Subject empire

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This article has been verified for the current PC version (3.5) of the game.
Overlord redirects here. For the game expansion, see Overlord (DLC).
Vassalization request towards a Machine Intelligence empire

A subject is an empire that has a special diplomatic relationship with another empire, called the overlord. In the default galaxy map mode, subjects have the same color as their overlord.

An empire can become a subject willingly via diplomacy; the acceptance depends on a number of factors, particularly Relative power icon.png relative power. Additionally, having an overall superior or overwhelming relative power enables an empire to use the Diplomacy status casus belli holder.png Subjugation casus belli to forcefully make another empire a subject.

Subjects, except Diplomacy issatrapy.png Satrapies, receive a −50% penalty to their Diplomatic weight.png diplomatic weight. In addition, operation difficulty is reduced between subjects and their overlord.

If they have fleets available, subjects' fleets tend to follow their overlord's.

Loyalty[edit | edit source]

Subjects have a secondary opinion type towards their overlord called Trade cat loyalty.png Loyalty that ranges from −100 to 100. Subjects with negative loyalty have the Disloyal attitude, which prevents any diplomatic agreements; subjects with positive loyalty have the Loyal attitude, which increases acceptance of diplomatic agreements. Loyalty can also be used as part of trade deals between the overlord and the subject.

Loyalty is gained or lost monthly based on subject's Diplomacy opinion.png opinion and terms of agreements; ethics compatibility, relative power, and overlord holdings have a lesser impact as well. A Trade cat action.png Pledge of Loyalty can also be negotiated via trade, adding Trade cat loyalty.png +1.5 monthly loyalty for the duration of the trade deal; if the subject's Diplomacy opinion.png opinion of the overlord is at least 150, the Pledge of Loyalty adds Trade cat loyalty.png +2.5 monthly loyalty instead.

If an overlord has multiple subjects, each subject gains Trade cat loyalty.png −1 monthly loyalty for every other subject. This penalty can be removed by the Civic feudal realm.png Feudal Society civic, Civic franchising.png Franchising civic, or the Ap shared destiny.png Shared Destiny ascension perk.

Trade cat loyalty.png Loyalty also grants experience to specialized subjects. In addition, the Suzerains and Sovereignty resolutions – Resolution intergalactic directives.png Intergalactic Directives and Resolution bureaucratic surveillance.png Bureaucratic Surveillance – increase or reduce Trade cat loyalty.png monthly loyalty as well.

Terms of agreement[edit | edit source]

All subjects and overlords have an Agreement towards each other, which may include certain obligations for the subject or the overlord. Agreements may only be changed once every 5 years. Reforming the government to add the Civic feudal realm.png Feudal Society or Civic franchising.png Franchising civics removes incompatible terms from all agreements. Many agreement terms are restricted by subject type, primarily Diplomacy istributary.png Tributary, or by the Suzerains and Sovereignty resolutions.

The Influence.png influence cost to propose a change in the Agreement Terms is 50 + 5 for each point of immediate change in Trade cat loyalty.png loyalty; the total change in loyalty is summed across all terms, so that positive and negative changes can "cancel out" their costs.

For example, changing Holdings Limit from 0 to 1 (or vice-versa) changes loyalty by −5 and thus costs an additional Influence.png 25 influence; similarly, changing from Sensors from Independent Sensors to Unified Sensors (or vice-versa) changes loyalty by +5 and so also costs an additional Influence.png 25 influence; however, changing both Holdings Limit from 0 to 1 and Sensors from Independent Sensors to Unified Sensors "cancels out" the total loyalty change and thus costs no additional influence.

