Starbase

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This article is for the PC version of Stellaris only.
File:Mammalian Bastion.png
Mammalian Bastion Citadel
For the construction of civilian ships see Spaceport.

A starbase is the primary space station used throughout the game. Its main functions are: determining the ownership of star systems, construction of military ships, and strategic fort-like use during warfare.

Mechanics

A starbase's most fundamental function lies in asserting ownership over star systems. Doing so requires fully surveying the desired system and an additional varying Influence.png influence cost (on top of the regular mineral costs). The influence cost is determined by a fixed cost multiplied by the shortest path of hyperlane jumps (gates and wormholes act as "shortcuts") between the target systems and the empire's closest owned system.

Once built, the starbase will appear orbiting the center point of the system. It cannot be destroyed by any regular means, however, it may still be dismantled if it is controlled by its owner, done during peace time, and the starbase in question is an outpost level (may require level downgrading).

Besides the initial influence cost, upgrading the starbase to one of a higher level will cost only minerals and time. Aside from making the starbase more powerful due to better base stats and increased component slots, the upgrade also allows to fit the starbase with different buildings and modules increasing its contribution to the empire beyond its basic role of system control. One such important module is the Spaceport 1.png Shipyard which enables the construction of military ships in the starbase. Having multiples of this module allows a starbase to effectively act as a "fleet manufactory" by constructing several ships simultaneously.

Though it is not possible to design a starbase, its components will be auto-fitted with the latest advanced technology as soon as they are made available (at no additional cost to the owner).

Warfare behavior

Systems with upgraded starbases require higher influence cost to claim (25 influence) than simple outposts. Consequently, those starbases grant a higher war-score if occupied successfully (10 occupation value). An additional benefit of upgraded starbases manifests in them including an FTL inhibitor. Such an upgraded starbase can turn strategically important systems into efficient choke points, delaying hostile fleets from leaving the system and advancing further by forcing them into an engagement which may last long enough for reinforcements to arrive.

During war, it is required to disable the enemy's starbase within the system in order to seize control of their planets. As starbases cannot be destroyed, this is achieved by reducing them to Health 0 Hull points. The starbase will remain incapacitated for a duration of Time 30 days (after the latest attack), during which time allied ships in close proximity to the starbase will be able to gain control over it. If the starbase is left unoccupied and without a ship attacking it from time to time, it will enter a self-repair phase and become operational again as soon as it regains Health 5% Hull points.

Systems containing an unoccupied starbase or unoccupied colonized planets won't be transferred in a forced status-quo peace.

Starbase capacity

Although it is possible for an empire to have a high number of starbases, it can support only a limited number of them above the outpost level. Exceeding the capacity will result in +25% Upkeep Upkeep per starbase exceeding the cap. This is an empire modifier, and thus affects all of that empires starbases, this also factors in the maintenance of any modules and buildings on their starbases. Regardless of their level, each starbase occupies only one capacity slot.

The base capacity limit is set at 3[1]. The capacity limit can be further increased with the following:

Starbase capacity Population Governance Planet Technology
+5
  • Ap reach for the stars.png Grasp the Void
+2
  • Menu icon traditions.png Supremacy tree adoption
  • Tech manifest destiny.png Manifest Destiny
  • Tech galactic ambitions.png Stellar Expansion
+1 Pop.png Per 40 pops
  • Per 20 owned systems
  • Tech repeatable improved starbase capacity.png Interstellar Expansion

Level

A starbase is auto-fitted with the latest components as soon as they are available to the empire. This is done automatically and has no additional cost for the empire - as such this also does not affect a starbase's level upgrade cost.

The weapon slots are fitted with the most effective kinetic and energy weapons (though not necessarily by equal division). The utility slots are divided equally between Shield shield and Armor armor components while the auxiliary slot is always fitted with a shield capacitor (once researched).

Upgrading a starbase can only be done in a sequential order - meaning, one would require to upgrade through all the levels in order to get to the highest level available. Downgrading a starbase, however, reduces its level to the basic level (outpost) straight away - regardless of what level the starbase was - and removes any present buildings, modules, and any defense platforms over the outpost's capacity limit.

Note: The table lists the base properties of each starbase level. The actual values themselves will differ due to one's progress in-game (technology, tradition, and etc.) as well as individual starbase composition (buildings, modules, and etc.).

