编辑“巨型结构”

{{version|3.4}}
[[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. They cannot be built in orbit of a celestial body that has an uninvestigated anomaly. All megastructures except Gateways are destroyed if a Star-Eater destroys the system.

== 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.

=== Construction speed bonuses ===
A few bonuses affect megastructure construction speed. These are highly desirable considering the great time requirements of such projects:
* {{iconify|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]] The Isolated Contingency Core relic triumph increases the build speed by {{green|+300%}} for 10 years

== FTL megastructures ==
{{SVersion|3.4}}
[[File:Distant Stars Loading Screen.png|thumb|300px|Real scale of a Gateway]]
[[File:Hyper relay scale.jpg|thumb|300px|Real scale of a Hyper Relay]]
FTL megastructures can only be constructed at the edge of a system and allow fleets to traverse to an identical megastructure, greatly easing travel across the galaxy. They will work together with the FTL megastructures of another empire unless borders are closed or the empires are at war with each other. FTL megastructures can be constructed in any system which doesn't already have that type of megastructure. Unlike other megastructures, they can be constructed in the systems of subjects as well.

=== Gateways ===
While exploring the galaxy, empires may find abandoned gateways that were once part of a massive, galaxy-spanning network. The number of abandoned gateways can be scaled by [[Game settings#Game Details|galaxy settings]].<ref>Setting abandoned gateways to 0 will block the use of gateway technology as an empire must discover at least one gateway to unlock the research. The Galactic Doorstep origin will still spawn a pair of abandoned gateways if the setting is otherwise 0.</ref>

Once an abandoned gateway is discovered, the {{iconify|Gateway Activation|24px}} technology will always have a chance to appear, which allows abandoned gateways to be repaired. Repairing an abandoned gateway takes 2 years and costs {{iconify|energy||6000|red}} and {{iconify|alloys||2500|red}}. When a gateway is reactivated for the first time in the galaxy, another random gateway will also reactivate along with it.

Once the {{iconify|Gateway Activation|24px}} technology is researched, the {{iconify|Gateway Construction|24px}} technology will always have a chance to appear, which allows new gateways to be constructed. The construction site is built in 3 years and costs {{iconify|influence||75|red}} and {{iconify|alloys||2500|red}}. Upgrading it into a fully functional Gateway takes 3 years and costs {{iconify|energy||6000|red}} and {{iconify|alloys||2500|red}}.

Gateways allow travel to any other gateway instantly, so long as the borders are open and the destination is not controlled by an enemy empire. As a [[bypass]], Gateways generally act like a hyperlane connection between systems, such that [[claims]] and [[trade]] can be extended through them, however [[sectors]] don't extend through gateways.

{{expansion|dst}}
[[L-Gate]]s are a special type of gateway, which have a separate network from regular gateways. Instead of jumping from any to any, L-Gates all jump to the Terminal Egress system in the L-Cluster, then from their to any other L-Gate so long as its borders are open, or you are at war. L-Gates are opened through a special project, and new L-Gates cannot be constructed.

=== Hyper Relays ===
{{expansion|ovl}}
Hyper Relays can be constructed once the {{iconify|Hyper Relays|24px|suf=tech}} technology is researched and allow ships to jump to Hyper Relays in adjacent systems instead of using the existing hyperlane connections, therby avoiding having to traverse systems at sublight speeds. They are constructed directly in a single stage, taking one year and costing {{iconify|influence||25|red}}, {{iconify|alloys||500|red}}, and {{iconify|rare crystals||100|red}}. Hyper Relay links are shown on the galaxy map as a thicker hyperlane. Potential (inactive) links are shown as yellow connections on the galaxy map. A link may be inactive because of closed borders, war, or if the relay is ruined. A ruined Hyper Relay can be restored for {{iconify|energy||500|red}}, {{iconify|alloys||500|red}}, and {{iconify|rare crystals||100|red}}, taking 6 months to complete.

Hyper Relays can grant additional effects based on {{iconify|edict}}s and [[Subject empire#Specialized subjects|subject specializations]]. Hyper Relay edicts require the empire's capital system to be part of the network, while the benefits granted by subject specializations require a connection between the overlord's capital and the subject's capital. Subjects do not benefit from their overlord's network effects.

