编辑“巨型结构”

{{version|3.3}}
[[File:Utopia Loading Screen.png|thumb|320px|Humanoid Empire constructing a Dyson Sphere]]
Megastructures are colossal constructions. Expensive and time-consuming to build or repair, these remarkable feats of engineering are nonetheless important wonders that provide large bonuses, demonstrating the technological and economic primacy of the builders' empire.

== Construction ==
A construction ship is required to build the first stage (construction site) of any megastructure. If it has multiple stages, the following stages do not require a construction ship. All megastructures have a different texture depending on the empire that built or repaired them.

=== Requirements ===
All megastructures except for Gateways have a [[DLC]] prerequisite:

* Ring worlds, Dyson Spheres, Science Nexus, and Sentry Arrays require the {{iconify|Utopia}} DLC
* Matter Decompressors, Mega Art Installations, Strategic Coordination Centers, and Interstellar Assemblies requires the {{iconify|MegaCorp}} DLC
* Mega Shipyards require the {{iconify|Federations}} DLC
* Habitats require the {{iconify|Utopia}} DLC unless you're using the {{iconify|Void Dwellers}} origin from the {{iconify|Federations}} DLC

With the relevant DLC enabled, each type of megastructure first requires researching its corresponding technology. Except for habitats, all of these technologies have {{iconify|Mega-Engineering|24px|tech=rare}} as a prerequisite. Additionally, the {{iconify|Galactic Wonders}} ascension perk is required to unlock the technologies for Ring worlds, Dyson Spheres, and Matter Decompressors as research options.

Each megastructure also has placement and solar system related requirements. Those are listed in the relevant subsections below.

{| class="mildtable sortable mw-collapsible mw-collapsed"
! Megastructure !! DLC !! Field !! Technology !! Other requirements{{0}}
|-
| rowspan="2" | [[#Habitats|Habitat]] || {{iconify|Utopia|sort=icon|text=}}
| {{iconify|voidcraft|sort=icon|row=2|text=}} 3 || {{iconify|Orbital Habitats|24px|sort=icon|row=2}} || 
|-
| {{iconify|Federations|sort=icon|text=}} || {{iconify|Void Dwellers|sort=icon}} origin

|-
| [[#Gateways|Gateway]] ||  || {{iconify|particles|sort=icon|text=}} 5 || {{iconify|Gateway Construction|24px|tech=rare|sort=icon}} || 
|-
| [[#Science Nexus|Science Nexus]] || {{iconify|Utopia|sort=icon|row=2|text=}}
| {{iconify|computing|sort=icon|row=2|text=}} 5 || {{iconify|Science Nexus|suf=tech|24px|tech=rare|sort=icon}} || 
|-
| [[#Sentry Array|Sentry Array]] || {{iconify|Sentry Array|suf=tech|24px|tech=rare|sort=icon}} || 
|-
| [[Mega Shipyard#|Mega Shipyard]] || {{iconify|Federations|sort=icon|text=}}
| {{iconify|military theory|sort=icon|row=2|text=}} 5 || {{iconify|Mega Shipyard|suf=tech|24px|tech=rare|sort=icon}} || 
|-
| [[Strategic Coordination Center#|Strategic Coordination Center]] || {{iconify|MegaCorp|sort=icon|row=3|text=}}
| {{iconify|Strategic Coordination Center|suf=tech|24px|tech=rare|sort=icon}} || 
|-
| [[Interstellar Assembly#|Interstellar Assembly]]
| {{iconify|statecraft|sort=icon|row=2|text=}} 5 || {{iconify|Interstellar Assembly|suf=tech|24px|tech=rare|sort=icon}} || 
|-
| [[#Mega Art Installation|Mega Art Installation]]
| {{iconify|Mega Art Installation|suf=tech|24px|tech=rare|sort=icon}} || 
|-
| [[#Ring world|Ring world]] || {{iconify|Utopia|sort=icon|row=2|text=}}
| {{iconify|voidcraft|sort=icon|text=}} 5 || {{iconify|Ring World|suf=tech|24px|tech=acquire|sort=icon}}
| {{iconify|Galactic Wonders|sort=icon|row=3}} ascension perk
|-
| [[#Dyson Sphere|Dyson Sphere]]
| {{iconify|field manipulation|sort=icon|row=2|text=}} 5 || {{iconify|Dyson Sphere|suf=tech|24px|tech=acquire|sort=icon}}
|-
| [[#Matter Decompressor|Matter Decompressor]] || {{iconify|MegaCorp|sort=icon|text=}} || {{iconify|Matter Decompressor|suf=tech|24px|tech=acquire|sort=icon}}
|}

