Unique systems can only spawn once per galaxy. Each unique system has an unique event or anomaly related to it.
Unique systems have their spawn chanced determined by the galaxy size. They will never appear in hyperlane choke points and a few of them require distance from all empires to spawn and they might not appear if the galaxy is started with a max number of fallen empires and AI empires, especially if advanced starts are used. The percentages for each unique system to spawn are the following:
Hauer is a unique class G system that will always spawn in the galaxy. It contains a unique object, the Tannhäuser Gate, guarded by 3 Ancient Mining Drones. In addition a planet in the system called Spjuuht will reveal the Never Forget Archaeology Site that can be excavated.
|Chapter 1||Chapter 2||Chapter 3|
|Rewards||1-5 Minor Artifacts||1-5 Minor Artifacts||A Life Worthwhile empire modifier|
Wenkwort is a unique star system that will always spawn in the galaxy. It contains a Gaia world called Wenkwort Artem that has the Wenkwort Gardens modifier as well as a level IV anomaly. When the anomaly is investigated it grants a very large amount of society research and issues a special project on a barren world called Rellrait and creates 3 neutral Ancient Mining Drones that patrol the system. The special project adds a deposit of 3 Society Research to Rellrait and gives it the Terraforming Candidate planet modifier as well as a unique planet modifier granting it +3% Happiness and -15% Upkeep from Jobs.
Wenkwort Artem has a unique planet modifier with the same name. When the planet is first colonized the player will be contacted by a custodian robot and informed that industrialization of the planet is to be kept at a minimum. If the request is accepted Wenkwort Artem will gain a second planet modifier giving it the following effects:
- +40% Culture worker output
- +20% Researcher output
- -30% Artisan output
- -70% Miner output
- -70% Gas refiner output
Refusing will have a fleet of around 7K fleet power arrive in 20 days and give one last chance to accept the modifier before attacking.
Alpha Centauri is a trinary star system that will always spawn as a neighbor of Sol along Barnard's Star, Procyon and Sirius if Sol is chosen as a starting system. Alpha Centauri III will always match the climate preference of the primary species from Earth if guaranteed habitable worlds were enabled. Proxima Centauri b will be a frozen world with the Tidal Locked planet modifier and a level I anomaly. Investigating the anomaly will grant a small amount of Unity and give the planet the Terraforming Candidate modifier.
If none of the starting empires have Sol as their home system there's a 50% chance that it will spawn in the galaxy, Earth being found in one of the following states:
- Late Medieval Age
- Humans are Authoritarian, Spiritualist and Xenophobe and have primitive armies made up of feudal levies. The setting is a reference to Crusader Kings, another game series from Paradox.
- Machine Age
- Humans are Fanatic Militarist and Materialist and have the industrial armies of Nazi Germany, the USSR, the US, the UK and Imperial Japan. In Ironman mode successfully invading at this time will unlock the Outside Context achievement. If they advance to Atomic Age they might start a nuclear war. The setting is a reference to Hearts of Iron, another game series from Paradox.
- Early Space Age
- Humans are Fanatic Egalitarian and Xenophile and have the post-atomic armies of the US, China, Russia and EU. ISS II orbits Earth. If they discover FTL they will become the United Nations of Earth. They cannot start a nuclear war at this stage.
- Nuclear Wasteland
- Humanity has wiped itself out in a nuclear war and Earth is a tomb world. The planet has a unique level I anomaly which when investigated will reveal a species of pre-sapient cockroaches with the Tomb World climate preference and the Adaptive trait.
Trappist is a real life system that has a significant chance of spawning in the galaxy. It contains 3 habitable planets, one from each climate category, making it above or below average depending on the habitable worlds game setting. The features and possible modifiers of all planets are randomized.
|Planet||Trappist I||Trappist II||Trappist III||Trappist IV||Trappist V||Trappist VI||Trappist VII|
The fleet guarding it consists of 7 cruisers named after ice formations. The fleet is hostile, however it is not set to aggressive stance, simply blocking any approach to the system's star. After they are defeated the system can be claimed as usual. The cruisers use the following loadout:
The planet contains an archaeological site named One Last Hope.
|Chapter 1||Chapter 2||Chapter 3||Chapter 4|
|Rewards||1-5 Minor Artifacts||1-5 Minor Artifacts||1-5 Minor Artifacts|| 6-10 Minor Artifacts|
+20% Biology Research Speed
A rare special system, which will be randomly named when generated, contains Zanaam, a size 25 Gaia World with the unique Valley of Zanaam planetary feature and defended by an 11k fleet named Guardians of Zanaam.