Hyper Relays can be built from the galaxy view, and will be placed semi-randomly within the system. In systems with [[wormholes]] or existing gateways, it is recommended to go into the system view to manually place the Hyper Relay near to the wormhole or gateway to better facilitate travel. However, Hyper Relays cannot connect through wormholes or gateways.

== Orbital megastructures ==
{{SVersion|3.4}}
Orbital megastructures can only be constructed in orbit of a planet. Unlike other megastructures, orbital ones do not require a construction site and are finished in a single stage by the construction ship. Each planet can only have one orbital megastructure, which can be further upgraded. Their appearance is dependent on the builder empire's ship set.

=== Habitats ===
[[File:Plantoid Habitat.png|thumb|Plantoid size 4 habitat]]
Artificial planets in all but name, habitats have a {{green|70%}} {{iconify|habitability||base}} for all species and can be built above planets. Habitats have a unique set of [[Districts#Habitat districts|districts]] distinct from normal planetary ones. Up to 4 district types are available on all habitats, with a fifth one being available if the habitat is built above a planet with a resource deposit. Building a habitat above such a planet leaves you unable to exploit its resource directly, destroying any mining or research station if one was present; however, {{iconify|strategic resources}} are added to the habitat as a special deposit, so they are not lost. Habitats still require [[colonization]], but the colony develops twice as fast on a habitat. Habitats start at {{iconify|size|pre=planet}} 4, which means they can hold up to 4 districts. They can be upgraded twice via decisions once all district slots are filled, up to size 8.

Habitats can be researched and built by any empire if the {{iconify|Utopia}} DLC is enabled. Otherwise, they are only available to empires with the {{iconify|Void Dwellers}} origin, which requires the {{iconify|Federations}} DLC. 
{| class="mildtable"
! {{iconify|Size|pre=planet}}
! Cost
! Time
! Housing buildings
! Required technology
|-
| 4
| {{icon|influence}} 150<br>{{icon|alloys}} 1500
| 1800 days
| {{iconify|Gestalt Consciousness}} only
| {{iconify|Orbital Habitats|24px}}
|-
| 6
| {{icon|alloys}} 1000
| 720 days
| {{icon|yes}}
| {{iconify|Habitat Expansion|24px}}
|-
| 8
| {{icon|alloys}} 1500
| 1440 days
| {{icon|yes}}
| {{iconify|Advanced Space Habitation|24px}}
|}

The {{iconify|Voidborne}} ascension perk adds {{iconify|habitability||+20%|green}} to habitats (resulting in {{green|90%}} habitability without other modifiers) and unlocks {{iconify|building slots||+2|green}}.

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

If the {{iconify|Apocalypse}} DLC is enabled, 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 enabled. These habitats can be captured by other empires.

=== Orbital Rings ===
{{expansion|ovl}}{{expand|with="Orbital Ring modules"}}
Half megastructure and half starbase, Orbital Rings require the planet to be colonized before they can be built. They protect the planet from being invaded and can do everything a starbase can.
{| class="mildtable plainlist"
! Tier
! {{iconify|Alloys}} cost
! {{iconify|Influence}} cost
! {{iconify|Time}}
! {{icon|energy}} Upkeep
! Modules
! Buildings
! [[File:Mod starbase defense platform capacity mult.png|24px|link=Starbase#Defenses|Defense platform cap]] Platforms
! {{icon|health}} Hull
! {{iconify|Armor}}
! Weapons range
! Weapons
! Utilities
! Requirements
|-
| 1
| 1000
| 50
| 720
| {{red|2}}
| 2
| 0
| 2
| 5000
| 1000
| 100%
| 
* {{icon|slot l}} 1
* {{icon|slot m}} 3
| 
* {{icon|slot l}} 2
* {{icon|slot a}} 1
| [[File:Tech_orbital_ring_tier_1.png|24px]] Orbital Rings technology
|-
| 2
| 1500
| 100
| 900
| {{red|3}}
| 3
| 1
| 4
| 10000
| 2000
| 150%
| 
* {{icon|slot l}} 2
* {{icon|slot m}} 6
| 
* {{icon|slot l}} 4
* {{icon|slot a}} 1
| 
* {{icon|building}} Capital tier 2 ''or''
* [[File:Button upgrade ascension tier.png|24px|link=Designation#Planetary ascension]] Planetary Ascension tier 3
|-
| 3
| 2000
| 150
| 1080
| {{red|4}}
| 4
| 2
| 6
| 20000
| 2000
| 200%
| 
* {{icon|slot l}} 3
* {{icon|slot m}} 9
| 
* {{icon|slot l}} 6
* {{icon|slot a}} 1
| 
* {{icon|building}} Capital tier 3 ''or''
* [[File:Button upgrade ascension tier.png|24px|link=Designation#Planetary ascension]] Planetary Ascension tier 5
|}