=== Construction speed bonuses ===
A few bonuses affect megastructure construction speed. These are highly desirable considering the great time requirements of such projects:
* [[File:ap master builders.png|link=Ascension perk|Master Builders|21px]] Master Builders ascension perk increases the build speed by {{green|+50%}}
* {{icon|edict}} Living Metal Mega-Construction edict increases the build speed by {{green|+50%}}
* {{icon|edict}} Architectural Renaissance unity ambition also increases the build speed by {{green|+50%}}
* [[File:R contingency core.png|24px]] Using the Isolated Contingency Core relic greatly increases the build speed by {{green|+300%}} for 10 years

== Gateways ==
{{SVersion|3.3}}
[[File:Distant Stars Loading Screen.png|thumb|320px|Real scale of a Gateway]]
While exploring the galaxy, empires can find abandoned gateways that were once part of a massive, galaxy-spanning network. The number of abandoned gateways can be scaled by galaxy settings. Owning a system with an inactive Gateway drastically increases the chance for the {{iconify|Gateway Activation|21px}} technology to appear, which is required to reactivate them.

Reactivation of an abandoned gateway takes 2 years and costs {{red|6000}} {{iconify|energy}} and {{red|2500}} {{iconify|alloys}}. When a Gateway is reactivated for the first time in the galaxy, another random Gateway will also reactivate along with it.

Empires can build their own Gateways by researching the {{iconify|Gateway Construction|21px}} technology, which requires the Empire to have encountered any pre-existing Gateways, so if Gateways were disabled during [[galaxy]] creation, it is impossible to build any new ones.

Each system can only have one Gateway. They can be constructed even in a system with an [[L-Gate]] or a [[wormhole]]. The construction site must be built outside the system gravity well and is built in 3 years and costs {{red|75}} {{iconify|influence}} and {{red|2500}} {{iconify|alloys}}. Upgrading it into a fully functional Gateway takes 3 years and costs {{red|6000}} {{iconify|energy}} and {{red|2500}} {{iconify|alloys}}.

Gateways can travel to any other gateway, so long as the empire that owns the gateway has its borders open and is not at war with the traveling fleet's empire. Due to the unique system of the [[L-Gate]], you can jump through one to the L-Cluster, then onto another L-gate so long as its borders are open, or you are at war. Regular empires cannot close their borders to Fallen Empires, therefore regular empires' Gateways can always be accessed by the Fallen Empires, except while at war with them. [[Claims]] can be extended through gateways, however only if the borders are open on the side that's getting claimed. [[Sectors]] don't extend through gateways. 

Gateways are able to greatly enhance and simplify [[trade]] routes.

Gateways can't be deactivated or destroyed once they are fully activated or constructed.

== Habitats ==
{{Expansion|utp|fed}}{{SVersion|3.3}}
[[File:Plantoid Habitat.png|thumb|Plantoid size 4 habitat]]
Artificial planets in all but name, [[Celestial bodies#Habitat|habitats]] have {{green|70%}} {{icon|habitability}} Base Habitability for all species regardless of climate preference and can be built orbiting planets. Habitats have a unique set of [[Districts#Habitat districts|Districts]] distinct from normal planetary ones. Habitats have up to 4 district types depending on the owner's government, with a fifth type available if the habitat is built above a planet with certain kinds of resource deposits. Its appearance depends on the builders' ship graphics. They still require [[colonization]] but the colony develops 3 times faster on a habitat.

Habitats can be researched and built by any empire if the {{iconify|Utopia}} DLC is installed. Otherwise, habitat construction is only available to empires with the {{iconify|Void Dwellers}} origin, which requires the {{iconify|Federations}} DLC. If the {{iconify|Apocalypse}} DLC is installed, empires created by the [[Marauders#The Horde|Horde]] breaking up start with the technology to construct habitats even if neither of the required DLCs is installed. These habitats can be captured by other empires.

Habitats can be destroyed by a [[Ship#Colossi|Colossus]] as well as by [[Crisis]] factions and cannot be rebuilt once destroyed.