Terms Effects Trade cat loyalty.png Immediate Trade cat loyalty.png Monthly Requirements
Subject Integration
Integration Permitted Overlord can use the Integrate Subject interaction −50 −4
  • No.pngResolution intergalactic directives.png Ensured Sovereignty resolution
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy istributary.png Subsidiary
    • No.pngDiplomacy issatrapy.png Satrapy
    • No.pngBulwark Bulwark
    • No.pngProspectorium Prospectorium
    • No.pngScholarium Scholarium
Integration Prohibited Overlord cannot use the Integrate Subject interaction +5 +0.5
Diplomatic Freedom
Limited Diplomacy
  • Subject cannot engage in diplomacy with other empires
  • Subject cannot vote independently
−15 −1
  • No.pngResolution intergalactic directives.png A Voice for All resolution
  • Overlord:
    • No.pngCivic feudal realm.png Feudal Society
    • No.pngCivic franchising.png Franchising
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy istributary.png Subsidiary
    • No.pngDiplomacy issatrapy.png Satrapy
Restricted Voting
  • Subject can engage in diplomacy with other empires
  • Subject cannot vote independently
  • Subject joins any Diplomacy federation.png Federation the overlord joins (if the federation law allows)
  • Subject joins the GalacticCommunity mainButton single.png Galactic Community if the overlord is part of it
0 0
  • Subject (Unless either Personal Oversight or A Voice for All resolution is enacted):
    • No.pngDiplomacy istributary.png Tributary
    • No.pngCivic fanatic purifiers.pngCivic devouring swarm.pngCivic machine terminator.png Not Genocidal
Independent Diplomacy
  • Subject can engage in diplomacy with other empires
  • Subject can vote independently
+5 +0.5 No.pngResolution bureaucratic surveillance.png Personal Oversight resolution
Expansion
Expansion Prohibited Subject cannot construct outposts −15 −1
  • Overlord:
    • No.pngCivic feudal realm.png Feudal Society
    • No.pngCivic franchising.png Franchising
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy istributary.png Subsidiary
    • No.pngDiplomacy issatrapy.png Satrapy
    • No.pngBulwark Bulwark
    • No.pngProspectorium Prospectorium
    • No.pngScholarium Scholarium
Expansion Regulated Subject must pay the overlord an additional 50% of the Influence.png influence cost when constructing outposts −5 0
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Expansion Permitted Subject can construct outposts +5 +0.5
  • Overlord (unless A Voice for All resolution is enacted):
    • No.pngOrigins imperial fiefdom.png Imperial Fiefdom overlord
Overlord Conflicts
None The subject joins none of the overlord's wars 0 0
  • Subject:
    • No.pngDiplomacy istributary.png Subsidiary
    • No.pngBulwark Bulwark
Defensive The subject joins only the overlord's defensive wars
  • −10 if not Pacifist.pngFanatic Pacifist.png Pacifist
  • −20 if Pacifist.pngFanatic Pacifist.png Pacifist
−1
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy issatrapy.png Satrapy
Offensive The subject joins only the overlord's offensive wars
  • −20 if not Pacifist.pngFanatic Pacifist.png Pacifist
  • −40 if Pacifist.pngFanatic Pacifist.png Pacifist
−2
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
All The subject joins all of the overlord's wars
  • −30 if not Pacifist.pngFanatic Pacifist.png Pacifist
  • −60 if Pacifist.pngFanatic Pacifist.png Pacifist
−3
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy issatrapy.png Satrapy
Subject Conflicts
None The overlord joins none of the subject's wars −10 0
  • Overlord:
    • No.pngCivic feudal realm.png Feudal Society
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy istributary.png Subsidiary
    • No.pngDiplomacy isprotectorate.png Protectorate
    • No.pngScholarium Scholarium
Defensive The overlord joins only the subject's defensive wars +5 +0.5
  • Subject:
    • No.pngDiplomacy issatrapy.png Satrapy
Offensive The overlord joins only the subject's offensive wars +10 +1
  • Overlord:
    • No.pngOrigins imperial fiefdom.png Imperial Fiefdom overlord
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy isprotectorate.png Protectorate
    • No.pngScholarium Scholarium
All The overlord joins all of the subject's wars

+15

+1.5
  • Overlord:
    • No.pngOrigins imperial fiefdom.png Imperial Fiefdom overlord
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy issatrapy.png Satrapy
Holdings Limit
0 The overlord cannot construct any holdings across the subject's worlds 0 0
1 The overlord can construct 1 holding across the subject's worlds −5 −0.4
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
2 The overlord can construct 2 holdings across the subject's worlds −15 −1
  • Overlord Overlord DLC
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
3 The overlord can construct 3 holdings across the subject's worlds −30 −2
  • Overlord Overlord DLC
  • No.pngResolution bureaucratic surveillance.png Personal Oversight resolution
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
4 The overlord can construct 4 holdings across the subject's worlds −50 −4
  • Overlord Overlord DLC
  • No.pngResolution bureaucratic surveillance.png Borderless Authority resolution
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Sensors
Independent Sensors Subject does not receive sensor data from the overlord 0 0
  • No.pngResolution bureaucratic surveillance.png Borderless Authority resolution
  • Overlord:
    • No.pngCivic franchising.png Franchising
Unified Sensors Subject receives sensor data from the overlord +5 +0.5
  • Subject (unless Borderless Authority resolution is enacted):
    • No.pngDiplomacy istributary.png Tributary