Starbase Level Cost Slots Military properties Requirements Description
Minerals.png Time Upkeep M B D Health Armor FTL inhibitor Weapons Utilities
Tech starbase 1.png Outpost 1 100 100 1 0 0 3 5000 1000 No.png Medium 0 Guided 1 Large 2 Auxiliary 1
  • Tech starbase 1.png Starbase Construction
  • Influence.png 75 Influence per hyperlane jump (from closest owned system)
The most basic kind of Starbase, Outposts are lightly-armed stations built in stellar orbit to extend national borders. Outposts can not support any Buildings or Modules and are not listed in the Outliner.
Tech starbase 2.png Starport 2 300 360 2 2 1 6 10000 2000 Yes.png Medium 2 Guided 1 Large 6 Auxiliary 1
  • Tech starbase 2.png Starport
  • Spaceport 1.png Outpost
Upgrading the Outpost, Starports can house one Building and support two Modules.
Tech starbase 3.png Starhold 3 750 720 3 4 2 9 20000 5000 Yes.png Medium 4 Guided 1 Large 10 Auxiliary 1
  • Tech starbase 3.png Starhold
  • Spaceport 1.png Starport
Upgrading the Starport, Starholds can house two Buildings and support four Modules.
Tech starbase 4.png Star Fortress 4 2500 1080 4 6 3 12 40000 10000 Yes.png Medium 6 Guided 1 Large 14 Auxiliary 1
  • Tech starbase 4.png Star Fortress
  • Spaceport 1.png Starhold
Upgrading the Starhold, Star Fortresses can house three Buildings and a full complement of six Modules.
Tech starbase 5.png Citadel 5 7500 1440 5 6 4 15 80000 20000 Yes.png Medium 12 Guided 1 Large 26 Auxiliary 1
  • Tech starbase 5.png Citadel
  • Spaceport 1.png Star Fortress
Upgrading the Star Fortress, Citadels are the largest and most heavily fortified type of Starbase and can house four Buildings and a full complement of six Modules.

Affecting modifiers

Additional modifiers which affect various starbase parameters are summarized below:

Construction and maintenance modifiers
Influence.png Outpost influence cost
−50% Civic devouring swarm.png Devouring swarm
−40% Fanatic Xenophobe.png Fanatic xenophobe
−30% Civic machine terminator.png Determined exterminator
−20%
  • Xenophobe.png Xenophobe
  • Ap interstellar dominion.png Interstellar Dominion
−15% Trait ruler expansionist.png Expansionist
−10% Tradition expansion reach for the stars.png Reach for the Stars
−5% Tradition domination star lords.png The Chosen
Cost Outpost build cost
−15% Trait ruler expansionist.png Expansionist
Upkeep Upkeep cost
−20% Tradition expansion galactic ambition.png Galactic Ambition
−10% Tradition prosperity administrative operations.png Administrative Operations
+25% "Exceeding starbase capacity" modifier
Upgrade related modifiers
Cost Upgrade cost
−20% Menu icon traditions.png Supremacy tree adoption
−15% Tech space defense station improvement.png Corps of Engineers
−10%
  • Trait ruler fortifier.png Fortifier
  • Trait ruler home in the sky.png Home in the Sky
Speed Upgrade speed
+100% Menu icon policies and edicts.png Fortress Proclamation
+25% Tech space defense station improvement.png Corps of Engineers
Military properties related modifiers
Damage Damage
+25% Ap eternal vigilance.png Eternal Vigilance
Health Hull points
+10%
  • Spaceport 1.png Gun Battery
  • Spaceport 1.png Hangar Bay
  • Spaceport 1.png Missile Battery
  • Tradition domination fleet levies.png Never Surrender
Armor Armor hit points
+10%
  • Spaceport 1.png Gun Battery
  • Spaceport 1.png Hangar Bay
  • Spaceport 1.png Missile Battery

Modules

A fully upgraded starbase can support up to 6 modules. It is possible to construct multiple modules of the same type.

Cost Modifiers affecting module build cost include:

  • −25% Tech modular engineering.png Modular Engineering
  • −20% Trait ruler home in the sky.png Home in the Sky
  • −10% "Zero-G Innovations" modifier
Module Minerals.png Time Upkeep Effects Requirements Description
Sb anchorage.png Anchorage 100 180 1 Mod fleet size add.png +4 Naval capacity Fleet anchorages are necessary to support the growth of our navy.
Sb gun battery.png Gun Battery 200 180 1
  • Medium +2 Medium weapon components
  • Yes.png Starbase and platforms gain:
  • Armor +10% Armor hit points
  • Health +10% Hull points
Tech mass drivers 1.png Mass Drivers Adds two medium-size weapon slots to the Starbase.
Sb hangar bay.png Hangar Bay 200 180 1
  • Hangar +1 Hangar weapon components
  • Yes.png Starbase and platforms gain:
  • Armor +10% Armor hit points
  • Health +10% Hull points
Tech strike craft 1.png Carrier Operations Adds a hangar for strike craft to the Starbase.
Sb missile battery.png Missile Battery 200 180 1
  • Guided +2 Guided weapon components
  • Yes.png Starbase and platforms gain:
  • Armor +10% Armor hit points
  • Health +10% Hull points
Tech missiles 1.png Nuclear Missiles Adds two torpedo weapon slots to the Starbase.
Sb shipyard.png Shipyard 100 180 1 +1 Shipyard capacity increase A Shipyard may build one ship at a time, in parallel with other Shipyards.
Sb trading hub.png Trading Hub 100 180 Energy Credits.png +4 Energy
  • Yes.png System is either:
  • Yes.png Colonized
  • Yes.png Has a trader enclave
A civilian docking area where merchants and traders can conduct business.