{| class="mildtable plainlist"
! colspan="2" | {{icon|voidcraft}} Required technology
! {{iconify|pre=planet|Size}}
! {{iconify|Cost}}
! {{icon|megastructure build speed}} Time
! {{iconify|building||Housing}}s
|-
| {{icon|Orbital Habitats}} || Orbital Habitats
| style="text-align: center;" | 4
| 
* {{icon|influence}} 150
* {{icon|alloys}} 1500
| {{icon|time}} 1800 days
| {{iconify|Gestalt Consciousness}} only
|-
| {{icon|Habitat Expansion}} || Habitat Expansion
| style="text-align: center;" | 6 (+2)
| 
* {{icon|influence}} 25
* {{icon|alloys}} 1000
| {{icon|time}} 720 days
| {{icon|yes}}
|-
| {{icon|Advanced Space Habitation}} || Advanced Space Habitation
| style="text-align: center;" | 8 (+2)
| 
* {{icon|influence}} 25
* {{icon|alloys}} 1500
| {{icon|time}} 1440 days
| {{icon|yes}}
|}

{| class="mildtable plainlist"
! Source !! Habitat effects !! DLC
|-
| {{iconify|Voidborne}} ascension perk || 
* {{iconify|Habitability||+20%|green}} (90% total)
* {{iconify|Building slots||+2|green}} on habitats
* {{icon|Building}} Can upgrade [[Buildings#Housing|housing buildings]] on habitats
| {{icon|utp}}
|-
| 
* {{iconify|Void Dwellers}} origin
* {{tradition|Domination||iconify}} tradition tree adopted
| {{iconify|upkeep||{{green|−20%}} Habitat}} || {{icon|fed}}
|-
| 
* {{iconify|Void Dwellers}} origin
* {{tradition|Expansion||iconify}} tradition tree finished
| {{icon|cost}} {{green|−20%}} Habitat build cost  || {{icon|fed}}
|-
| 
* {{iconify|Void Dwellers}} origin
* {{tradition|Prosperity|Void Works|iconify|image=Tradition prosperity public works.png}} prosperity tradition
| {{iconify|Building slot||+1|green}} on habitats || {{icon|fed}}
|}

==== Habitat construction ====
Habitats can be built by a construction ship around any planet without an [[anomaly]]. Unlike other megastructures, habitats do not require a construction site and are finished in one go by the construction ship. Habitats start from size 4, which means they can hold up to 4 districts. They can be upgraded via {{iconify|decision}}s once all district slots are filled, and go up to size 8.

Placement rules
* [[File:Fleet_task_survey_system.png|24px|link=Survey]] Planet must be surveyed
* {{icon|no}}[[File:Message_anomaly.png|24px|link=Anomaly]] Planet can't have an anomaly
* {{icon|no}}[[File:Planet asteroid.png|24px|link=Asteroid]] Must be a full planet, not a moon or asteroid

Additional placement rules for AI empires
* Planet must have a resource deposit
* {{icon|starbase}} System must have an upgraded starbase
* {{icon|no}} System can't already have an uncolonized habitat

Building a habitat above a planet with a resource deposit leaves you unable to exploit its resource, destroying your mining or research station if one was present. In exchange, the habitat gains a district type and/or planetary feature depending on the type of resource deposit.

{| class="mildtable plainlist sortable"
|+ style="text-align: left;" | '''Orbital deposit effects'''
! Deposit type !! {{icon|district}} Added district type || [[File:D space walk.png|x21px|link=Planetary_features#Habitat_features]] Added habitat feature
|-
| {{iconify|Energy|sort=icon}} || [[File:District hab energy.png|24px|link=Districts#Reactor District]] Reactor District || rowspan="2" | None
|-
| {{iconify|Minerals|sort=icon}} || rowspan="2" | [[File:District mining.png|24px|link=Districts#Astro-Mining Bay]] Astro-Mining Bay
|-
| {{iconify|Alloys|sort=icon}} || [[File:Mod alloys produces add.png|24px|link=Alloys]] Deposit moves from planet to habitat
|-
| {{iconify|Research|sort=icon}} || rowspan="5" | [[File:District_hab_science.png|24px|link=Districts#Research District]] Research District || None
|-
| {{iconify|Zro|sort=icon}} || rowspan="4" | Deposit moves from planet to habitat
|-
| {{iconify|Dark Matter|sort=icon}}
|-
| {{iconify|Living Metal|sort=icon}} 
|-
| {{iconify|Nanites|sort=icon}}
|-
| {{iconify|Exotic Gases|sort=icon}} || rowspan="4" | None || [[File:Mod building gas extractors max.png|24px|link=Buildings#Gas Extraction Wells]] Can build a number of Gas Extraction Wells equal to the deposit size
|-
| {{iconify|Rare Crystals|sort=icon}} || [[File:Mod building crystal mines max.png|24px|link=Buildings#Crystal Mines]] Can build a number of  Crystal Mines equal to the deposit size
|-
| {{iconify|Volatile Motes|sort=icon}} || [[File:Mod building mote harvesting traps max.png|24px|link=Buildings#Mote Harvesting Traps]] Can build a number of Mote Harvesting Traps equal to the deposit size
|-
| {{iconify|Trade Value|sort=icon}} || None
|}

== Multi-stage megastructures ==
{{SVersion|3.3}}
Multi-stage megastructures are constructed in multiple stages that require the technology of the same name before they can be constructed. Empires lacking the technology can make use of a multi-stage megastructure they conquered from another Empire, but they cannot upgrade it before they research the technology. 