Contribution[edit | edit source]

Contribution terms of agreement dictate whether the subject or the overlord will pay something to the other empire. They are adjustable in 15% increments as a proportion of the subject's income. A negative value means that the overlord pays the subject (a subsidy) and a positive value means that the subject pays the overlord (a tax). Any contribution other than 0% blocks regular diplomatic trading of those resources.

Type Resources Trade cat loyalty.png Immediate Trade cat loyalty.png Monthly Minimum and maximum amounts
Diplomacy isvassal.png Vassal Diplomacy istributary.png Tributary / Subsidiary Diplomacy issatrapy.png Satrapy Bulwark Bulwark Scholarium Scholarium Prospectorium Prospectorium Diplomacy isprotectorate.png Protectorate
Basic Energy.pngMinerals.pngFood.png 0 to −45 +3.7 to −3.7 −45% to +45% +30% to +75% +30% to +75% −75% to −30% −45% to +45% +30% to +75% −75% to +45%
Advanced Alloys.pngConsumer goods.png 0 to −45 +3.7 to −3.7 −45% to +45% −00% to +75% −00% to +45% −75% to +00% −45% to +45% +15% to +75% −75% to +00%
Research Engineering researchPhysics ResearchSociety research 0 to −90 +3.7 to −3.7 −45% to +45% −00% to +75% −00% to +00% −45% to +45% +30% to +75% −75% to −30% −75% to +00%
Strategic Exotic gases.pngRare crystals.pngVolatile motes.png 0 to −135 +3.7 to −3.7 −45% to +45% −00% to +75% −00% to +30% −45% to +45% −45% to +45% −00% to +75% −75% to +00%

A Bulwark Bulwark or Prospectorium Prospectorium's required subsidy (basic and research respectively) increases by 15% for each tier the subject reaches: 45% at tier 2, 60% at tier 3. Additionally, a tier 2 or 3 Prospectorium must pay at least a 30% tax of their strategic resources.

Subject types[edit | edit source]

There are five types of regular subjects, three types of specialized subjects and five types of fallen empire subjects.

Negotiable subjects[edit | edit source]

Type Subject Requirements Special Terms Description
Diplomacy isvassal.png Vassal
  • No.pngAuth corporate.png Corporate overlord
  • No.pngCivic inwards perfection.png Inward Perfection
  • Relative power icon.png Within 60% technological difference
A vassal is a subject of another empire, often with little to no self-rule. Having signed a pact with a foreign power, they are often at the whims and mercy of their overlord, forced to bend to whatever rules and regulations their liege wishes. For some weakened empires, this is the final stopgap before they are consolidated properly into the fold, as they are signing away their autonomy bit by bit.
Diplomacy isprotectorate.png Protectorate
  • Relative power icon.png More than 50% technological difference
  • Overlord Not converting to specialist subject
  • No.pngOrigins imperial fiefdom.png Imperial Fiefdom overlord
  • Overlord gains Monthly influence +0.25 monthly influence
  • Subject:
    • Gains Mod country all tech research speed.png −80% research cost
    • No.png Cannot form Diplomacy research agreement.png research agreements
A protectorate is a subject that is considerably weaker than their overlord, reduced to the point where their vassalage is considered a boon to them. Protected from the dangers of the greater galaxy, they can stabilize and improve their homeland as their liege looks out for them.
Diplomacy istributary.png Tributary
  • No.pngAuth corporate.png Corporate overlord
  • Relative power icon.png Within 60% technological difference
A tributary is a fairly autonomous subject, still in charge of their own affairs both internally and politically. They pay a considerable amount of tribute for their overlord's protection, and as long as the money is flowing, they are mostly free to do whatever they want.
Diplomacy istributary.png Subsidiary
  • Auth corporate.png Corporate overlord
  • Relative power icon.png Within 60% technological difference
A subsidiary is a subject with a considerable amount of self-rule, free to attend to their own affairs. They have signed away some of their independence for a deal where both sides are expected to support and aid one another.
Diplomacy issatrapy.png Satrapy Khan's Throne Khan's Throne relic overlord Subject contributes 30% of their Mod navy size add.png naval capacity to the overlord A Satrapy is a Subject type continuing the traditions of the Great Khan that is obligated to provide their Overlord with both ships and resources.

