Megastructures

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This article has been verified for the current PC version (2.7) of the game.
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[edit]

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 textures depending on the empire that built or repaired them.

Construction Speed Bonuses[edit]

A few bonuses affect megastructure construction speed. These are highly desirable considering the great time requirements of such projects:

  • Master Builders Master Builders ascension perk increases the build speed by +50%
  • Menu icon policies and edicts.png Living Metal Mega-Construction edict increases the build speed by +50%
  • Menu icon policies and edicts.png Architectural Renaissance unity ambition also increases the build speed by +50%
  • R contingency core.png Using the Isolated Contingency Core relic greatly increases the build speed by +300% for 10 years

Gateways[edit]

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 Tech gateway activation.png Gateway Activation technology to appear, which is required to reactivate them.

Reactivation of an abandoned gateway takes 2 years and costs 6000 Energy Credits.png energy and 2500 Alloys.png 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 Tech gateway construction.png Gateway Construction 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.

Each system can only have one Gateway. They can be constructed in a system with an L-Gate. The construction site must be built outside the system gravity well and is built in 3 years and costs 100 Influence.png influence and 2500 Alloys.png alloys. Upgrading it into a fully functional Gateway takes 5 years and costs 6000 Energy Credits.png energy and 2500 Alloys.png alloys.

Gateways can't be used to travel to another Gateway if the later is owned by an Empire that has closed their border to them. Regular Empires cannot close their borders to Fallen Empires, meaning that their Gateways can always be accessed by the Fallen Empires. Systems with gateways count as bordering for the purposes of diplomacy, so every opened gate increases diplomatic tension between all active gate-owners. Claims cannot be extended through gateways. Additionally, gateways are able to greatly enhance and simplify trade infrastructure.

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

Habitats[edit]

Mammalian size 8 habitat

Artificial planets in all but name, habitats have a 70% Mod habitability.png Base Habitability for all species that can be built above planets. Habitats have a unique set of Districts distinct from normal planetary ones. Up to 3 Districts are shared among all Habitats, with a fourth one being available if the Habitat is built above a planet with a resource deposit. Its appearance is dependent on the builders' empire appearance. They still requires colonization but the colony develops 3 times faster on a Habitat.

Habitats can be researched and built by any empire if Utopia.png Utopia DLC is installed. Otherwise, it's only available to empires with the Origin void dwellers.png Void Dwellers origin, which requires the Federations Federations DLC.

Habitats can be built by a construction ship around any regular 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 4 size, which means they can hold up to 4 districts. They can be upgraded via Decisions once all district slots were filled, and goes up to 8 size.

Size Cost Time Housing buildings Required technology
4 Influence.png 150
Alloys.png 1500
1800 days Gestalt consciousness.png Gestalt Consciousness only Tech habitat.png Orbital Habitats
6 Alloys.png 1000 720 days Yes.png Tech habitat 2.png Habitat Expansion
8 Alloys.png 1500 1440 days Yes.png Tech habitat 3.png Advanced Space Habitation

In addition, the Voidborne Voidborne Ascension Perk increases their Mod habitability.png Habitability by +20% (resulting in 90% Habitability without other modifiers) and unlock 2 building slots.

Habitats can be overrun by a Colossus as well as Crisis factions and cannot be rebuilt once destroyed.

Multi-stage megastructures[edit]

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 use it if they conquered one from another Empire, but they cannot upgrade it before they researched the technology. They 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 +1 for each of the following:

  • Ap master builders.png Master Builders ascension perk
  • Menu icon policies and edicts.png Architectural Renaissance ambition edict
  • Federation research.png Level 5 Research Cooperative president

Multi-stage megastructures 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, the ones conquered from other Empires as well as the ruined and restored ones found in the galaxy do not count against the limit. A system can also only host one of them.

Ring Worlds can have their habitable segments overran by a Colossus as well as Crisis factions and cannot be repaired again. Other multi-stage megastructures can't be destroyed or deactivated.