Multi-stage megastructures start with a construction site that provides no benefit. However, each subsequent construction phase will bring increasing bonuses, culminating with the end of the megastructure construction. 

Habitats and gateways can be built in the same system as multi-stage megastructures.

It is only possible to build, upgrade, or restore one multi-stage megastructures at a time. The limit can be increased by {{green|+1}} for each of the following:
* [[File:Ap master builders.png|24px]] Master Builders ascension perk
* {{icon|edict}} Architectural Renaissance ambition edict
* {{icon|research cooperative}} Level 5 Research Cooperative president

A system can also only host one multi-stage megastructures. 

Apart from the Ring World, each multi-stage megastructure can only be built once per Empire, and cannot be rebuilt if the existing one is lost control of, except for the Ring World. However, multi-stage megastructures obtained through conquest, as well as ruined ones that were found in the galaxy and then restored, do not count against the limit. A conquered incomplete megastructure can still be upgraded.

Ring Worlds can have their habitable segments overrun by a [[Ship#Colossi|Colossus]] as well as [[Crisis]] factions and cannot be repaired again. All megastructures with the exception of Gateways are destroyed by Star Eater firing upon the system's star and become unrepairable.

{| class="wikitable mildtable" cellspacing="2" cellpadding="4" 
! Megastructure
! Stage
! Production
! Upkeep
! Time
! Cost
! style="width:25%" | Notes
! {{Hover box|Ascension Perk|AP}}
! {{Hover box|Down-Loadable Content|DLC}}
|- id="Ring World"
| rowspan=6 style="border-top:2px solid black" | '''Ring World'''<br>[[File:Evt Ringworld.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}} 
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1&#8239;800|5 years}}
| style="border-top:2px solid black" | {{icon|influence}} {{red|300}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=6 style="border-top:2px solid black" | 
* {{icon|no}} Cannot be built in systems with multiple stars or black holes (but it is possible to change the star into a black hole with the Horizon Signal event chain)
* {{icon|no}} Cannot be built if there are habitable planets, anomalies, or stations present
* Can be built in system with Habitats; however, Habitats are destroyed once Stage I (frame) is complete
* All habitable segments feature {{green|100%}} {{iconify|habitability}} for each species, can build up to 10 [[Districts#Ring World districts|unique Districts]], and have their own unique Designations
* Upon completion of the frame, all planets are removed from the system
* Multiple segments can be built at the same time if the empire has the capacity to work on more than one megastructure simultaneously
| rowspan=6 style="border-top:2px solid black" | [[Image:ap galactic wonders.png|24px|link=Traditions#Galactic_Wonders]]
| rowspan=6 style="border-top:2px solid black" | {{icon|utp}}
|- 
| '''Stage I (Frame)'''
| None
| None
| {{icon|time}} {{Hover box|4 800 days|13.3 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (1 Segment)'''
| [[File:Planet ringworld.png|24px]] {{green|+1}} Habitable Segment
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (2 Segments)'''
| [[File:Planet ringworld.png|24px]] {{green|+2}} Habitable Segments
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (3 Segments)'''
| [[File:Planet ringworld.png|24px]] {{green|+3}} Habitable Segments
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
|  '''Stage V (Completed)'''
| [[File:Planet ringworld.png|24px]] {{green|+4}} Habitable Segments
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- id="Dyson Sphere"
| rowspan=6 style="border-top:2px solid black" | '''Dyson Sphere'''<br>[[File:Evt Dyson Sphere.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}} 
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800 days|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|1000}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=6 style="border-top:2px solid black" |
* Can only be constructed around regular stars
* {{icon|no}} Cannot be built if there are habitable planets, anomalies, or stations present
* Upon completion all rocky planets and moons in the system turn into frozen or cold barren worlds
* If the star has a mining station, it is removed when the megastructure is completed
* If any planet has the {{iconify|Terraforming Candidate}} modifier, it is removed
| rowspan=6 style="border-top:2px solid black" | [[Image:ap galactic wonders.png|24px|link=Traditions#Galactic_Wonders]]
| rowspan=6 style="border-top:2px solid black" | {{icon|utp}}
|- 
| '''Stage I (Frame)'''
| None
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Partial 25%)'''
| {{icon|energy}} {{green|+1000}} Energy
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Partial 50%)'''
| {{icon|energy}} {{green|+2000}} Energy
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (Partial 75%)'''
| {{icon|energy}} {{green|+3000}} Energy
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage V (Completed)'''
| {{icon|energy}} {{green|+4000}} Energy
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|alloys}} {{red|10000}}