Specialized subjects[edit | edit source]

Specialized subjects cannot be integrated and have additional effects. They can gain experience to increase in tier and gain additional effects. To reach tier 2, they need 1200 experience, and to reach tier 3, they need 3600 experience. Experience is gained monthly at a value of a tenth of the subject's Trade cat loyalty.png loyalty. Empires with the Origins imperial fiefdom.png Imperial Fiefdom origin will become a specialized subject of their choice shortly after the game starts. Protectorates cannot be made into a specialized subject; any other regular type of subject can be turned into a specialized subject through the agreement screen.

Overlord effects do not stack if there are multiple specialized subjects of the same type. The Relay Network effects require a Hyper Relay connection between the overlord and subject's capital systems and only apply to overlord systems connected to the same Hyper Relay network.

Type Effects for subject Tier 1 Tier 2 Tier 3
Specialist subject bulwark.png Bulwark

Overlord gains:

  • Mod starbase upgrade cost.png Starbase upgrade cost: −20%
  • Mod starbase upgrade time mult.png Starbase upgrade speed: +20%
  • Mod planet crime mult.png Crime from Relay Network: −10%
  • Mod planet stability add.png Stability from Relay Network: +5
  • Building Can construct Vigil Command holdings
Defense platform damage Starbase damage +50% +50% +75%
Defense platform hull points Starbase hull points +50% +50% +75%
Defense platform damage Defense Platform damage +50% +75% +100%
Defense platform hull points Defense Platform hull points +50% +75% +100%
Defense platform build cost Defense Platform build cost −25% −50% −75%
Upkeep Defense Platform upkeep −25% −50% −75%
Defense platform cap Defense Platform cap +2 +5 +8
Shield Shield hitpoints starbase aura +100% +100% +100%
Mod ship hull regen.png Hostile daily hull regen starbase aura −0.3%
(−0.5% with Tradition icon unyielding.png Unyielding completed)
Energy.png Monthly energy −20% −35% −50%
Minerals.png Monthly minerals −20% −35% −50%
Food.png Monthly food −20% −35% −50%
Mod leader species exp gain.png Admiral Starting level +1 +1
Leader skill levels.png Admiral level cap +2 +2
Admiral.png Admirals gain Bulwark traits Yes.png Yes.png
Trade cat transfer leader.png Admirals can be traded to the Overlord Yes.png Yes.png
Technologies Unlocked Tech aura snare.png FTL Inhibition
Technologies added as research options
  • Starhold Starhold
  • Tech planetary shield generator.png Planetary Shields
  • Star Fortress Star Fortress
  • Tech modular engineering.png Modular Engineering
Tech starbase 5.png Citadel
Ship class Can build Battlewright construction ships Yes.png
Specialist subject prospectorium.png Prospectorium
Overlord gains:
  • Cost Mining station build cost: −20%
  • Speed Mining station build speed: +20%
  • Mod planet building build speed mult.png Planetary build speed from Relay Network: +25%
  • Mod planet building cost mult.png Building cost from Relay Network: −25%
  • Building Can construct Offworld Foundry holdings
Cost Mining station build cost −10% −25% −50%
Energy.png Monthly energy +10% +20% +30%
Minerals.png Monthly minerals +10% +20% +30%
Alloys.png Monthly alloys +10% +20% +30%
Volatile motes.pngExotic gases.pngRare crystals.png Monthly strategic resources +10% +20% +30%
Research.png Monthly research −30% −40% −50%
20% Yearly chance to discover a resource cache Only Energy.png energy or Minerals.png minerals Also Alloys.png alloys or Volatile motes.pngExotic gases.pngRare crystals.png strategic resources Also Zro.pngDark Matter.pngLiving Metal.png rare resources
Mod leader species exp gain.png Governor starting level +1 +1
Leader skill levels.png Governor level cap +2 +2
Governor.png Governors gain Prospectorium traits Yes.png Yes.png
Trade cat transfer leader.png Governors can be traded to the Overlord Yes.png Yes.png
Technologies added as research options
  • Tech exotic gases.png Exotic Gas Extraction
  • Tech volatile motes.png Mote Stabilization
  • Tech mine rare crystals.png Rare Crystal Mining
  • Tech mine dark matter.png Dark Matter Drawing
  • Living Metal Living Metal
  • Tech mine zro.png Zro Distillation
Decision strip mining.png Enables the Strip Mining decision Yes.png
Specialist subject scholarium.png Scholarium
Overlord gains:
  • Research.png Monthly research: +10%
  • Job researcher.png Researcher output from Relay Network: +10%
  • Building Can construct Ministry of Science holdings
Research.png Monthly research +20% +30% +40%
Mod num tech alternatives add.png Research alternatives +1 +1 +1
Mod navy size add.png Naval capacity −30% −40% −50%
Mod starbase shipyard build cost mult.png Military ship build cost +30% +40% +50%
Mod ship upkeep mult.png Military ship upkeep +30% +40% +50%
20% Yearly chance to discover a research cache Research.png +1000 points of single type Research.png +2000 points of single type
  • 1 in 4 chance: random research option instead of Research.png
  • With Discovery Discovery completed:
  • Research.png +3000 points of single type
Mod leader species exp gain.png Scientist starting level +1 +1
Leader skill levels.png Scientist level cap +2 +2
Scientist.png Scientists gain Scholarium traits Yes.png Yes.png
Trade cat transfer leader.png Scientists can be traded to the Overlord Yes.png Yes.png
Ship class Can build Arctrellis science ships Yes.png