Megastructure Stage Production Upkeep Time Cost Notes AP DLC
Ring World
Evt Ringworld.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 5000
  • Cannot be built in systems with black holes or multiple stars
  • Cannot be built if there are habitable planets, anomalies or stations present
  • All habitable segments feature +100% Mod habitability.png Fixed Habitability for each species, can build up to 5 unique Districts and have their own unique Designations
  • If built in the L-Cluster the uninhabitable segments may have Nanites.png Nanites deposits
  • 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
Ap galactic wonders.png Utopia.png
Stage I (Frame) None None Time 13.3 years Alloys.png 10000
Stage II (1 Segment) Planet ringworld.png +1 Habitable Segment None Time 10 years Alloys.png 10000
Stage III (2 Segments) Planet ringworld.png +2 Habitable Segments None Time 10 years Alloys.png 10000
Stage IV (3 Segments) Planet ringworld.png +3 Habitable Segments None Time 10 years Alloys.png 10000
Stage V (Completed) Planet ringworld.png +4 Habitable Segments None Time 10 years Alloys.png 10000
Dyson Sphere
Evt Dyson Sphere.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 5000
  • Can only be constructed around regular stars
  • 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 PM Terraforming Candidate.png Terraforming Candidate modifier it is removed
Ap galactic wonders.png Utopia.png
Stage I (Frame) None None Time 10 years Alloys.png 10000
Stage II (Partial 25%) Energy Credits.png +1000 Energy None Time 10 years Alloys.png 10000
Stage III (Partial 50%) Energy Credits.png +2000 Energy None Time 10 years Alloys.png 10000
Stage IV (Partial 75%) Energy Credits.png +3000 Energy None Time 10 years Alloys.png 10000
Stage V (Completed) Energy Credits.png +4000 Energy None Time 10 years Alloys.png 10000
Science Nexus
Evt Science Nexus.png
Site None Energy Credits.png -25 Time 5 years Influence.png 300
Alloys.png 5000
  • The final stage of a Science Nexus can be upgraded to produce 50 more Research.png Research through an event that has a 30% chance to trigger a short time after the Megastructure is finished
Utopia.png
Stage I (Hub) Research.png +100 Research
Mod country all tech research speed.png +5% Research Speed
Energy Credits.png -50 Time 10 years Alloys.png 15000
Stage II (Research Wings) Research.png +200 Research
Mod country all tech research speed.png +10% Research Speed
Energy Credits.png -75 Time 10 years Alloys.png 15000
Stage III (Completed) Research.png +300 Research
Mod country all tech research speed.png +15% Research Speed
Energy Credits.png -100 Time 10 years Alloys.png 15000
Sentry Array
Evt Sentry Array.png
Site None Energy Credits.png -20 Time 5 years Influence.png 300
Alloys.png 5000
  • 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
Utopia.png
Stage I (Sentry Hub) Mod planet sensor range mult.png +20 Hyperlane Scanner Range Energy Credits.png -40 Time 5 years Alloys.png 10000
Stage II (Sentry Spire) Mod planet sensor range mult.png +40 Hyperlane Scanner Range Energy Credits.png -60 Time 5 years Alloys.png 10000
Stage III (Sentry Aerials) Mod planet sensor range mult.png +60 Hyperlane Scanner Range Energy Credits.png -80 Time 5 years Alloys.png 10000
Stage IV (Completed) Mod planet sensor range mult.png Entire Galaxy Hyperlane Scanner Range Energy Credits.png -100 Time 5 years Alloys.png 10000
Matter Decompressor
Evt Matter Decompressor.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 5000
  • Can only be constructed around black holes
  • If the black hole has a research station it is removed when the megastructure is completed
Ap galactic wonders.png MegaCorp.png
Stage I (Anchor) Minerals.png +500 Minerals Energy Credits.png -25 Time 10 years Alloys.png 12500
Stage II (Lensing) Minerals.png +1000 Minerals Energy Credits.png -50 Time 10 years Alloys.png 12500
Stage III (Boring) Minerals.png +1500 Minerals Energy Credits.png -75 Time 10 years Alloys.png 12500
Stage IV (Completed) Minerals.png +2000 Minerals Energy Credits.png -100 Time 10 years Alloys.png 12500
Mega Art Installation
Evt Mega Art Installation.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 5000
  • The final stage requires the Ancient Relics.png Ancient Relics DLC and is not available to Xenophobe.pngFanatic Xenophobe.png Xenophobe Empires
  • A ruined Mega Art Installation will be repaired to stage 3 and can be upgraded to stage 4 as with the constructed version
MegaCorp.png
Stage I (Nascency) Unity.png +100 Unity
Amenities.png +5% Amenities
Energy Credits.png -10 Time 10 years Alloys.png 15000
Stage II (Maturity) Unity.png +200 Unity
Amenities.png +10% Amenities
Energy Credits.png -20 Time 10 years Alloys.png 15000
Stage III (Completed) Unity.png +300 Unity
Amenities.png +15% Amenities
Energy Credits.png -30 Time 10 years Alloys.png 15000
Stage IV (Perfection) Unity.png +400 Unity
Amenities.png +20% Amenities
Energy Credits.png -30 Time 10 years Arcane technology.png 100
Strategic Coordination Center
Evt Strategic Coordination Center.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 5000
MegaCorp.png
Stage I (Hull) Mod fleet size add.png +50 Naval Capacity
Spaceport 1.png +2 Starbase Capacity
Spaceport 1.png +4 Defense Platforms
Mod ship speed mult.png +5% Sublight Speed
Energy Credits.png -25 Time 10 years Alloys.png 15000
Stage II (Comms) Mod fleet size add.png +100 Naval Capacity
Spaceport 1.png +4 Starbase Capacity
Spaceport 1.png +8 Defense Platforms
Mod ship speed mult.png +10% Sublight Speed
Energy Credits.png -50 Time 10 years Alloys.png 15000
Stage III (Completed) Mod fleet size add.png +150 Naval Capacity
Spaceport 1.png +6 Starbase Capacity
Spaceport 1.png +12 Defense Platforms
Mod ship speed mult.png +15% Sublight Speed
Energy Credits.png -75 Time 10 years Alloys.png 15000
Interstellar Assembly
Evt Interstellar Assembly.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 5000
MegaCorp.png
Stage I (Locus) Diplomatic weight.png +10% Diplomatic Weight
Diplomacy opinion.png +10 Opinion from all empires
Energy Credits.png -10 Time 5 years Alloys.png 10000
Stage II (Consul Ring) Diplomatic weight.png +20% Diplomatic Weight
Diplomacy opinion.png +10 Opinion from all empires
Envoy.png +1 Available Envoys
Energy Credits.png -20 Time 5 years Alloys.png 10000
Stage III (Forum Modules) Diplomatic weight.png +30% Diplomatic Weight
Diplomacy opinion.png +30 Opinion from all empires
Envoy.png +1 Available Envoys
Energy Credits.png -30 Time 5 years Alloys.png 10000
Stage IV (Completed) Diplomatic weight.png +40% Diplomatic Weight
Diplomacy opinion.png +40 Opinion from all empires
Envoy.png +2 Available Envoys
Energy Credits.png -40 Time 5 years Alloys.png 10000
Mega Shipyard
Evt Megashipyard.png
Site None Energy Credits.png -5 Time 5 years Influence.png 300
Alloys.png 3000
  • All ships start with 100 experience
  • Can only be built around star, in one-star systems, and there is no research station/mining station on it.
  • Can be built in the same system with one other Megastructure site: Dyson Sphere excluded.
  • Once complete can build Titans, Colossi, and Juggernauts as if it had Titan Yards and Colossus Yards
Federations
Stage I (Framework) Sb shipyard.png +5 Shipyard Capacity
Mod ship build speed mult.png +33% Empire Ship Build Speed
Energy Credits.png -10 Time 5 years Alloys.png 10000
Stage II (Core) Sb shipyard.png +10 Shipyard Capacity
Mod ship build speed mult.png +66% Empire Ship Build Speed
Energy Credits.png -20 Time 5 years Alloys.png 10000
Stage III (Complete) Sb shipyard.png +20 Shipyard Capacity
Mod ship build speed mult.png +100% Empire Ship Build Speed
Sb colossus assembly yard.png Titan, Colossus, and Juggernaut construction
Energy Credits.png -40 Time 5 years Alloys.png 10000

