This article is for the PC version of Stellaris only.
Diplomacy in Stellaris draws on the model of previous Paradox games and offers an alternative to warmongering.
Envoys are minor leaders and can be assigned to various diplomatic tasks. Once an envoy is assigned to a task, it cannot be reassigned again for a year. Envoys can be assigned to the following tasks:
- Improve Relations with another empire, which grants +0.25 opinion per month to and from the target empire (up to +100) and removes the relation requirement for positive diplomatic actions
- Harm Relations with another empire, which grants −0.5 opinion per month to and from the target empire (up to −100) and removes the relation requirement for negative diplomatic actions
- Assign to the Federation, which grants +1 cohesion per month to the federation
- Assign to the Galactic Community, which grants +10% diplomatic weight
- Assign to the Galactic Imperium, to either strengthen or weaken Imperial Authority
- Assign to a first contact, and they will discover the aliens for you
- Assign to build a Spy Network, which will increase infiltration in another empire over time.
Envoy Capacity can be modified by the following:
Please help with verifying or updating this section. It was last verified for version 3.4.
Many diplomatic actions have a 10-year cooldown once chosen. Some of these are unilateral while others need to be accepted by both sides which becomes a matter of acceptance. Most diplomatic actions require certain a Relations level or an envoy being sent to improve or harm relations.
Maintaining any form of lasting treaty generates Trust, which increases opinion. The maximum amount of Trust obtainable is limited by the most valuable treaty between both parties. Acquiring the Direct Diplomacy perk from the Diplomacy tradition tree grants +50 trust cap. Trust decays if there is no new income.
|Improve Relations||Sends an Envoy to increase Opinion up to +100||0||0||50||0||Any||Not Harming Relations||N/A|
|Harm Relations||Sends an Envoy to lower Opinion up to −100||0||0||50||0||Any||Not Improving Relations||N/A|
|Build Spy Network||Sends an Envoy to build a Spy Network||0||0||50||0||Any||No Spy Network||N/A|
|Make Claims||Switches to the Claims interface.||0||0||0||0||Any||Can claim any system||N/A|
|Declare War||Enters the Wargoals menu to declare a war||−50||0||50||0||Any||N/A|
|Close/Open Borders||Controls border access. The initial stance is determined by the Initial Border Status policy.||−20||0||50||0||Any||N/A|
|Invite to Federation||Invites the target empire to join a Federation. Other Federation members must agree.||+50||+1||100||−2||Excellent||N/A|
|Ask to join Federation||Requests to join an already existing Federation. Other Federation members must agree.||+50||+1||100||−2||Excellent||Existing Federation and requestor both at peace||N/A|
|Kick from Federation||Starts a vote to kick the member from the Federation||0||0||50||0||Any||
|Ask to leave Federation||Requests to leave the Federation. Refusing grants the Secession Casus Belli and a decaying −45 Opinion.||0||0||50||0||Any||N/A|
|Association Status||The empire and the Federation will not be able to declare war upon each other.||+10||+0.50||100||0||
||The majority of federation members must agree to granting or removing the status but the associate member can cancel it at any time||N/A|
|Propose Subjugation||Enters the Terms menu to propose becoming overlord||+25||+0.25||50||0||Any||Both empires are at peace||N/A|
|Ask to be their Subject||Enters the Terms menu to propose becoming subject||+25||+0.25||50||0||Any||Both empires are at peace||1|
|Release Subject||Grants independence to the subject and sets a 10-year Truce||0||0||50||0||Any||N/A|
|Integrate Subject||Integrates a Vassal or Protectorate into the overlord empire.||0||0||50||Variable||Any||1|
|Insult||Decaying −200 Opinion Modifier||0||0||50||0||
|Add to/Kick from Imperial Council||Decides who is member of the Imperial Council.||0||0||50||0||Any||1-5|
Unilateral agreements are diplomatic actions that can only be proposed and ended by one of the empires. Rivalries can only end 10 years after they were proposed.
Bilateral agreements are mutually-beneficial diplomatic actions that when offered by an empire the other must accept for them to take effect. Agreements can be ended at any time by either empire but will bring a temporary Opinion malus. Defensive Pacts and Federations can only be made or broken when neither empire is at war with anyone. Federations also require the The Federation tradition.
The acceptance of diplomatic agreements by computer empires is determined by multiple factors.
The most specific factor that determines an empire's acceptance rate is its AI personality.
Trade deals are instant or monthly transfers of resources or other assets between two empires. Deals that transfer monthly resources last between 10 and 30 years; once the AI fills their stockpile, long-term contracts become only viable option. It is possible to break long-term trade contracts if not enough resources are stockpiled, but this causes an opinion penalty. Diplomatic trades often can yield better deals than the market. The AI will never accept mixed long-term/instant trades. Although Gestalt Consciousness empires have no use for consumer goods or Zro, they are still willing to trade for them.
Trading requires a neutral or positive attitude between the two empires. Empires holding a negative attitude will accept only gifts. Fallen empires only trade if they are patronizing or enigmatic towards the proposing empire and will never trade strategic resources. Resources cannot be traded between overlords and subjects if the terms of agreement include contribution.
Trade willingness shows how much an empire is open to trading with other empires and is dependent on their AI personality. The lower their trade willingness is, the more favorable a trade deal has to be for them to see it as fair. Empires with less than 75% trade willingness will never make offers.
In addition to resources, the following things can be traded diplomatically:
- Favors: Each favor has a trade acceptance of 10, raised or lowered by the AI empire's trade willingness.
- Communications: Valued based on the number of new contacts. Does not include Enclaves. Fallen Empires always refuse.
