Subject empire

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This article is considered accurate for the current version (1.4) of the game.
You have turned out more interesting than we could ever imagine. We never expected to assume the perspective of a subject. - Enigmatic Observers as subjects

A subject empire is an Empire that has a diplomatic relationship with an other Empire of superior strength, their Overlord.[1]

Subject types[edit]

  • Diplomacy istributary.png Tributary is a mix of various effects and possibly highly bugged as of 1.4. The Subject pays 25% of it's Mineral and Energy income to the overlord, but in turn the overlord is not supposed to be able to attack. However in practice the overlord can attack (however the Tributary still gains warscore as if in a war of independence).

Neither the overlord nor the Tributary have any obligation to help one another when attacked or attacking. If this state is acquired via warfare, a cost free Guarantee of Independence is signed with the Tributary. However this Guarantee can be revoked at any time with the usual penalties. Due to the Guarantee and Subject Relationship, Trust grows quickly up to 100. This state can be converted into a Protectorate or Vassalage per the usual rules, with the Trust acting as a big positive modifier.

  • Diplomacy isprotectorate.png Protectorate is a subject protected by a relatively technologically superior Empire. The Protectorate gains a huge research-bonus (80%) to all technologies that their Overlord has already researched, and is automatically converted to a Vassal once they researched 40% of the overlord's current tech. Any pre-FTL species that is technologically enlightened is automatically created as a Protectorate under whichever Empire granted them the ability to space-travel. The Overlord in turn gains political +0.5 Influence.png each month. The overlord will defend the protectorate when attacked, but the Protectorate is not drawn into wars unless it turns into a Vassal.
  • Diplomacy isvassal.png Vassal is the most controlled type of subject-Empire. They will automatically join their Overlord's wars, aggressive and defensive, and they have no autonomy when it comes to foreign policy or diplomatic relations, nor can they colonize new worlds. A vassal also runs the risk of a full diplomatic integration by their Overlord. If there is significant technological differences between both empires, this option is replaced by the Protectorate state. Planets owned by vassals count towards their overlord's Victory Conditions.

Fallen Empire Subjects[edit]

Should a Fallen Empire awaken they will offer every empire the option to become their subject, sparing an empire their potential wrath.

  • A Thrall is a subject of the Jingoistic Reclaimers. They can not colonize new worlds and pay 25% of their Mineral and Energy income to the Fallen Empire. However they can declare war and conquer worlds from each other.
  • A Dominion is a subject of the Doctrinal Enforcers. They must pay 25% of their Mineral and Energy income to the Fallen Empire and their ethos are changed to Fanatic Spiritualist.png Fanatic Spiritualist and Collectivist.png Collectivist while their government type is changed to Divine Mandate.png Divine Mandate.
  • A Satellite is a subject of the Watchful Regulators. They must pay 25% of their research production to the Fallen Empire and are banned from using artificial intelligence.
  • A Signatory is a subject of the Benevolent Interventionists. They have no autonomy over their diplomatic policy and are forbidden from purging or conducting slavery but can expand and the Benevolent Interventionists will come to their protection should they be attacked.

Subject actions[edit]

Why must our great mind do the bidding of a such a failed society? - disloyal Hive Minds

For subject empires the attitude is replaced by loyalty, expressing how content they are living under their Overlord’s rule. If a subject's loyalty becomes low they have a chance to start a war for independence, often waiting for an opportunity when they sense weakness (a taxing war, a larger uprising, a galactic crisis etc.). The loyalty is a compound of a few different parameters but the main ones are the subjects opinion of the Overlord, the total military strength of all the subjects relative to the Overlord as well as if the subject can find someone who supports their cause.

An Empire is able to support the independence of another Empire's vassal. Doing this will greatly increase the vassal's Liberty Desire (assuming the supporter has a fleet rivaling that of the vassal's Overlord) and may cause them to rebel. If they do, the Empire supporting them automatically joins their war for independence. An Empire is also able to guarantee the independence of a smaller Empire, automatically entering the war on their side should they be attacked.

Subject empires do not suffer from border friction.


Vassals that an empire possess for longer than 3600 days (10 years) can be peacefully "integrated" by paying Influence.png influence, at a rate of 5 Influence.png influence a month. The base cost is 20, increased by 10 for each pop and 50 for each planet. Only one vassal can be integrated at a time.

Once the integration is completed, all planets and ships of the vassal are transferred to the overlord. The ships and the spaceports are left with their graphic culture. All the vassal leaders are exiled and all their armies are erased, as well as all the resources they have. New scientists are required for their science ships.


  1. Dev Diary #19 - Diplomacy & Trade
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