Fallen empire

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This article is for the PC version of Stellaris only.

A Fallen Empire on the galactic map.

Fallen Empires are large and extremely powerful empires that have become old and stagnant with their societies grown inward over the ages.[1] Their empire is fully developed at the start of the game. Due to their large and powerful fleets, they should not be provoked until your fleet strength and technology is similar. At normal difficulty, their approximate fleet power is 60k if not significantly greater, depending on the size of their empire. Fallen Empires use a unique ship and station art style which is exclusive to them, which distinguishes them from ships of ordinary empires; there are three visual variants of this style but they are otherwise identical in terms of ship configurations.

Fallen Empires can only normally be controlled by the AI, though Console commands allow a human player to switch to them in the course of a game.

It is impossible to vassalize a Fallen Empire, and they are rarely interested in peace offers once a war has begun. When engaging in a conflict with them, it is essential that an empire be fully prepared to deal with the consequences and be prepared to carry through on any demands made. Whilst they cannot be vassalized, a Fallen Empire's planets can be annexed (via the Cede option) or turned into a new state (using the Liberate goal), creating a new empire that may then be taken in as a vassal - and is highly likely to agree to such an offer, due to sharing the liberator's ethos choices along with positive modifiers from automatically-established non-aggression agreements and guarantees of independence.


Despite their size and power, they remain isolated and uninterested in the other younger empires outside of their borders unless provoked. They never colonize any new systems. They are passive towards other species until relations drop below -75 [2]. Unlike other AI empires, which require a special research project before communication is established, they will instantly contact you when you unwittingly enter their space.

Every Fallen Empire ship destroyed remains destroyed; the Fallen Empire will never attempt to replace its lost ships. They may try to replace their destroyed stations and defensive outposts, using construction ships.

Diplomacy is less nuanced with them, as they think of themselves as superior to all other empires and are rarely interested in any kind of trade - even the Enigmatic Observers, who can be quite friendly to lesser empires, strive to avoid interfering in the development of the younger empires through direct intervention or trade.

Fallen Empire AI Personality


Fallen Empire ships.

Fallen Empires use late-game technology, they are even known to have ring worlds around stars. Their fleets are equipped with tachyon lances and jumpdrives. These technologies are available to the player through normal research in the late-game. However, it may be faster to reverse-engineer it from destroyed Fallen ships, if you are able to destroy them with inferior technology.

Fallen Empires are intimidating early on, but do not do any independent research; their advantage will ultimately be overtaken by players investing in repeatable research projects.

Fallen Empire warships come in only two sizes and types;

  • Avatar-class Battlecruisers are Battleship-sized warships armed with a pair of Tachyon Lances, four medium Phased Disruptors, and two medium Plasma Cannons. For utility modules, they use four small and two large Zero-Point Reactors, powering two large Hyper Shields and one medium Shield Capacitor, augmented by three medium Neutronium Armor. Avatars have Tachyon Sensors, Advanced Defensive Combat Computers, Impulse Thrusters, and Jump Drives or Psi Jump Drives.
  • Eclipse-class Escorts are Destroyer-sized warships armed with a single Tachyon Lance, two medium Phased Disruptors, and one Guardian Point-Defense. For utility modules, they use one large Zero-Point Reactor to power one medium Hyper Shield, augmented by one small Neutronium Armor. They have the same sensors, computers, thrusters, and drive systems as the larger Avatar.

Fallen Empire defense stations also come in two sizes;

  • Sigma-class Outposts are small defensive stations found in less vital systems. They are armed with a single Tachyon Lance and a Guardian Point-Defense. Three medium Zero-Point Reactors power two medium Hyper Shields, backed up by one medium Neutronium Armor.
  • Omega-class Fortresses are larger defensive installations located near key points within the Fallen Empire's territory. Each Omega-class Fortress mounts a pair of Tachyon Lances, two medium Phased Disruptors, and two Guardian Point-Defenses. Three large Zero-Point Reactors provide power two large Hyper Shields, and the station also possesses one large Neutronium Armor.

All other Fallen Empire ships typically use the best-available technology for thrusters, sensors, and FTL drive. Their troop transports also make use of regenerative hull tissue.

Warship Stats

Ship Class Mod ship hitpoints add.png Hull Strength Mod ship armor mult.png Armor Rating Mod ship shield hp mult.png Shield Strength
Avatar 2,304 53% 1,000
Eclipse 576 29% 250

Empire titles

Fallen Empires use empire names different than that of regular empires, usually refering to the fact that they once were much more powerful and extended than they currently are. These titles include :

  • Ancients
  • Ascendency
  • Continuum
  • Core Worlds
  • Forerunners
  • Guardians
  • Remnants
  • Homeworlds
  • Primacy
  • Progenitors
  • Shard
  • Successor State


Game concepts
Governance EmpireEthicsGovernmentCivicsPoliciesEdictsLeaderFactionsPopulationSpecies rightsEconomyTechnologyTraditionsCrime
Exploration ExplorationMapSpeciesAnomalyEventsFTLFallen empirePre-FTL speciesPrecursorsSpaceborne aliens
Colonization ColonizationCelestial bodyPlanetary featuresPlanetary managementDistrictsBuildingsShipStarbaseMegastructures
Diplomacy DiplomacyTradeSubject empireFederationsGalactic communityAI personalities
Warfare WarfareSpace warfareLand warfareShip designer
Others TraitsTerraformingPop modificationSlaveryCrisisPreset empiresAI playersEaster eggs