附属国

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  评价（Opinion）. If it becomes a subject forcefully it brings a temporary -30  评价（Opinion）

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

Subject types

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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	情报（Intel）	Can expand	Diplomacy	Protected	Joins overlord's wars	Can be integrated	Other effects	Overlord requirements
Tributary	25% Energy income 25% Minerals income	30							企业政府（Corporate）
Vassal		40							企业政府（Corporate） Less than 50% technological superiority Neither empire has  内圣之道（Inward Perfection）
Protectorate		40						Subject gains −80% Research Cost towards technologies researched by the overlord Overlord gains +0.25 Monthly Influence Subject cannot sign Research Agreements At less than 50% Technological Level difference the Protectorate becomes a Vassal	企业政府（Corporate） More than 50% technological superiority Neither empire has  内圣之道（Inward Perfection）
Subsidiary	25% Energy income	40							企业政府（Corporate） authority
Dominion	25% Energy income 25% Minerals income	30						Ethics are shifted towards  极端唯心主义（Fanatic Spiritualist） if not  格式塔意识（Gestalt Consciousness）	Doctrinal Enforcers awakened empire
Satellite	33% Research income	30							Watchful Regulators awakened empire
Signatory		30						Slavery and Purge policies stay set to Prohibited	Benevolent Interventionists awakened empire
Thrall	25% Energy income 25% Minerals income	30							Jingoistic Reclaimers awakened empire
Scion		40						Can use the Bring Into Fold Wargoal	先辈子弟（Scion） origin
Satrapy	10% Energy income 20% Minerals income 30% Naval income	10						House a Void Dwelling in the capital system	The Horde Subject didn't rebel before

If an empire switches its authority to or from  企业政府（Corporate）, its subjects' types remain unchanged.

Subject actions

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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.

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  封建社会（Feudal Society） civic and by 33% with the  特许经营（Franchising） civic.

Integration

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Vassals and Protectorates that an empire possess for longer than 3 600 days can be peacefully "integrated" by paying  影响力（Influence）, at a rate of 5  影响力（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%  影响力（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.

Warning! If the player's empire is integrated by another empire the game is automatically lost!

Releasing as a vassal

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  机械智能（Machine Intelligence）s (except when you have no robot pops in the sector), Genocidal empires, species with Stellar Culture Shock, or the  蜂巢思维（Hive-Minded） and  精神阉割（Nerve Stapled） traits.

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