made extensive use of citadels during the [[Battle of Trove]]; UNSC forces from the {{UNSCShip|Spirit of Fire}} destroyed four citadels to establish a stronger foothold on the surface.{{Ref/Reuse|beachhead}} 

At some point before the [[Battle of Line Installation 1-4]] in [[2552]], [[SPARTAN-II program|Spartan-II]] [[Black Team]] destroyed a citadel.{{Ref/Comic|HBL|Issue=5}} Shortly following the end of the Human-Covenant War, a citadel being used as an airbase on the swamp-moon of [[Kostroda]] by shipmaster [[Let 'Volir]] would be attacked by [[Atriox]] and his Banished forces.{{Ref/Comic|RoA|Issue=4}}

== In-game information ==
===''Halo Wars''===
[[File:COVENANT Citadel 1.jpg|thumb|The citadel with no buildings or fortifications.]]
{{Quote|Use this to construct a new Outpost Base. Eventually, it can be upgraded to a full Citadel, increasing your ability to crush the evil enemy filth.|In-game description}}
In ''[[Halo Wars]]'', a default Outpost costs {{HWResources|500}} [[Supplies|resources]] to be built, and only provides three construction slots and no turret foundations. A gravity lift is automatically placed at the front of the base; units (other than the Scarab) can be sent to the gravity lift which transports them to the Leader unit's location. The gravity lift can also be used to recall the Leader unit to the base instantaneously for the cost of {{HWResources|100}}.

The Outpost has two upgrades, ''Keep'' and ''Citadel''.
*The '''Keep''' is an upgraded version of the Firebase, retaining the command center, but adding two more building sites (for a total of five) and four turret foundations.
*The '''Citadel''' upgrade allows two other building sites, totaling to [[seven]] building sites and the same four turret sites from the station. It also features a self-destruct sequence allowing it to destroy itself for other allies to make a base in its spot and damage any enemy units nearby. The Citadel also allows for a lock sequence that will not allow any newly trained units to leave the base when done training/being produced.

Each building slot and turret slot can accommodate one additional structure.
{| class="wikitable" style="width: 75%;" 
! rowspan="2" style="width: 20%" | Name !! rowspan="2" style="width: 10%" | Type !! colspan="3" style="width: 30%" | Cost !! rowspan="2" style="width: 40%" | Description
|- 
| style="width: 10%" | '''Population''' || style="width: 10%" | '''Tech''' || style="width: 10%" | '''Resources''' 
|- style="height: 40px"
| Turret || Base Defense || N/A || {{HWTech|0}} || {{HWResources|250}} || Turrets are good at defending bases against all enemy targets. 
|- style="height: 40px"
| Warehouse || Produces Resources || N/A || {{HWTech|0}} || {{HWResources|100}} || The Covenant Warehouse produces the resources needed to train units, building buildings, and buy technology upgrades. Bases that have great economic production might have 6 Warehouses.
|- style="height: 40px"
| Temple || Increases Tech Level || {{HWPop|1/1}}{{Ref/Note|Id=temple|Only one Temple can be built at any time.}} || {{HWTech|0}} || {{HWResources|500}} || Temples allow the Covenant to access advanced buildings, units and technology upgrades.
|- style="height: 40px"
| Shield Generator || Base Protection || N/A || {{HWTech|1}} || {{HWResources|200}} || Generates a large bubble shield to protect the base. Multiple Shield Generators can be built in a base to compound the shield's strength.
|- style="height: 40px"
| Hall || Trains Infantry || N/A || {{HWTech|0}} || {{HWResources|150}} || The Covenant Hall rallies infantry units to the cause. Upgrades for infantry units are also housed here.
|- style="height: 40px"
| Factory || Trains Vehicles || N/A || {{HWTech|0}} || {{HWResources|150}} || Most Covenant vehicles are pieced together and upgraded at the Factory.
|- style="height: 40px"
| Summit || Trains Aircraft || N/A || {{HWTech|0}} || {{HWResources|150}} || Covenant aircraft are constructed at the Summit. Aircraft upgrades are also in this structure.
|}

Among other things, the Citadels themselves can produce units and corresponding improvements for them.
{| class="wikitable" style="width: 75%;" 
! rowspan="2" style="width: 20%" | Name !! rowspan="2" style="width: 10%" | Type !! colspan="3" style="width: 30%" | Cost !! rowspan="2" style="width: 40%" | Description
|- 
| style="width: 10%" | '''Population''' || style="width: 10%" | '''Tech''' || style="width: 10%" | '''Resources''' 

|-
! colspan="6"|All Leaders

|- style="height: 40px"
| Keep || Upgrade || N/A || {{HWTech|0}} || {{HWResources|300}} || Upgrades base to a Keep, which adds two more building sites.
|- style="height: 40px"
| Citadel || Upgrade || N/A || {{HWTech|0}} || {{HWResources|400}} || Upgrades base to a Citadel, which adds two more building sites.

