编辑“巨型结构”（章节）

== 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|链接=Special:FilePath/Evt_quantum_catapult.png]]
| 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|链接=Special:FilePath/Fleet_action_button_quantum_catapult.png]] {{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|链接=Special:FilePath/Fleet_action_button_quantum_catapult.png]] {{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|链接=Special:FilePath/Fleet_action_button_quantum_catapult.png]] {{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|链接=Special:FilePath/Origins_slingshot_to_the_stars.png]] '''Restored (8 Lenses)'''
|[[File:Fleet_action_button_quantum_catapult.png|24px|链接=Special:FilePath/Fleet_action_button_quantum_catapult.png]] {{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|链接=Special:FilePath/Origins_slingshot_to_the_stars.png]] Slingshot to the Stars origin
* Any [[File:Origins slingshot to the stars.png|24px|链接=Special:FilePath/Origins_slingshot_to_the_stars.png]] 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|链接=Special:FilePath/Origins_slingshot_to_the_stars.png]] '''Improved (Complete)'''
|[[File:Fleet_action_button_quantum_catapult.png|24px|链接=Special:FilePath/Fleet_action_button_quantum_catapult.png]] {{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|链接=Special:FilePath/Origins_slingshot_to_the_stars.png]] 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|链接=Special:FilePath/Origins_slingshot_to_the_stars.png]] 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]]
说明	输入内容	输出结果
斜体	''斜体文字''	斜体文字
粗体	'''粗体文字'''	粗体文字
粗斜体	'''''粗斜体文字'''''	*粗斜体文字*