Buildings

A fully upgraded starbase can support up to 4 buildings. Unlike modules, it is only possible to construct a single building of any type.

Cost Modifiers affecting starbase building build cost include:

  • −25% Tech modular engineering.png Modular Engineering
Building Minerals.png Time Upkeep Effects Requirements Description
Sb artist college.png Art College 200 360 2 Unity.png +10 Unity
  • Diplomatic trade icon.png A diplomatic agreement with the in-system Artisan enclave
  • No.png Is not:
  • Civic machine terminator.png Determined Exterminator
  • Civic devouring swarm.png Devouring Swarm
  • Civic fanatic purifiers.png Fanatic Purifiers
This zero-g Art College, operated in conjunction with the nearby Artisan Enclave, celebrates the beauty of outer space in the works produced by its talented students.
Observatory.png Black Hole Observatory 200 360 2 Physics Research +10 Physics research
  • Tech sensors 3.png Subspace Sensors
  • Yes.png System contains a black hole
By building a specialized science facility dedicated to studying a black hole, our empire will surely be able to see improvements in our understanding of Physics.
Sb colossus assembly yard.png Colossus Assembly Yards 2000 720 20 Feature Colossus construction enabled in Spaceport 1.png Shipyard
  • Tech colossus.png Colossi
  • Spaceport 1.png Citadel
  • Spaceport 1.png Shipyard
Abandoning the traditional concept of drydocks, Colossi are assembled by a number of highly mobile independent construction platforms.
Sb command center.png Command Center 500 360 5
  • Defensive aura - Command center:
  • Attack Speed +10% Fire rate
  • Tech doctrine command matrix.png Command Matrix
  • Spaceport 1.png Star Fortress
All system defense efforts are coordinated from this large facility, buried deep within the hull of the Starbase. Map arrays and 3D projections track all space traffing passing through the system at any given time.
Sb communication jammer.png Communications Jammer 100 180 1
  • Offensive aura - Communications jammer:
  • –20% Combat disengagement chance
  • Mod ship speed mult.png –20% Sublight speed
These powerful jammers interfere with enemy ship-to-ship communications, making it difficult to coordinate fleet movements.
Crew Quarters.png Crew Quarters 100 180 1 Upkeep –25% Docked ship upkeep Provides accommodation and support for spaceship crews, reducing the logistical burden on fleets that are berthed here.
Sb curator think tank.png Curator Think Tank 200 360 2 Research.png +5 Research
  • Diplomatic trade icon.png A diplomatic agreement with the in-system curator enclave
  • No.png Is not:
  • Civic machine terminator.png Determined Exterminator
  • Civic devouring swarm.png Devouring Swarm
  • Civic fanatic purifiers.png Fanatic Purifiers
By constructing a research facility entirely focused on learning from, and cooperating with, the Curators, we are able to make significant contributions to our scientific progress.
Sb deep space black site.png Deep Space Black Site 200 360 2
  • Unity.png +1 Unity
  • Yes.png System gains:
  • Mod pop government ethic attraction.png +25% Governing ethics attraction
  • Unrest.png –20 Unrest
  • Tech living state.png The Living State
  • Yes.png System is colonized
  • No.pngGestalt consciousness.png Gestalt Consciousness
A large part of this Starbase has been set aside as a Black Site that does not officially exist. The entire system is closely monitored from here, while intelligence operatives carefully manipulate local media and social events to the best of their ability.
Sb defense grid supercomputer.png Defense-Grid Supercomputer 300 360 2 Spaceport 1.png +8 Starbase defense platform capacity Tech synchronized defences.png Synchronized Defenses A powerful supercomputer coordinating the relative orbit and firing arcs of the Starbase's defensive platforms, increasing the number of defensive platforms that can be supported.
Sb disruption field generator.png Disruption Field Generator 200 180 2
  • Offensive aura - Disruption field generator:
  • Shield –20% Shield hit points
Generates localized fields of agitated subatomic particles around hostile ships in the system, significantly reducing the effectiveness of their shields.
Fleet Academy.png Fleet Academy 200 360 2 +100 Ship starting experience
  • Tech interstellar fleet traditions.png Interstellar Fleet Traditions
  • Spaceport 1.png Shipyard
For our newly recruited crews to be truly combat ready, they must have capable officers leading them. The Fleet Academy will ensure those officers have up-to-date knowledge on the doctrines and practice of interstellar warfare.
Sb hydroponics bay.png Hydroponics Bay 100 180 1 Food.png +3 Food No.pngAuth machine intelligence.png Machine Intelligence By dedicating a section of this Starbase to Hydroponic farming, the station will be able to feed itself and even export excess produce to other systems.
Sb hyperlane registrar.png Hyperlane Registrar 200 180 2
  • Defensive aura - Hyperlane registrar:
  • +20% Combat disengagement chance
  • –20% Jump charge time
  • –20% Jump cooldown
Tech hyper drive 2.png Hyperlane Breach Points Assists friendly ships in the system with FTL travel by identifying ideal conditions for entering the hyperlanes and optimizing projected travel routes.
Sb listening post.png Listening Post 200 360 2 +2 Sensor range Tech sensors 2.png Gravitic Sensors The Listening Post houses a team of dedicated operators tasked with analyzing hyperlane reverberations, functionally extending the range of the Starbase's sensors.
Sb nebula refinery.png Nebula Refinery 200 360 2 Minerals.png +5 Minerals
  • Tech mineral purification 1.png Mineral Processing
  • Yes.png System is inside a nebula
By processing the dust clouds of a nebula, we are able to refine and extract valuable minerals.
Sb offworld trading company.png Offworld Trading Company 200 360 Energy Credits.png +2 Energy from Spaceport 1.png Trading Hubs
  • Tech space trading.png Space Trading
  • Spaceport 1.png Trading Hub
The offices of a non-governmental organ dedicated to improving the conditions of interstellar trade.
Sb resource silo.png Resource Silo 100 180
  • Energy Credits.png +2500 Energy storage capacity
  • Minerals.png +2500 Mineral storage capacity
Massive resource silos and energy storage facilities where large quantities of minerals and energy can be safely kept.
Sb titan assembly yard.png Titan Assembly Yards 1000 720 10 Feature Titan construction enabled in Spaceport 1.png Shipyard
  • Tech titans.png Titans
  • Spaceport 1.png Citadel
  • Spaceport 1.png Shipyard
Specialized drydocks erected on the Starbase's hull allow for the construction of gargantuan Titan-class ships.

