Subject empire

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This article has been verified for the current PC version (3.4) of the game.
Vassalization request towards a Machine Intelligence empire

A subject is an empire that has a special diplomatic relationship with another empire of superior strength, 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 scaling negatively with the number of pops the future subject has. Having superior or overwhelming relative power in all three categories enables the Subjugation Diplomacy status casus belli holder.png Casus Belli to forcefully make an empire a subject.

Operation difficulty is reduced between subjects and their overlord.

If they have fleets available, subject fleets tend to follow the overlord's.

Loyalty[edit | edit source]

Subjects have a secondary opinion type towards their overlord called Trade cat loyalty.png Loyalty that scales from -100 to 100. It determines the subject's attitude towards the overlord and can be spent to increase the acceptance of trade deals. Loyalty is gained or lost monthly based on subject's Diplomacy opinion.png opinion and terms of agreements, although ethic compatibility, relative power and overlord holdings have a lesser impact as well. A Pledge of Loyalty can also be negotiated via trade, adding Trade cat loyalty.png +1.5 loyalty for the duration of the trade deal; if the subject's opinion of the overlord is at least 150, the Pledge of Loyalty adds Trade cat loyalty.png +2.5 loyalty instead.

If an overlord has multiple subjects, each subject gains Trade cat loyalty.png −1 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.

Subject empires can only have two attitudes towards their overlord: Loyal if loyalty is positive and Disloyal if loyalty is negative. Loyal attitude grants a bonus acceptance to most diplomatic agreements, while Disloyal attitude prevents the acceptance on any diplomatic agreement.

Trade cat loyalty.png Loyalty will also grant experience to specialized subjects. In addition, certain resolutions can raise or lower Trade cat loyalty.png 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 will remove incompatible terms from all agreements.

Category Terms Effects Trade cat loyalty.png Immediate Loyalty Trade cat loyalty.png Monthly Loyalty Influence.png Cost Requirements
Subject Integration Integration Permitted Overlord can use the Integrate Subject interaction −50 −4 275
  • No.pngEnsured Sovereignty resolution enacted
  • Subject:
    • No.pngDiplomacy istributary.png Subsidiary or Tributary
    • No.pngSpecialist subject bulwark.png Bulwark
    • No.pngSpecialist subject prospectorium.png Prospectorium
    • No.pngSpecialist subject scholarium.png Scholarium
Integration Prohibited Overlord cannot use the Integrate Subject interaction +5 +0.5 0
Diplomatic Freedom Limited Diplomacy
  • Subject cannot engage in diplomacy with other empires
  • Subject cannot vote independently
−15 −1 100
  • No.pngA Voice for All resolution enacted
  • Overlord:
    • No.pngCivic feudal realm.png Feudal Society
    • No.pngCivic franchising.png Franchising
  • Subject:
    • No.pngDiplomacy istributary.png Subsidiary or Tributary
Restricted Voting
  • Subject can engage in diplomacy with other empires
  • Subject cannot vote independently
  • Subject joins any Federation the overlord joins
  • Subject joins the Galactic Community if the overlord is part of it
0 0 25
  • Unless either Personal Oversight or A Voice for All resolution enacted:
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngCivic fanatic purifiers.pngCivic devouring swarm.pngCivic machine terminator.png Genocidal
Independent Diplomacy
  • Subject can engage in diplomacy with other empires
  • Subject can vote independently
+5 +0.5 0 No.pngPersonal Oversight resolution enacted
Expansion Expansion Prohibited Subject cannot construct starbases −15 −1 100
  • Overlord:
    • No.pngCivic feudal realm.png Feudal Society
    • No.pngCivic franchising.png Franchising
  • Subject:
    • No.pngDiplomacy istributary.png Subsidiary or Tributary
    • No.pngSpecialist subject bulwark.png Bulwark
    • No.pngSpecialist subject prospectorium.png Prospectorium
    • No.pngSpecialist subject scholarium.png Scholarium
Expansion Regulated Subject must pay the overlord an additional 50% of the Influence.png Influence cost to construct starbases −5 0 50
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Expansion Permitted Subject can construct starbases +5 +0.5 0
  • Unless A Voice for All resolution enacted:
  • Overlord:
    • No.pngOrigins imperial fiefdom.png Imperial Fiefdom overlord
Overlord Conflicts None The subject does not join the overlord's wars 0 0 0
  • Subject:
    • No.pngDiplomacy istributary.png Subsidiary
    • No.pngSpecialist subject bulwark.png Bulwark
Defensive The subject joins the overlord's defensive wars
  • −10 if not Pacifist.pngFanatic Pacifist.png Pacifist
  • −20 if Pacifist.pngFanatic Pacifist.png Pacifist
−1 50
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Offensive The subject joins the overlord's offensive wars
  • −20 if not Pacifist.pngFanatic Pacifist.png Pacifist
  • −40 if Pacifist.pngFanatic Pacifist.png Pacifist
−2 100
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
All The subject joins the overlord's wars
  • −30 if not Pacifist.pngFanatic Pacifist.png Pacifist
  • −60 if Pacifist.pngFanatic Pacifist.png Pacifist
−3 150
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Subject Conflicts None The overlord does not join the subject's wars 0 0 75
  • Overlord:
    • No.pngCivic feudal realm.png Feudal Society
  • Subject:
    • No.pngDiplomacy istributary.png Subsidiary or Tributary
    • No.pngDiplomacy isprotectorate.png Protectorate
    • No.pngSpecialist subject scholarium.png Scholarium
Defensive The overlord joins the subject's defensive wars +5 +0.5 50
Offensive The overlord joins the subjects offensive wars +10 +1 25
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
    • No.pngDiplomacy isprotectorate.png Protectorate
    • No.pngSpecialist subject scholarium.png Scholarium
All The overlord joins the subject's wars