|- id="Science Nexus"
| rowspan=4 style="border-top:2px solid black"| '''Science Nexus'''<br>[[File:Evt Science Nexus.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−25}}
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=4 style="border-top:2px solid black" | 
* The final stage of a Science Nexus can be upgraded to produce {{green|50}} more {{iconify|Research}} through an event that has a 30% chance to trigger a short time after the Megastructure is finished
| rowspan=4 style="border-top:2px solid black" | 
| rowspan=4 style="border-top:2px solid black" | {{icon|utp}}
|- 
| '''Stage I (Hub)'''
| {{icon|research}} {{green|+100}} Research<br>{{icon|research speed}} {{green|+5%}} Research Speed
| {{icon|energy}} {{red|−50}}
| {{icon|time}} {{Hover box|3 600|10 years}}
|  {{icon|alloys}} {{red|15000}}
|- 
| '''Stage II (Research Wings)'''
| {{icon|research}} {{green|+200}} Research<br>{{icon|research speed}} {{green|+10%}} Research Speed
| {{icon|energy}} {{red|−75}}
| {{icon|time}} {{Hover box|3 600|10 years}}
|  {{icon|alloys}} {{red|15000}}
|- 
| '''Stage III (Completed)'''
| {{icon|research}} {{green|+300}} Research<br>{{icon|research speed}} {{green|+15%}} Research Speed
| {{icon|energy}} {{red|−100}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- id="Sentry Array"
| rowspan=5 style="border-top:2px solid black"| '''Sentry Array'''<br>[[File:Evt Sentry Array.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−20}}
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=5 style="border-top:2px solid black" |
* Until finished, the Sentry Array cannot see through nebulae
* As no system will have low intel level, a completed Sentry Array will prevent space creatures from respawning
| rowspan=5 style="border-top:2px solid black" | 
| rowspan=5 style="border-top:2px solid black" | {{icon|utp}}
|- 
| '''Stage I (Sentry Hub)'''
| {{icon|sensor range}} {{green|+20}} Hyperlane Scanner Range<br>{{icon|base intel level}} {{green|+10}} Base intel level
| {{icon|energy}} {{red|−40}}
| {{icon|time}} {{Hover box|1 800|5 years}}
|  {{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Sentry Spire)'''
| {{icon|sensor range}} {{green|+40}} Hyperlane Scanner Range<br>{{icon|base intel level}} {{green|+20}} Base intel level
| {{icon|energy}} {{red|−60}}
| {{icon|time}} {{Hover box|1 800|5 years}}
|  {{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Sentry Aerials)'''
| {{icon|sensor range}} {{green|+60}} Hyperlane Scanner Range<br>{{icon|base intel level}} {{green|+30}} Base intel level
| {{icon|energy}} {{red|−80}}
| {{icon|time}} {{Hover box|1 800|5 years}}
|  {{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (Completed)'''
| {{icon|sensor range}} {{green|Entire Galaxy}} Hyperlane Scanner Range<br>{{icon|base intel level}} {{green|+40}} Base intel level
| {{icon|energy}} {{red|−100}}
| {{icon|time}} {{Hover box|1 800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- id="Matter Decompressor"
| rowspan=5 style="border-top:2px solid black"| '''Matter Decompressor'''<br>[[File:Evt Matter Decompressor.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}}
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=5 style="border-top:2px solid black" |
* Can only be constructed around black holes
* {{icon|no}} Cannot be built if there are habitable planets, anomalies, or stations present
* If the black hole has a research station, it is removed when the megastructure is completed
| rowspan=5 style="border-top:2px solid black" | [[Image:ap galactic wonders.png|24px|link=Traditions#Galactic_Wonders]]
| rowspan=5 style="border-top:2px solid black" | {{icon|mgc}}
|- 
| '''Stage I (Anchor)'''
| {{icon|minerals}} {{green|+500}} Minerals
| {{icon|energy}} {{red|−25}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|12500}}
|- 
| '''Stage II (Lensing)'''
| {{icon|minerals}} {{green|+1000}} Minerals
| {{icon|energy}} {{red|−50}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|12500}}
|- 
| '''Stage III (Boring)'''
| {{icon|minerals}} {{green|+1500}} Minerals
| {{icon|energy}} {{red|−75}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|12500}}
|- 
| '''Stage IV (Completed)'''
| {{icon|minerals}} {{green|+2000}} Minerals
| {{icon|energy}} {{red|−100}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|12500}}
|- id="Mega Art Installation"
| rowspan=5 style="border-top:2px solid black"| '''Mega Art Installation'''<br>[[File:Evt Mega Art Installation.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}}
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=5 style="border-top:2px solid black" | 
* The final stage requires the {{iconify|Ancient Relics}} DLC
* A ruined Mega Art Installation will be repaired to stage 3, and can be upgraded to stage 4 as with the constructed version
| rowspan=5 style="border-top:2px solid black" | 
| rowspan=5 style="border-top:2px solid black" | {{icon|mgc}}
|- 
| '''Stage I (Nascency)'''
| {{icon|unity}} {{green|+100}} Unity<br>{{icon|amenities}} {{green|+5%}} Amenities
| {{icon|energy}} {{red|−10}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- 
| '''Stage II (Maturity)'''
| {{icon|unity}} {{green|+200}} Unity<br>{{icon|amenities}} {{green|+10%}} Amenities
| {{icon|energy}} {{red|−20}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- 