- Active Sensor Link: Valued based on distance, neighboring empires being more interested. Allows the empire receiving the link to see everything the granting empire can see. Only available as a timed deal. Fallen Empire always refuse.
- Transfer System: Available only towards neighbors during peacetime, it is the most valued trade option and can be used to offer to cede one of your star systems, usually non-preferred planets that are too expensive to terraform or adapt pops to, or as a way to ease opinion penalty of claims or border tension. The AI will always refuse to accept systems that contain colonized Holy Worlds or border the Militant Isolationists.
Subject trade deals
Subject empires have additional trading options with their overlord:
- Borrow Fleet: Gives the subject temporary control a fleet. Valued based on how much of the total fleet power the fleets represent.
- Pledge Loyalty: Only available from a subject towards the overlord as a timed trade deal; if the subject has 150 opinion or better towards the overlord, it gives +2.5 loyalty monthly, otherwise +1.5 monthly.
- Share Empire Data: Adds +20 intel from the giver to the recipient; can be given by the overlord if they have 80 or less intel on the subject; can be given by the subject if they have 40 or less intel on the overlord.
- Loyalty: Only available from a subject towards its overlord, each point of loyalty will increase trade acceptance by 1. Loyalty can be used even if the value would become negative, up to −100.
- Transfer Leader: Requires a tier 2 specialized subject, transfers a subject leader to the overlord. Valued based on the leader's abilities.
Specialist subjects have additional, unique trade options which extend their bonuses to the overlord, usually at the cost of their own:
The trade acceptance number shows how much the other empire favors a deal. A trade acceptance lower than 1 means that the other empire sees the deal as disadvantageous for them and will always refuse it. A trade acceptance of 1 means that AI empire sees the deal as fair and will always accept it. A trade acceptance higher than 1 means that the other empire sees the deal as advantageous for them and will give a temporary bonus to their opinion, although this has a limit of +100.
Favors can be traded via diplomatic trade or obtained through events and have two purposes. First, an empire can call upon Favors to add another empire's Diplomatic Weight to theirs (10%per favor) when voting Resolutions in the Galactic Community as long as they don't already vote identically. This does not decrease the other empire's diplomatic weight for the vote. Second, Favors increase the acceptance rate of certain diplomatic agreements or federation laws by +5 for each Favor. An empire can owe another empire up to 10 Favors.
Multiple empires can call upon Favors from the same target empire.
Each empire will have a specific attitude towards other empires dictated by their AI personality, diplomatic interactions and the relative power of both empires.
|Attitude||Trade & Pacts||Prefer peace||Other Effects||Requirements||Description|
|Neutral||none||This Empire does not consider us relevant to their interests.|
|Wary||none||inferior relative power and shared border||This Empire maintains a cautious attitude towards us.|
|Receptive||more inclined to accept diplomatic pacts||diplomatic AI personalities||This Empire is interested in closer relations with us.|
|Cordial||more inclined to accept diplomatic pacts||high opinion||This Empire is amenable to peaceful coexistence and trading with us.|
|Friendly||more inclined to accept diplomatic pacts and join a federation||high opinion and successful past diplomacy||This Empire views us as a friend and may be willing to form an alliance with us.|
|Protective||more inclined to accept diplomatic pacts and may propose subjugation||high opinion and superior relative power||This Empire believes that we are weak and need their protection.|
|Suspicious||none||low opinion||This Empire views us with suspicion and mistrust.|
|Rival||none||rival with low opinion||This Empire views us as their rival.|
|Hostile||none||very low opinion||This Empire views us as their enemy. They are likely to attack us if they think they can win.|
|Domineering||only uses the Subjugation Casus Belli||low opinion and Subjugator AI||This Empire believes that we would make a fine vassal.|
|Threatened||none||high threat rating||This Empire views us as a threatening menace.|
|Overlord||none||overlord||This Empire is our overlord.|
|Loyal||none||subject with positive opinion||This subject is loyal to us.|
|Disloyal||considers the relative power of other subjects as well||subject with negative opinion||This subject resents its subservience to us.|
|Dismissive||none||Fallen Empire||This Fallen Empire considers us largely beneath their notice.|
|Patronizing||may bestow gifts||Fallen Empire with high opinion||This Fallen Empire views us as errant children in need of their guidance. They may deign to bestow gifts of technology, resources or ships on us.|
|Angry||will send a demand which will grant them Casus Belli if refused||Fallen Empire with low opinion||We have angered this Fallen Empire with our actions, and they may declare war to punish us.|
|Arrogant||no effect||distant Awakened Empire||This Awakened Empire views us with dismissive arrogance.|
|Imperious||will propose subjugation||neighbor Awakened Empire||This Awakened Empire views us as a future subject. They are likely to demand we surrender our independence.|
|Belligerent||none||Awakened Empire with low opinion||This Awakened Empire views us as a target of conquest. They are likely to attack us.|
|Custodial||accepts joining a Federation||Guardian Awakened Empires||This Awakened Empire believes that it needs to protect us from the crisis currently threatening the galaxy. They are likely to attempt to ally us.|
|Enigmatic||opinion is hidden and has no impact||Ancient Caretakers||This Fallen Empire is an ancient artificial intelligence that behaves in a strange and unpredictable manner. We do not know what to expect from it.|
|Berserk||attacks any empire nearby||Malfunctioning Custodians||This Awakened Empire is an ancient artificial intelligence that has gone berserk. It is likely to attack anything and anyone around it.|
Empires with the Fanatic Purifiers civic can only engage in diplomacy with empires of the same primary species. Note that this other empire will still have −1000 Opinion towards Fanatic Purifier, unless it is also a Fanatic Purifier (in which case they have +200 Opinion towards each other).