+15

+1.5 0
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Holdings Limit 0 The overlord cannot construct holdings on the subject's worlds 0 0 0
1 The overlord can construct 1 holding on the subject's worlds −5 −0.4 25
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
2 The overlord can construct 2 holdings on the subject's worlds −15 −1 75
  • Overlord.png Overlord DLC
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
3 The overlord can construct 3 holdings on the subject's worlds

−30

−2 150
  • Overlord.png Overlord DLC
  • No.pngPersonal Oversight resolution enacted
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
4 The overlord can construct 4 holdings on the subject's worlds

−50

−4 250
  • Overlord.png Overlord DLC
  • No.pngBorderless Authority resolution enacted
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Sensors Independent Sensors Subject does not receive sensor data from the overlord 0 0 25
  • No.pngBorderless Authority resolution enacted
  • Overlord:
    • No.pngCivic franchising.png Franchising
Unified Sensors Subject receives sensor data from the overlord +5 +0.5 0
  • Unless Borderless Authority resolution enacted:
  • Subject:
    • No.pngDiplomacy istributary.png Tributary
Contribution Basic Energy.pngMinerals.pngFood.png Basic Resources Each contribution is adjustable in 15% increments as a proportion of the subject's income.

Each contribution term can be up to -75% as a subsidy (to subject) or 75% as a tax (to overlord).

0 to −45 +3.7 to −3.7 0 to 225
  • Diplomacy istributary.png Subsidiary or Tributary must pay at least 30% tax
Advanced Alloys.pngConsumer goods.png Advanced Resources 0 to −45 +3.7 to −3.7 0 to 225
  • Diplomacy istributary.png Subsidiary or Tributary cannot receive subsidy
Research Research.png Research 0 to −90 +3.7 to −3.7 0 to 225
  • Diplomacy istributary.png Subsidiary or Tributary cannot receive subsidy
Strategic Volatile motes.pngExotic gases.pngRare crystals.png Strategic Resources 0 to −135

+3.7 to −3.7

0 to 225
  • Diplomacy istributary.png Subsidiary or Tributary cannot receive subsidy

Subject types[edit | edit source]

There are 9 types of regular subjects and 3 types of specialized subjects.

Negotiable subjects[edit | edit source]

Type Subject Requirements 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.png Not converting to specialist subject
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.

Non-negotiable subjects[edit | edit source]

Non-negotiable types of subjects cannot be proposed by regular empires. 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 Engineering researchPhysics ResearchSociety research 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 issatrapy.png Satrapy Apocalypse.png The Horde Yes.png Independent Diplomacy Yes.png Expansion Permitted Yes.png All 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

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 start as specialized subjects. Specialized subjects require less than 50% technological power difference between the overlord and themselves.

Overlord effects do not stack if there are multiple specialized subjects of the same type.

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%
  • Job criminal.png Crime from Relay Network: −10%
  • Army defense.png Defense armies from Relay Network: +2
  • Building Can construct Vigil Command holdings
Spaceport 1.png Starbase Defense platform damage Damage +50% +50% +75%
Defense platform hull points Hull points +50% +50% +75%
Spaceport 1.png Defense Platform Defense platform damage Damage +50% +75% +100%
Defense platform hull points Hull points +50% +75% +100%
Defense platform build cost Build cost −25% −50% −75%
Upkeep Upkeep −25% −50% −75%
Defense platform cap Cap +2 +5 +8
Owned Starbase Auras: Shield Shield hitpoints +100% +100% +100%
Mod ship hull regen.png Hostile ship daily hull regen −0.3% (−0.5% with Tradition icon unyielding.png Unyielding traditions completed)
Energy.png Monthly energy −20% −35% −50%
Minerals.png Monthly minerals −20% −35% −50%
Food.png Monthly food −20% −35% −50%
Admiral.png Admirals Mod leader species exp gain.png Starting level +1 +1
Leader skill levels.png Level cap +2 +2
Bulwark traits Yes.png Yes.png
Trade cat transfer leader.png can be traded to the Overlord Yes.png Yes.png
Technology Unlocked Tech aura snare.png FTL Inhibition
Added as research option
  • 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 strategic resources
Governor.png Governors Mod leader species exp gain.png Starting level +1 +1
Leader skill levels.png Level cap +2 +2
Prospectorium traits Yes.png Yes.png
Trade cat transfer leader.png can be traded to the Overlord Yes.png Yes.png
Technology Added as research option
  • 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%
Military ships Mod starbase shipyard build cost mult.png Build cost +30% +40% +50%
Mod ship upkeep mult.png 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: adds random research option instead of Research.png
  • With Discovery Discovery traditions completed:
  • Research.png +3000 points of single type
Scientist.png Scientists Mod leader species exp gain.png Starting level +1 +1
Leader skill levels.png Level cap +2 +2
Scholarium traits Yes.png Yes.png
Trade cat transfer leader.png can be traded to the Overlord Yes.png Yes.png
Ship class Can build Arctrellis science ships Yes.png
Type Effects for subject Tier 1 Tier 2 Tier 3

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 control of all systems and ships to the overlord. All leaders, resources, and armies are removed, and new scientists will be required for the new science ships. 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.

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