This article is for the PC version of Stellaris only.
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Fallen Empires are large and extremely powerful empires that have become old and stagnant with their societies grown inward over the ages. Some of these are created when the galaxy is generated at the start of every game (max 3 empires). They have large and powerful fleets and should generally be left alone. It is unwise to start a war with them unless your fleet is of equal power. Indicated general strength of a Fallen empire is approximately 150-160K (at normal difficulty). If a Fallen Empire is successfully conquered, it is possible to gain advanced technology from them. Only the AI can control Fallen Empires, they are not designed to be played by a human player. They cannot become player's vassal, but can be defeated and their worlds can be captured to become part of player's empire.
Despite their size and power, they remain isolated and uninterested in the other younger empires outside of their borders unless provoked. 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.
Diplomacy is less nuanced with them, as they think of themselves as superior to all other empires. However, as mentioned during the Stellaris Multiplayer Event, it can be advantageous to keep an embassy with a Fallen Empire in order to improve relations, as they will not declare war on you until relations drop below -75. . Declaring rivalry with them is therefore a guaranteed way to destruction.
There are different kinds of Fallen Empires and they react to certain events based on their personality. Even without being contacted, Spiritualist and Materialist Fallen Empires will warn you you're angering them via an event.
Fallen Empire AI Personality
Technology and Ships
Fallen Empires use very advanced technology, they are even known to have ring worlds around stars. Their ships are equipped with Tachyon lances and jumpdrives superior to anything available to the player. They use a unique ship and station art style which is exclusive to Fallen Empires that distinguishes them from ships of ordinary empires. When one of their ships is destroyed it is likely to leave behind debris which a science ship can reverse-engineer and gain some Fallen Empire technology.
Fallen Empires cannot build additional warships, but will rebuild their fleet and space stations.
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 :
- Core Worlds
- Successor State