| '''Stage III (Completed)'''
| {{icon|unity}} {{green|+300}} Unity<br>{{icon|amenities}} {{green|+15%}} Amenities
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- 
| '''Stage IV (Perfection)'''
| {{icon|unity}} {{green|+400}} Unity<br>{{icon|amenities}} {{green|+20%}} Amenities
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|minor artifacts}} {{red|100}}
|- id="Strategic Coordination Center"
| rowspan=4 style="border-top:2px solid black"| '''Strategic Coordination Center'''<br>[[File:Evt Strategic Coordination Center.png|200px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}}
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=4 style="border-top:2px solid black" | 
| rowspan=4 style="border-top:2px solid black" | 
| rowspan=4 style="border-top:2px solid black" | {{icon|mgc}}
|- 
| '''Stage I (Hull)'''
| {{icon|naval capacity}} {{green|+50}} Naval Capacity<br>{{icon|starbase capacity add}} {{green|+2}} Starbase capacity<br>{{icon|starbase}} {{green|+4}} Defense Platforms<br>{{icon|sublight speed}} {{green|+5%}} Sublight Speed
| {{icon|energy}} {{red|−25}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- 
| '''Stage II (Comms)'''
| {{icon|naval capacity}} {{green|+100}} Naval Capacity<br>{{icon|starbase capacity add}} {{green|+4}} Starbase capacity<br>{{icon|starbase}} {{green|+8}} Defense Platforms<br>{{icon|sublight speed}} {{green|+10%}} Sublight Speed
| {{icon|energy}} {{red|−50}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- 
| '''Stage III (Completed)'''
| {{icon|naval capacity}} {{green|+150}} Naval Capacity<br>{{icon|starbase capacity add}} {{green|+6}} Starbase capacity<br>{{icon|starbase}} {{green|+12}} Defense Platforms<br>{{icon|sublight speed}} {{green|+15%}} Sublight Speed
| {{icon|energy}} {{red|−75}}
| {{icon|time}} {{Hover box|3 600|10 years}}
| {{icon|alloys}} {{red|15000}}
|- id="Interstellar Assembly"
| rowspan=5 style="border-top:2px solid black"| '''Interstellar Assembly'''<br>[[File:Evt Interstellar Assembly.png|195px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}}
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1 800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=5 style="border-top:2px solid black" |
| rowspan=5 style="border-top:2px solid black" | 
| rowspan=5 style="border-top:2px solid black" | {{icon|mgc}}
|- 
| '''Stage I (Locus)'''
| {{icon|diplo weight mult}} {{green|+10%}} Diplomatic weight<br>{{icon|opinion}} {{green|+10}} Opinion from all empires
| {{icon|energy}} {{red|−10}}
| {{icon|time}} {{Hover box|1 800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Consul Ring)'''
| {{icon|diplo weight mult}} {{green|+20%}} Diplomatic weight<br>{{icon|opinion}} {{green|+10}} Opinion from all empires<br>{{icon|available envoys}} {{green|+1}} Available envoys
| {{icon|energy}} {{red|−20}}
| {{icon|time}} {{Hover box|1 800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Forum Modules)'''
| {{icon|diplo weight mult}} {{green|+30%}} Diplomatic weight<br>{{icon|opinion}} {{green|+30}} Opinion from all empires<br>{{icon|available envoys}} {{green|+1}} Available envoys
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|1 800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (Completed)'''
| {{icon|diplo weight mult}} {{green|+40%}} Diplomatic weight<br>{{icon|opinion}} {{green|+50}} Opinion from all empires<br>{{icon|available envoys}} {{green|+2}} Available envoys
| {{icon|energy}} {{red|−40}}
| {{icon|time}} {{Hover box|1 800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- id="Mega Shipyard"
| rowspan=4 style="border-top:2px solid black" | '''Mega Shipyard'''<br>[[File:Evt Megashipyard.png|195px]]
| style="border-top:2px solid black" | '''Site'''
| style="border-top:2px solid black" | None
| style="border-top:2px solid black" | {{icon|energy}} {{red|−5}} 
| style="border-top:2px solid black" | {{icon|time}} {{Hover box|1&#8239;800|5 years}}
| style="border-top:2px solid black" | {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|3000}}
| rowspan=4 style="border-top:2px solid black" | 
* All ships start with {{green|100 experience}}
* Can only be built around stars, in one-star systems, and only if there is no research or mining station on them
| rowspan=4 style="border-top:2px solid black" | 
| rowspan=4 style="border-top:2px solid black" | {{icon|fed}}
|- 
| '''Stage I (Framework)'''
| [[File:Sb shipyard.png|24px]] {{green|+5}} Shipyard Capacity<br>{{icon|ship build speed}} {{green|+33%}} Empire Ship Build Speed
| {{icon|energy}} {{red|−10}}
| {{icon|time}} {{Hover box|1&#8239;800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Core)'''
| [[File:Sb shipyard.png|24px]] {{green|+10}} Shipyard Capacity<br>{{icon|ship build speed}} {{green|+66%}} Empire Ship Build Speed
| {{icon|energy}} {{red|−20}}
| {{icon|time}} {{Hover box|1&#8239;800|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Complete)'''
| [[File:Sb shipyard.png|24px]] {{green|+20}} Shipyard Capacity<br>{{icon|ship build speed}} {{green|+100%}} Empire Ship Build Speed<br>[[File:sb colossus assembly yard.png|24px]] Titan, Colossus, and Juggernaut construction
| {{icon|energy}} {{red|−40}}
| {{icon|time}} {{Hover box|1&#8239;800|5 years}}
| {{icon|alloys}} {{red|10000}}
|}

