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Console:Subject empire


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This article is for the console version of Stellaris only.

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

An empire can become a subject either forcefully through wargoals or willingly, though the latter requires both a superior relative power and a positive attitude towards the superior party. If an empire becomes a subject willingly it brings a temporary +30 Diplomacy opinion.png Opinion. If it becomes a subject forcefully it brings a temporary -30 Diplomacy opinion.png Opinion

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


Subject typesEdit

There are a number of types of subjects available depending on the overlord's government. Most of them have to pay a certain tribute to the overlord.

Type Tribute Can expand Diplomacy Protected Joins overlord's wars Can be integrated Other effects Overlord requirements
  •   25% Energy Output
  •   25% Minerals Output
  • Not   Corporate authority
  • Not   Corporate authority
  • Less than 50% technological superiority
  • Neither empire has   Inward Perfection civic
  • Subject gains   −80% Research Cost towards technologies researched by the overlord
  • Overlord gains   +0.25 Monthly Influence
  • At less than 50% Technological Level difference the Protectorate becomes a Vassal
  • Not   Corporate authority
  • More than 50% technological superiority
  • Neither empire has   Inward Perfection civic
  Subsidiary   25% Energy Output          
  •   Corporate authority
  •   25% Energy Output
  •   25% Minerals Output
  • Ethics are shifted towards   Fanatic Spiritualist if not   Gestalt Consciousness
  • Doctrinal Enforcers Awakened Empire
  Satellite   33% Research Output          
  • Watchful Regulators Awakened Empire
  • Slavery and Purge policies stay set to Prohibited
  • Benevolent Interventionists Awakened Empire
  •   25% Energy Output
  •   25% Minerals Output
  • Jingoistic Reclaimers Awakened Empire
  • Can use the Bring Into Fold Wargoal
  • Can travel through the borders of all Fallen Empires
  •   Scion origin
  •   10% Energy Output
  •   20% Minerals Output
  •   30% Naval Capacity
  • House a Void Dwelling in the capital system
  • The Horde
  • Subject didn't rebel before

If an empire switches its authority to or from   Corporate, its subjects' types remain unchanged.

Subject actionsEdit

For subject empires the attitude is replaced by loyalty, expressing how content they are living under their Overlord’s rule. If a subject becomes disloyal they refuse any deal with the overlord and have a chance to start a war for independence, always waiting for an opportunity when something depletes the overlord's relative power (a taxing war, a larger uprising, a crisis, etc.). The loyalty is determined by the subject's opinion of the Overlord, which aside from the normal factors is also affected by the total military strength of all the subjects relative to the Overlord as well as that of those who support their independence.

A subject cannot declare a war of independence while in a federation. This occurs when the overlord's federation has the law "Can Subjects Join" set to "yes."

An Empire is able to support the independence of another Empire's vassal. Doing this will count the supporting empire's fleet for the "relative power of subjects" opinion modifier, causing the subject to rebel if they stand a good chance of victory. If they do, the Empire supporting them automatically joins their war for independence.

Subject empires do not suffer from border friction and can therefore in some cases be utilized as buffer states between two empires that otherwise would have significant border friction issues.

The opinion penalty from Relative Power is reduced by 50% with the   Feudal Society civic and by 33% with the   Franchising civic.

Vassals and Protectorates cannot build new starbases and expand their empires, unless their overlord has the   Feudal Society civic.


Vassals and Protectorates that an empire possess for longer than 3 600   days can be peacefully "integrated" by paying   influence, at a rate of 5   influence a month. The base cost is 50, increased by 1 for each pop and 10 for each planet. Empires with the   Shared Destiny ascension perk benefit from a -50%   influence cost to integrating subjects. Only one subject can be integrated at a time.

Once the integration is completed, all planets and ships of the subject are transferred to the overlord; the ships and starbases retain their graphic type. All leaders, resources and armies are removed; new scientists are required for their science ships.

Releasing as a vassalEdit

A player can create a vassal from their own territory by releasing one of their sectors as a vassal from the "Sectors" tab by clicking the "Create Vassal" button next to the sector they want to release. The player can then transfer additional systems to their vassal through the Trade option "Transfer System" if they so choose. Sometimes it is preferable to conquer systems and then release them as a vassal since this will create a vassal that shares the overlord's ethics and government. Notably, the vassal will be granted all its overlord's technology. The option to release a vassal is not available to   Determined Exterminator or for species with Culture Shock or the   Hive-Minded and   Nerve Stapled traits.

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