Defense platforms

A starbase's self-defense capabilities can be further reinforced with the construction of defense platforms. These platforms are smaller military stations deployed around the starbase. They will engage any incoming hostile forces, effectively acting as a buffer, by attacking and distracting them from focusing their efforts on the starbase itself.

As opposed to the auto-fitting of the starbase's components, defense platforms can be altered through the ship designer allowing for several designs to be built based on the different needs in each front.

Each starbase can support only a certain number of defense platforms based on its level. However, the defense platform capacity can be increased with the following:

  • Globally: +5 Ap eternal vigilance.png Eternal Vigilance
  • Locally: +8 Spaceport 1.png Defense-Grid Supercomputer

In addition to the regular defense platforms, a more powerful platform type may be constructed equipped with an Ion Cannon weapon (once the required technology has been researched). This platform type carries a singular weapon, identical to the Perdition Beam weapon and which can not be changed, capable of engaging enemies from further away.

An ion cannon platform occupies 8 defense platform capacity slots and can only be constructed by citadel level starbases.

Defense platform modifiers

Additional modifiers which affect various defense platform parameters are summarized below:

Damage Damage
+25%
  • Ap eternal vigilance.png Eternal Vigilance
  • Agenda Secure the Borders
+10% Tech repeatable improved military station damage.png Synchronized Firing Patterns
Health Hull points
+25% Agenda Secure the Borders
+20% Tradition supremacy right of conquest.png Armed Deterrence
+10%
  • Tech repeatable improved military station health.png Fortified Core Layers
  • Spaceport 1.png Gun Battery
  • Spaceport 1.png Hangar Bay
  • Spaceport 1.png Missile Battery
+500 Tech defense platform hull 1.png Improved Structural Integrity
Armor Armor hit points
+10%
  • Spaceport 1.png Gun Battery
  • Spaceport 1.png Hangar Bay
  • Spaceport 1.png Missile Battery
Cost Build cost
−33% Trait ruler fortifier.png Fortifier
−25% Tradition supremacy right of conquest.png Armed Deterrence
−15% Agenda Secure the Borders
Speed Build speed
+100% Menu icon policies and edicts.png Fortress Proclamation

References

  1. See /Stellaris/common/defines/00_defines.txt for details (under "starbase_capacity").
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