=== Ruined megastructures ===
[[File:ruined dyson sphere.png|thumb|310px|Ruined Dyson Sphere]]
A ruined version of a multi-stage megastructure can be found while exploring the galaxy, with larger galaxies having a chance to spawn more ruined megastructures. Repairing them only requires the {{iconify|Mega-Engineering|24px}} technology. If not yet researched, owning a system with a ruined megastructure also grants a ×20 weight for {{iconify|Mega-Engineering|21px}} to appear as a researchable technology. 

While they upgrade from their broken to a fully functional state in one step, they do not count for any achievements. However, they do not count against any build limit for that particular megastructure, either.
{| class="mildtable plainlist"
! Ruined Megastructure !! {{iconify|Time}} !! {{iconify|Alloys}} !! System notes
|- 
| Dyson Sphere || {{hover|20 years|7200}} || 20000 || 
|- 
| Science Nexus || {{hover|13 years|4800}} || 15000 ||
|- 
| Sentry Array || {{hover|13 years|4800}} || 15000 || Contains a Tomb World
|- 
| Matter Decompressor || {{hover|13years|4800}} || 20000 || Always in a Black Hole system
|- 
| Mega Art Installation || {{hover|13 years|4800}} || 20000 || Is always a trinary system
|- 
| Strategic Coordination Center || {{hover|13 years|4800}} || 15000 || 
|- 
| Interstellar Assembly || {{hover|10 years|3600}} || 15000 || Contains deposits on most celestial bodies
|- 
| Mega Shipyard || {{hover|10 years|3600}} || 10000 || 
|-
| Ring Section || {{hover|10 years|3600}} || 10000 || 
|}