In addition to the regular [[Starbase#Buildings|starbase buildings]], Orbital Rings can construct a set of buildings that improve the planet's output. All of them take one year to build.
{| class="mildtable plainlist"
! width=1% | !! Building !! Cost !! Upkeep !! Effects !! Required technology !! width=35% | Description
|- id="Climate Optimization Stations"
| [[File:Orbitalring food hub.png]] || Climate Optimization Stations
| 
* {{icon|alloys}} 100
* {{icon|volatile motes}} 100
| 
* {{icon|energy}} {{red|2}}
* {{icon|volatile motes}} {{red|1}}
| {{icon|pop food}} {{green|+2}} Food from Farmers
| {{iconify|Advanced Food Processing|24px}}
| ''Detailed monitoring of local conditions means we can influence the planet's climate at a regional level, increasing agricultural yields.''
|- id="Low Gravity Mega-Refiners"
| [[File:Orbitalring mineral hub.png]] || Low Gravity Mega-Refiners
| 
* {{icon|alloys}} 100
* {{icon|volatile motes}} 100
| 
* {{icon|energy}} {{red|2}}
* {{icon|volatile motes}} {{red|1}}
| {{icon|pop min}} {{green|+2}} Minerals from Miners
| {{iconify|Advanced Mineral Purification|24px}}
| ''Centralizing mineral refining operations on the Orbital Ring allows for novel techniques that increase mining efficiency.''
|- id="Stratospheric Ionization Elements"
| [[File:Orbitalring energy hub.png]] || Stratospheric Ionization Elements
| 
* {{icon|alloys}} 100
* {{icon|exotic gases}} 100
| 
* {{icon|alloys}} {{red|2}}
* {{icon|exotic gases}} {{red|1}}
| {{icon|pop enc}} {{green|+2}} Energy Credits from Technicians
| {{iconify|Planetary Power Grid|24px}}
| ''These devices dramatically reduce power loss during distribution, increasing overall generator output.''
|- id="The Giga-Mall"
| [[File:Orbitalring trade hub.png]] || The Giga-Mall
| 
* {{icon|alloys}} 100
* {{icon|rare crystals}} 100
| 
* {{icon|energy}} {{red|2}}
* {{icon|rare crystals}} {{red|1}}
| 
* {{iconify|Amenities||+1|green}} from Clerks
* {{iconify|Trade Value||+5%|green}}
| {{iconify|Interstellar Economics|24px}}
| ''Moving all shopping and trade facilities to the Orbital Ring means our Clerks can facilitate more business, more effectively than ever before.''
|- id="Alloy Processing Facilities"
| [[File:Orbitalring alloy hub.png]] || Alloy Processing Facilities
| 
* {{icon|alloys}} 200
* {{icon|volatile motes}} 300
| 
* {{icon|energy}} {{red|5}}
* {{icon|volatile motes}} {{red|2}}
| 
* {{iconify|Alloys||+1|green}} from Metallurgists
* {{icon|minerals}} {{red|-2}} Minerals from Metallurgists
| {{iconify|Nano-Separators|24px}}
| ''Alloys from the surface are further processed in orbit, creating usable materials from what would otherwise be wasted by-products.''
|- id="Orbital Logistics Systems"
| [[File:Orbitalring consumer hub.png]] || Orbital Logistics Systems
| 
* {{icon|alloys}} 200
* {{icon|rare crystals}} 300
| 
* {{icon|energy}} {{red|5}}
* {{icon|rare crystals}} {{red|2}}
| 
* {{iconify|Consumer Goods||+1|green}} from Artisans
* {{icon|minerals}} {{red|-1}} Minerals from Artisans
| {{iconify|Replicator Kiosks|24px}}
| ''Transferring logistics operations to automated systems on the Orbital Ring allows planetside Factories to run continuously at full speed.''
|- id="Orbital Filing System"
| [[File:Orbitalring bureaucracy hub.png]] || Orbital Filing System
| 
* {{icon|alloys}} 200
* {{icon|rare crystals}} 300
| 
* {{icon|energy}} {{red|2}}
* {{icon|rare crystals}} {{red|1}}
| {{iconify|Unity||+1|green}} from Bureaucrats, Priests and Telepaths
| {{iconify|Effective Bureaucracy|24px}}
| ''Efficiency and progress can be ours once more, now that our Administrators have near instant access to the paperwork that defines their lives.''
|- id="Synaptic Relays"
| [[File:Orbitalring synapse hub.png]] || Synaptic Relays
| 
* {{icon|alloys}} 200
* {{icon|exotic gases}} 300
| 
* {{icon|alloys}} {{red|2}}
* {{icon|exotic gases}} {{red|1}}
| {{iconify|Amenities||+1|green}} from Synapse Drones
| {{iconify|Clustered Synapses|24px}}
| ''Portions of the Orbital Ring have been modified to enhance synaptic signals, improving control over drones on the surface.''
|- id="Orbital Maintenance Drops"
| [[File:Orbitalring maintenance hub.png]] || Orbital Maintenance Drops
| 
* {{icon|alloys}} 200
* {{icon|exotic gases}} 300
| 
* {{icon|alloys}} {{red|2}}
* {{icon|exotic gases}} {{red|1}}
| {{iconify|Amenities||+1|green}} from Maintenance Drones
| {{iconify|Resource Processing Algorithms|24px}}
| ''Prepackaged pods of maintenance material - and the drones necessary to distribute them - can be dropped from orbit anywhere they are needed, at a moment's notice.''
|}