|- style="height: 40px"
| [[Deutoros-pattern Scarab|Scarab]] || Uber Unit || {{HWPop|20}} || {{HWTech|3}} || {{HWResources|3,000}} || The Covenant Super Unit. These massive assault vehicles have a [[Focus cannon|devastating beam]] that can tear part virtually anything.

|-
! colspan="6"|[[Ripa 'Moramee|Arbiter]]

|- style="height: 40px"
| [[Suicide Unggoy|Suicide Grunts]] || Special Forces || {{HWPop|1}} || {{HWTech|1}} || {{HWResources|160}} || Suicide Grunts are a perverted variant of the already dangerous [[Unggoy|Grunts]]. They can sacrifice themselves on enemy targets using the Suicide Ability.
|- style="height: 40px"
| Zeal || Upgrade || N/A || {{HWTech|2}} || {{HWResources|500}} || Suicide Grunts are faster in Suicide Mode.
|- style="height: 40px"
| Defile || Upgrade || N/A || {{HWTech|3}} || {{HWResources|800}} || The Suicide Grunt's explosion splashes enemies with burning chemicals.

|-
! colspan="6"|[[Avitus|Brute Chieftain]]

|- style="height: 40px"
| Brute || Special Forces || {{HWPop|1}} || {{HWTech|1}} || {{HWResources|150}} || Specialized, heavy infantry with powerful [[Jovokada Workshop brute shot|Brute guns]], these squads dish out lots of damage.
|- style="height: 40px"
| Jump Pack Ability || Upgrade || N/A || {{HWTech|2}} || {{HWResources|500}} || Enables the Jump Pack Ability, allowing Brutes to quickly cross the battlefield.
|- style="height: 40px"
| Electric Shot || Upgrade || N/A || {{HWTech|3}} || {{HWResources|800}} || The Bute Shot causes electrical stun damage when it hits.

|-
! colspan="6"|[[Prophet of Regret]]

|- style="height: 40px"
| [[Honor Guard#Sangheili|Elite Honor Guard]] || Special Forces || {{HWPop|1}} || {{HWTech|1}} || {{HWResources|125}} || Specialty troops that guard the Prophet. These stealthy infantry wield powerful [[Energy sword (fiction)|plasma swords]] capable of shredding any target.
|- style="height: 40px"
| [[Active camouflage|Cloak]] Ability || Upgrade || N/A || {{HWTech|2}} || {{HWResources|500}} || Enables Cloak Ability.
|- style="height: 40px"
| [[Energy shielding|Personal Shield]] || Upgrade || N/A || {{HWTech|3}} || {{HWResources|800}} || Adds a personal shield that decreases incoming damage.
|}

==Gallery==
{{Linkbox|gallery=yes|gallerypage=Images of Covenant citadel}}
===Concept art and illustrations===
<gallery>
File:HW-CovenantBuilding_Concept.jpg|Concept art of a building for the Citadel.
File:HW-Concept-CovenantTeleporterPad.jpg|Concept art of the [[gravity lift]] pad on the front of the citadel.
File:HW Citadel_Concept.jpg|Concept art of the Covenant citadel.
File:HROA Citadel 3D.jpg|An early 3D placement pass on a Citadel in ''Halo: Rise of Atriox''.
File:HROA Citadel Sketch.jpg|Early sketch of the Citadel in ''Halo: Rise of Atriox''.
</gallery>
===Renders===
<gallery>
File:COVENANT Equipment.jpg|The citadel's turrets, building pad, and gravity lift.
File:HW Citadel Render 1.jpg|A render of the citadel model in ''Halo Wars'', with poly and texture information.
File:HW_CovenantMinibase_Render.jpg|A render of the Covenant minibase with no attached buildings.
</gallery>
===Screenshots===
<gallery>
File:HW ShieldedCitadel Screenshot.jpg|A shielded Covenant citadel.
File:HW Screenshots E3 7.jpg|A Covenant citadel defended by Covenant troops and vehicles.
File:HW Screenshots E3 6.jpg|A Covenant citadel under attack.
File:HaloWars-CovBase01-Screenshot.jpg|A Citadel and a Covenant army supporting it.
File:HW Screenshots Leipzig 3.jpg|Two Citadels on [[Frozen Valley]].
File:HWDE PirthOutskirts TugOfWar.jpg|A Citadel in a round of [[Tug of War]] on [[Pirth Outskirts]].
</gallery>

==List of appearances==
*''[[Halo Wars]]'' {{1st}}
*''[[Halo: Blood Line]]''
*''[[Halo Wars 2]]'' {{Mo}}
*''[[Halo: Rise of Atriox]]''

==Notes==
{{Ref/Notes}}

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

{{HW buildings}}
[[Category:Covenant buildings]]
[[Category:Fortifications]]