Fallen empire subjects[edit | edit source]

Fallen empire subjects have preset terms of agreement. They do not allow subject integration or holdings.

Type Proposing empire Diplomatic Freedom Expansion Overlord Conflicts Subject Conflicts Resource Contribution
Diplomacy hasvassal.png Dominion Fanatic Spiritualist.png Doctrinal Enforcers awakened empire Yes.png Independent Diplomacy Yes.png Expansion Permitted No.png None No.png None Energy.pngMinerals.pngFood.png Basic 30%
Diplomacy hasvassal.png Satellite Fanatic Materialist.png Watchful Regulators awakened empire Yes.png Independent Diplomacy Yes.png Expansion Permitted No.png None No.png None Research.png Research 30%
Diplomacy hasvassal.png Signatory Fanatic Xenophile.png Benevolent Interventionists awakened empire No.png Limited Diplomacy Yes.png Expansion Permitted No.png None Yes.png Defensive None
Diplomacy hasvassal.png Thrall Fanatic Xenophobe.png Jingoistic Reclaimers awakened empire Yes.png Independent Diplomacy No.png Expansion Prohibited No.png None No.png None Energy.pngMinerals.pngFood.png Basic 30%
Diplomacy hasvassal.png Scion Origins scion 1.png Scion origin Yes.png Independent Diplomacy Yes.png Expansion Permitted Yes.png All No.png None None

Integration[edit | edit source]

Subjects that have Integration Permitted in the terms of agreement can be integrated into the overlord empire after 10 years via a diplomatic action, transferring ownership of the subject's systems, ships, and relics to the overlord; the subject's leaders, stockpiled resources, and armies are not transferred. Only one subject can be integrated at a time. Integration costs Influence.png 5 influence per month and has a base cost with the following formula:

If the player empire is integrated, the game is automatically lost.

Holdings[edit | edit source]

Main article: Holdings

Overlord holdings are special buildings which can be constructed on subjects' worlds. The max number of holdings across all of a subject's worlds depends on the Holdings Limit agreement term as well as the Resolution bureaucratic surveillance.png Bureaucratic Surveillance resolutions.

References[edit | edit source]

Game concepts
Governance EmpireEthicsGovernmentCivicsPoliciesEdictsLeaderFactionsPopulationSpecies rightsEconomyTechnologyTraditionsCrime
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Diplomacy DiplomacyTradeSubject empireFederationsGalactic communityAI personalitiesIntelligence
Warfare WarfareSpace warfareLand warfareShipShip designer
Others TraitsPop modificationSlaveryCrisisPreset empiresAI playersEaster eggs