Anomaly

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Version

Outliner top.png
This article is considered accurate for the current version (2.2) of the game.

This article is for the PC version of Stellaris only.
Anomalies tab

An anomaly is represented by survey readings that deviate from what is normal. When a science ship surveys a celestial body it may identify an anomaly that needs further investigation. Anomalies have their own tab in the Situation Log.

When the investigation of an anomaly is complete, an event will pop up that can give various bonuses, such as research points, resources on a planet, or even a special project which requires further research investment to unlock benefits. Certain Ethics occasionally have additional options.

Each surveyed celestial body has a 5% chance of spawning an anomaly, which is increased by 0.5% for every surveyed planet with no anomaly before being reset. The Leader trait meticulous.png Meticulous trait also increases the chance of finding anomalies by 10%.

To investigate an anomaly, a science ship with a scientist on board must be present at the celestial body where the anomaly is located. Investigating them takes time, which is determined by the level of the scientist minus the difficulty level of the anomaly. As such, anomalies of higher levels are often best left off until a skilled scientist can study them faster.

Level difference Investigation days
+9 (Inconsequential) 20
+8 (Inconsequential) 24
+7 (Trivial) 30
+6 (Trivial) 35
+5 (Very Easy) 45
+4 (Very Easy) 55
+3 (Easy) 65
+2 (Easy) 80
+1 (Routine) 100
0 (Routine) 120
Level difference Investigation days
-1 (Routine) 180
-2 (Challenging) 300
-3 (Challenging) 540
-4 (Hard) 720
-5 (Hard) 1080
-6 (Very Hard) 1440
-7 (Very Hard) 2160
-8 (Hellish) 2880
-9 (Hellish) 5760

Precursors[edit]

First League anomaly

The Precursors are long dead galactic empires predating even the fallen empires and the curators. Their ruins are scattered across the galaxy for the player to find via anomalies. Precursor anomalies grant a special project which once investigated grants a moderate amounts of Engineering Research Engineering, Physics Research Physics or Society Research Society research as well as a precursor artifact. 6 artifacts are required to reveal the location of a precursor's home system.

If every precursor anomaly has been investigated but no empire managed to collect 6 artifacts a random event can trigger every 20 years and add another precursor anomaly on one of the previously investigated planets. The time is lowered to 13.3 years for Gestalt consciousness.png Gestalt Consciousness empires.

AI empires can also sell a discovered artifact to human empires for 1000 Energy Credits.png Energy. If the human empire has the Civic warrior culture.png Warrior Culture civic it can threaten the AI empire to surrender it for free, the success rate depending entirely on both empires' Relative Power. Empires that hold a Protective, Friendly or Loyal attitude will offer the artifact for free instead of asking for payment. Each AI empire will only offer an artifact once.

There have been 5 precursor civilizations:

Precursor civilization Galactic area Homeworld Homeworld survey reward Home system deposits Notes
Vultaum Star Assembly North-East Planet barren.png Vultaumar Prime
  • Unity.png 240 - 9999 Unity
  • Engineering Research 250 - 1500 Engineering research
  • Physics Research 250 - 1500 Physics research
  • Society Research 250 - 1500 Society research
  • Research.png 10 of all research resources
  • Minerals.png 10 Minerals
  • Energy Credits.png 10 Energy
  • Alloys.png 5 Alloys
  • Exotic gases.png 5 Exotic Gases
Yuht Empire East on larger maps
South-East on smaller maps
Planet barren.png Yuthaan Majoris
  • Unity.png 240 - 9999 Unity
  • Energy Credits.png 350 - 2000 Energy
  • Minerals.png 350 - 2000 Minerals
  • Research.png 10 of all research resources
  • Minerals.png 10 Minerals
  • Energy Credits.png 10 Energy
  • Alloys.png 5 Alloys
  • Exotic gases.png 5 Exotic Gases
First League South on larger maps
South and North on smaller maps
Planet city.png Fen Habbanis III
  • Unity.png 240 - 9999 Unity
  • Society Research 350 - 2000 Society research
  • Influence.png 150 - 300 Influence
  • Research.png 10 of all research resources
  • Minerals.png 10 Minerals
  • Energy Credits.png 10 Energy
  • The First League offers the only habitable homeworld, a size 25 Ecumenopolis
  • The system is the best of the precursor rewards until late game
Irassian Concordat North-West Planet barren.png Irassia
  • Unity.png 240 - 9999 Unity
  • Physics Research 350 - 2000 Physics research
  • Minerals.png 350 - 2000 Minerals
  • Research.png 10 of all research resources
  • Minerals.png 10 Minerals
  • Energy Credits.png 10 Energy
  • Alloys.png 5 Alloys
  • Exotic gases.png 5 Exotic Gases
Cybrex South on larger maps
South-West on smaller maps
Planet ringworld.png Ruined Ring World
  • Unity.png 240 - 9999 Unity
  • Engineering Research 350 - 2000 Engineering research
  • Energy Credits.png 350 - 2000 Energy
None
  • The ruined ringworld can be repaired
  • The system is the best of the precursor rewards in late game
  • The Cybrex are not extinct and may return during the Contingency crisis

Media Coverage[edit]

A number of anomaly events can be solved in ways that will impact an empire's media views on the empire if not Gestalt consciousness.png Gestalt Consciousness. Such outcomes bring a Mod pop happiness.png Happiness modifier for 10 years.

Media Coverage modifier Happiness
Extremely Positive +40%
Very Positive +25%
Positive +10%
Negative -10%
Very Negative -20%
Extremely Negative -30%
Game concepts