Ruined megastructures[edit]

Ruined Dyson Sphere

A ruined version of a multi-stage megastructure can be found while exploring the galaxy, with the larger galaxies having a chance to spawn more ruined megastructures. Repairing them only requires the Tech mega engineering.png Mega-Engineering technology. If not yet researched, owning a system with a ruined megastructure also grants a x20 weight for Tech mega engineering.png Mega-Engineering 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.

Ruined Megastructure Time Time Alloys.png Alloys System notes
Dyson Sphere 7200 20000
Science Nexus 4800 15000
Sentry Array 4800 15000 Contains a Tomb World
Matter Decompressor 4800 20000
Mega Art Installation 4800 20000 Is always a trinary system
Strategic Coordination Center 4800 15000
Interstellar Assembly 3600 15000 Contains deposits on most celestial bodies
Mega Shipyard 3600 10000

Conquerable Ringworlds[edit]

Up to 8 ringworlds can spawn naturally in a game in various states. Damaged segments can be repaired with the Tech mega engineering.png Mega-Engineering 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 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 Utopia.png Utopia DLC is activated. It is completely ruined and each section requires repairing. If the Distant Stars.png Distant Stars DLC is activated as well the system has a 50% chance to contain an unique anomaly.
  • 3 in the systems of the Ancient Caretakers if Synthetic Dawn.png 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 Shattered Ring 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.
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