== Multi-stage megastructures ==
{{SVersion|3.4}}
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 which 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. 

Only one multi-stage megastructure may be built in each system. Multi-stage megastructures must be built either over an uninhabitable planet or the central star of the system (with the exception of the Quantum Catapult). There must not be an anomaly present on the planet or star, but an anomaly on another planet or star in the system will not block construction (even for the Ring World).

It is only possible to build, upgrade, or restore one multi-stage megastructure at a time. The limit can be increased by {{green|+1}} with each of the following:
* {{iconify|Master Builders}} ascension perk
* {{icon|edict}} Architectural Renaissance ambition edict
* {{iconify|Research Cooperative||Level 5}} president

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 or destroyed. 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 this limit. A conquered incomplete megastructure can still be upgraded as long as the new owner has the requisite technology.

Ring Worlds can have their habitable segments overrun by a [[Ship#Colossi|Colossus]] as well as [[Crisis]] factions and cannot be repaired again. All multi-stage megastructures can be permanently ruined if the system is destroyed by a Star Eater.
{| class="wikitable mildtable" cellspacing="2" cellpadding="4" 
! width=1% | Megastructure
! Stage
! Production
! Upkeep
! Time
! Cost
! style="width:35%" | Notes
! {{Hover box|Ascension Perk|AP}}
! {{Hover box|Downloadable 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 days|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" | 
* Cannot be built around a black hole, or in systems with multiple stars or without planets or asteroids
* Cannot be built if there are habitable planets, including habitats, present
* All habitable segments feature {{iconify|habitability||100%|green}} for all species, can build up to 10 [[Districts#Ring World districts|unique districts]], and have their own unique [[Designation#Ringworld designations|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" | {{icon|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 single stars
* Cannot be built if there are habitable planets or anomalies 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" | {{icon|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|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Partial 25%)'''
| {{iconify|Energy||+1000|green}}
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Partial 50%)'''
| {{iconify|Energy||+2000|green}}
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (Partial 75%)'''
| {{iconify|Energy||+3000|green}}
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage V (Completed)'''
| {{iconify|Energy||+4000|green}}
| None
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{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 days|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)'''
| {{iconify|Research||+100|green}}<br>{{iconify|Research Speed||+5%|green}}
| {{icon|energy}} {{red|−50}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage II (Research Wings)'''
| {{iconify|Research||+200|green}}<br>{{iconify|Research Speed||+10%|green}}
| {{icon|energy}} {{red|−75}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage III (Completed)'''
| {{iconify|Research||+300|green}}<br>{{iconify|Research Speed||+15%|green}}
| {{icon|energy}} {{red|−100}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{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 days|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>{{iconify|Base intel level||+10|green}}
| {{icon|energy}} {{red|−40}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Sentry Spire)'''
| {{icon|sensor range}} {{green|+40}} Hyperlane Scanner Range<br>{{iconify|Base intel level||+20|green}}
| {{icon|energy}} {{red|−60}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Sentry Aerials)'''