=== Conquerable Ringworlds ===
Up to 8 ringworlds can spawn naturally in a game in various states. Damaged segments can be repaired with the {{iconify|Mega-Engineering|24px}} technology for the same cost as finishing a new segment.
* 1 in the [[Sanctuary]] system. All 4 habitable sections are intact and each contains one pre-FTL civilization, none advanced beyond Steam Age. The system was abandoned by an Enigmatic Observer Fallen Empire but contains automated defense platforms totaling over 50k [[Space_warfare#Combat|fleet power]].
* 1 in the [[Cybrex Alpha]] system. It requires completing the Cybrex precursor event chain. The ringworld is completely ruined and requires repairs on each section.
* 1 in the [[Cybrex Beta]] system. It will only be revealed if [[the Contingency]] sterilizes 20% of the galaxy. A short time after the Contingency is defeated, the Cybrex will leave the galaxy, leaving the ringworld free for the taking.
* 1 in a random empty system if {{iconify|Utopia}} DLC is activated. It is completely ruined and each section requires repairing. If the {{iconify|Distant Stars}} DLC is activated as well the system has a 50% chance to contain a unique anomaly.
* 3 in the systems of the [[Ancient Caretakers]] if {{iconify|Synthetic Dawn}} DLC is activated. The ringworld in the home system has 3 intact and one ruined section while the other two ringworlds are completely ruined and require each section to be repaired separately. If the Contingency appears and the Ancient Caretakers awaken to defend the galaxy, they will also disappear like the Cybrex once the Contingency is defeated, leaving their systems free for the taking.
* Each empire with the {{iconify|Shattered Ring}} origin starts in a ringworld system with an intact segment and two damaged ones. By default only one empire with the origin can be generated but force-spawning will ignore the limit.

=== Aetherophasic Engine ===
{{expansion|nem}}
The Aetherophasic Engine is a megastructure that will appear in the capital system of every empire that reaches the final crisis level. Each stage of the megastructure requires gargantuan amounts of {{iconify|dark matter}} as well as 10 years to upgrade. If the system is conquered by another empire the megastructure is ruined and can be repaired if the original empire reclaims it.
{| class="mildtable plainlist" style="text-align: center;
! Stage
! {{iconify|Energy}}
! {{iconify|Minerals}}
! {{iconify|Naval capacity}}
! {{iconify|Opinion}}
! {{iconify|Dark matter}} required
! Reward if conquered
! Effects
|-
| I
| {{green|+100}}
| {{green|+250}}
| {{green|+100}}
| 0
| 0
| style="text-align: left; | 
* {{icon|influence}} 200 Influence if not crisis level 5
* {{icon|alloys}} 5000 Alloys if not crisis level 5
* {{icon|dark matter}} 10000 Dark Matter if crisis level 5
| style="text-align: left; | None
|-
| II
| {{green|+200}}
| {{green|+500}}
| {{green|+150}}
| 0
| 20000
| style="text-align: left; | 
* {{icon|influence}} 300 Influence if not crisis level 5
* {{icon|alloys}} 7500 Alloys if not crisis level 5
* {{icon|dark matter}} 15000 Dark Matter if crisis level 5
| style="text-align: left; | Entering the Shroud displays a new set of messages
|-
| III
| {{green|+400}}
| {{green|+1000}}
| {{green|+200}}
| {{red|-1000}}
| 30000
| style="text-align: left; | 
* {{icon|influence}} 400 Influence if not crisis level 5
* {{icon|alloys}} 10000 Alloys if not crisis level 5
* {{icon|dark matter}} 20000 Dark Matter if crisis level 5
| style="text-align: left; | 
* Within 1-2 years 5% of the owned systems will be invaded by shroud avatars
|-
| IV
| {{green|+800}}
| {{green|+2000}}
| {{green|+250}}
| {{red|-1000}}
| 40000
| style="text-align: left; | 
* {{icon|influence}} 600 Influence if not crisis level 5
* {{icon|alloys}} 15000 Alloys if not crisis level 5
* {{icon|dark matter}} 30000 Dark Matter if crisis level 5
| style="text-align: left; | 
* Within 1-2 years 10% of the owned systems will be invaded by shroud avatars
* Up to 6 pops with the {{iconify|psionic}} trait die
* Up to 2 leaders with the {{iconify|psychic}} trait die
|-
| V
| -
| -
| -
| -
| 50000
| -
| style="text-align: left; | 
* {{green|Game victory}}
* '''The galaxy is destroyed'''
|}

{{ConceptsNavbox}}
[[Category:游戏概念]]
[[Category:巨型结构]]
[[en:Megastructures]]