| {{icon|sensor range}} {{green|+60}} Hyperlane Scanner Range<br>{{iconify|Base intel level||+30|green}}
| {{icon|energy}} {{red|−80}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (Completed)'''
| {{icon|sensor range}} {{green|Entire Galaxy}} Hyperlane Scanner Range<br>{{iconify|Base intel level||+40|green}}
| {{icon|energy}} {{red|−100}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{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 days|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
* Cannot be built if there are habitable planets or anomalies 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" | {{icon|Galactic Wonders}}
| rowspan=5 style="border-top:2px solid black" | {{icon|mgc}}
|- 
| '''Stage I (Anchor)'''
| {{iconify|Minerals||+500|green}}
| {{icon|energy}} {{red|−25}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|12500}}
|- 
| '''Stage II (Lensing)'''
| {{iconify|Minerals||+1000|green}}
| {{icon|energy}} {{red|−50}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|12500}}
|- 
| '''Stage III (Boring)'''
| {{iconify|Minerals||+1500|green}}
| {{icon|energy}} {{red|−75}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{icon|alloys}} {{red|12500}}
|- 
| '''Stage IV (Completed)'''
| {{iconify|Minerals||+2000|green}}
| {{icon|energy}} {{red|−100}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|5000}}<br>{{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 days|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)'''
| {{iconify|Unity||+100|green}}<br>{{iconify|Amenities||+5%|green}}
| {{icon|energy}} {{red|−10}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage II (Maturity)'''
| {{iconify|Unity||+200|green}}<br>{{iconify|Amenities||+10%|green}}
| {{icon|energy}} {{red|−20}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage III (Completed)'''
| {{iconify|Unity||+300|green}}<br>{{iconify|Amenities||+15%|green}}
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage IV (Perfection)'''
| {{iconify|Unity||+400|green}}<br>{{iconify|Amenities||+20%|green}}
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{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 days|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)'''
| {{iconify|Naval capacity||+50|green}}<br>{{iconify|Starbase capacity||+2|green|suf=add}}<br>[[File:Mod starbase defense platform capacity mult.png|24px|link=Starbase#Defenses|Defense platform cap]] {{green|+4}} Defense Platforms<br>{{iconify|Sublight speed||+5%|green}}
| {{icon|energy}} {{red|−25}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage II (Comms)'''
| {{iconify|Naval capacity||+100|green}}<br>{{iconify|Starbase capacity||+4|green|suf=add}}<br>[[File:Mod starbase defense platform capacity mult.png|24px|link=Starbase#Defenses|Defense platform cap]] {{green|+8}} Defense Platforms<br>{{iconify|Sublight speed||+10%|green}}
| {{icon|energy}} {{red|−50}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|15000}}
|- 
| '''Stage III (Completed)'''
| {{iconify|Naval capacity||+150|green}}<br>{{iconify|Starbase capacity||+6|green|suf=add}}<br>[[File:Mod starbase defense platform capacity mult.png|24px|link=Starbase#Defenses|Defense platform cap]] {{green|+12}} Defense Platforms<br>{{iconify|Sublight speed||+15%|green}}
| {{icon|energy}} {{red|−75}}
| {{icon|time}} {{Hover box|3 600 days|10 years}}
| {{icon|unity}} {{red|2500}}<br>{{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 days|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>{{iconify|Opinion||+10|green}} from all empires
| {{icon|energy}} {{red|−10}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (Consul Ring)'''
| {{icon|diplo weight mult}} {{green|+20%}} Diplomatic weight<br>{{iconify|Opinion||+20|green}} from all empires<br>{{iconify|Available envoys||+1|green}}
| {{icon|energy}} {{red|−20}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Forum Modules)'''
| {{icon|diplo weight mult}} {{green|+30%}} Diplomatic weight<br>{{iconify|Opinion||+30|green}} from all empires<br>{{iconify|Available envoys||+1|green}}
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- 
| '''Stage IV (Completed)'''
| {{icon|diplo weight mult}} {{green|+40%}} Diplomatic weight<br>{{iconify|Opinion||+50|green}} from all empires<br>{{iconify|Available envoys||+2|green}}
| {{icon|energy}} {{red|−40}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|unity}} {{red|2500}}<br>{{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 100 experience
* Can only be built around stars, in one-star systems
| 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|unity}} {{red|2500}}<br>{{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|unity}} {{red|2500}}<br>{{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|unity}} {{red|2500}}<br>{{icon|alloys}} {{red|10000}}
|- id="Quantum Catapult"
| rowspan=6 style="border-top:2px solid black"| '''Quantum Catapult'''<br>[[File:Evt quantum catapult.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|influence}} {{red|300}}<br>{{icon|alloys}} {{red|5000}}
| rowspan=4 style="border-top:2px solid black" | 
* Can only be constructed around pulsars and neutron stars (including in binary or trinary systems)
* The accuracy of the catapult decreases with distance and is increased by upgrading the megastructure
| rowspan=6 style="border-top:2px solid black" | 
| rowspan=6 style="border-top:2px solid black" | {{icon|ovl}}
|- 
| '''Stage I (4 lenses)'''
| [[File:Fleet_action_button_quantum_catapult.png|24px]] {{Hover box|Distance: 200; Base spread: 60|Can catapult fleets in the system}}<br>{{icon|disengagement chance}} {{green|−10%}} Missing in Action time (requires Hyper Relays)
| {{icon|energy}} {{red|−10}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage II (8 lenses)'''
| [[File:Fleet_action_button_quantum_catapult.png|24px]] {{Hover box|Distance: 350; Base spread: 45|Can catapult fleets in the system}}<br>{{green|−25%}} Catapult windup time<br>{{icon|disengagement chance}} {{green|−20%}} Missing in Action time (requires Hyper Relays)
| {{icon|energy}} {{red|−20}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|alloys}} {{red|10000}}
|- 
| '''Stage III (Complete)'''
| [[File:Fleet_action_button_quantum_catapult.png|24px]] {{Hover box|Distance: 500; Base spread: 30|Can catapult fleets in the system}}<br>{{green|−50%}} Catapult windup time<br>{{icon|disengagement chance}} {{green|−30%}} Missing in Action time (requires Hyper Relays)
| {{icon|energy}} {{red|−30}}
| {{icon|time}} {{Hover box|1 800 days|5 years}}
| {{icon|alloys}} {{red|10000}}
|-
|[[File:Origins slingshot to the stars.png|24px]] '''Restored (8 Lenses)'''
|[[File:Fleet_action_button_quantum_catapult.png|24px]] {{Hover box|Distance: 300; Base spread: 50|Can catapult fleets in the system}}<br>{{icon|disengagement chance}} {{green|−20%}} Missing in Action time (requires Hyper Relays)
|{{icon|energy}} {{red|−20}}
|{{icon|time}} {{Hover box|3 600 days|10 years}}
|{{icon|alloys}} {{red|2500}}
| rowspan="2" |
* Must be restored from the ruined catapult spwned by the [[File:Origins slingshot to the stars.png|24px]] Slingshot to the Stars origin
* Any [[File:Origins slingshot to the stars.png|24px]] Slingshot to the Stars empire can restore the special catapult without {{iconify|Mega-Engineering|24px}}, but requires that technology to improve the catapult; restoring the catapult also unlocks the {{iconify|Quantum Catapult|24px|suf=tech}} technology.
* Other empires can restore the special catapult with {{iconify|Mega-Engineering|24px}}
|-
|[[File:Origins slingshot to the stars.png|24px]] '''Improved (Complete)'''
|[[File:Fleet_action_button_quantum_catapult.png|24px]] {{Hover box|Distance: 500; Base spread: 30|Can catapult fleets in the system}}<br>{{icon|disengagement chance}} {{green|−30%}} Missing in Action time (requires Hyper Relays)
|{{icon|energy}} {{red|−40}}
|{{icon|time}} {{Hover box|3 600 days|10 years}}
|{{icon|alloys}} {{red|15000}}
|}

=== 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 Mega-Engineering to appear. 

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
|- 
| {{icon|utp}} Dyson Sphere || {{hover|20 years|7200}} || 20000 || 
|- 
| {{icon|utp}} Science Nexus || {{hover|13.3 years|4800}} || 15000 ||
|- 
| {{icon|utp}} Sentry Array || {{hover|13.3 years|4800}} || 15000 || Contains a Tomb World
|- 
| {{icon|mgc}} Matter Decompressor || {{hover|13.3 years|4800}} || 20000 || 
|- 
| {{icon|mgc}} Mega Art Installation || {{hover|13.3 years|4800}} || 20000 || Is always a trinary system
|- 
| {{icon|mgc}} Strategic Coordination Center || {{hover|13.3 years|4800}} || 15000 || 
|- 
| {{icon|mgc}} Interstellar Assembly || {{hover|10 years|3600}} || 15000 || Contains deposits on most celestial bodies
|- 
| {{icon|fed}} Mega Shipyard || {{hover|10 years|3600}} || 10000 || 
|-
| {{icon|ovl}} Quantum Catapult || {{hover|10 years|3600}} || 10000 || Is always a pulsar system
|-
| [[File:Origins slingshot to the stars.png|26px]] Quantum Catapult || {{hover|10 years|3600}} || 2500 || Is always a pulsar system next to the origin homeworld
|}
Empires with the [[File:Origins slingshot to the stars.png|24px]] Slingshot to the Stars origin can repair the special Quantum Catapult without the {{iconify|Mega-Engineering|24px}} technology.

=== 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 [[Exploration#Cybrex|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 [[Crisis#The Cybrex|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 the {{iconify|Utopia}} DLC is enabled. It is completely ruined and each section requires repairing. If the {{iconify|Distant Stars}} DLC is enabled as well, the system has a 50% chance to contain a unique anomaly.
* 3 in the systems of the [[Ancient Caretakers]] if the {{iconify|Synthetic Dawn}} DLC is enabled. 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#Galactic_Nemesis|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; | 
* {{iconify|Influence||200|green}} if not crisis level 5
* {{iconify|Alloys||5000|green}} if not crisis level 5
* {{iconify|Dark matter||10000|green}} if crisis level 5
| style="text-align: left; | None
|-
| II
| {{green|+200}}
| {{green|+500}}
| {{green|+150}}
| 0
| 20000
| style="text-align: left; | 
* {{iconify|Influence||300|green}} if not crisis level 5
* {{iconify|Alloys||7500|green}} if not crisis level 5
* {{iconify|Dark matter||15000|green}} 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; | 
* {{iconify|Influence||400|green}} if not crisis level 5
* {{iconify|Alloys||10000|green}} if not crisis level 5
* {{iconify|Dark matter||20000|green}} 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; | 
* {{iconify|Influence||600|green}} if not crisis level 5
* {{iconify|Alloys||15000|green}} if not crisis level 5
* {{iconify|Dark matter||30000|green}} 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'''
|}

<references />
{{ConceptsNavbox}}
[[Category:游戏概念]]
[[Category:巨型结构]]
[[en:Megastructures]]