The fleet guarding it consists of 24 destroyers, named from Alpha to Omega, which look like Ancient Mining Drones but use far more advanced components. Upon entering the system, the player is given a message stating they will be destroyed. The fleet is hostile, however it is not set to aggressive stance, simply blocking any approach to the system's star. After they are defeated the system can be claimed as usual. The destroyers use the following components:
Parvus is a class k star system which contains a size 22 Desert World with a level VI anomaly. Investigating it will give the planet a nanite swarm modifier that ensures 0% Habitability and Happiness if the planet is colonized as well as issue a special project. The special project requires 300 days to be completed and brings 3 options:
- Studying the swarm grants the Administrative AI technology. If already researched it will grant a moderate amount of Physics Research instead.
- Destroying the swarm requires a fleet of 2K fleet power to be brought in orbit of the planet, removes the modifier and gives the planet the Nanite Swarm Remains planetary feature.
- Taming the swarm requires the Self-Evolving Logic technology and starts another special project that requires 300 days. Finishing it clears all blockers from the planet, terraforms it into one that matches the primary species' climate preference and replaces the modifier with Tamed Nanite Swarm.
Sanctuary is a system containing an abandoned ring world of previous Enigmatic Observers. Originally created to act as a nature preserve and house primitive life, the system was abandoned but left guarded by multiple defense platforms of approximately 42k fleet power. Upon discovering the system an empire is contacted by the automated defense facility, which explains the history and purpose of the facility. Every message ends in "Do not approach this facility under any circumstances" and indeed the defenses will fire upon any ship that approaches it.
The Sanctuary defenses contain the following stations:
|1 Sanctuary Core
||4 A-1 Fortresses||11 A-2 Outposts|
Despite having no engine modules, stations are, in fact, mobile, and therefore cannot be engaged with artillery ships from a safe distance, one by one. Defeating them may prove a challenge but destroyed platforms are not rebuilt, allowing the system to slowly be overtaken.
The ring world is almost completely intact and each habitable segment houses a randomized pre-FTL species, none of them advanced beyond the Steam Age. Any empire that manages to defeat the platforms can lay claim to the extremely valuable system and decide the fate of the inhabiting species. It should be noted that since the species have evolved and reached sapience on the ring world they have the Ring World climate preference which hampers their ability to colonize without compensatory methods.
A random system in the galaxy will contain an asteroid field where one of the large asteroids is orbited by an Ancient Manufactory identical to the Mining Drone stations. Surveying the asteroid will reveal a level III anomaly. Investigating it will bring the option to either:
- Leave the manufactory alone. Xenophobe and Fanatic Xenophobe empires will gain 100 Influence from this option.
- Start a Special Project to restore the manufactory with a fleet. Not available to Fanatic Xenophobe empires. Possible outcomes are granting the Rare Crystals Manufacturing technology, launching the manufactory into the star and awakening 3 hostile Ancient Mining Drones or Crystalline Entities. If the system has been claimed another possible outcome is turning the manufactory into a mining station and adding a deposit of 10 Minerals to the star.
A system that can only spawn bordering the Xenophobic Isolationists may contain Shallash, a Tomb World orbited by 6 moons equidistantly that contains the Ruined Star System Archaeology Site that can be excavated. The system also contains multiple Minerals deposits. It is patrolled by a Xenophobic Isolationists battlecruiser.
|Available only with the Utopia DLC enabled.|
If the Distant Stars DLC is also installed the star has a 50% chance to contain a unique level VI anomaly. Investigating it will add a deposit of +3 Physics to the star. If the empire is Fanatic Purifiers or Determined Exterminator it will gain 125-250 Influence and 100-500 Unity. Otherwise investigating the anomaly will bring the option to either:
- Issue a special project to thaw the clones. The project takes 30 days to complete and will create on a random world two Pops of a species with the Proles, Strong, Nerve Stapled and Tomb World climate preferencetraits. If the empire has the Devouring Swarm civic it will instead gain 350-2000 Food and 100-500 Unity.
- Leave the clones in stasis and a deposit of +4 Society Research to the star. If a ringworld segment is repaired and colonized the empire will get the option to either instantly thaw the clones and create on the colonized segment two Pops of a species with the Proles, Strong, Nerve Stapled and Tomb World climate preference traits or leave the clones in stasis and add the Cryonic Clones Monument planetary feature to the colonized segment.
Distant Stars systems
|Available only with the Distant Stars DLC enabled.|
A random pulsar system in the galaxy might contain a Tomb World planet called Ruinous Core orbited by a Tomb World moon called Lost Encampment, as well as various debris throughout the system. A similar nearby system will contain three Tomb Worlds: Silent Colony, Decayed Hub and Crumbling Borough. A second nearby system will contain a Tomb World called Fallen Outpost. Unlike other Distant Stars systems, these systems will give a notification when one is entered for the first time. Surveying Ruinous Core will reveal a level II anomaly. Investigating it will grant a significant amount of Society research.
25 to 35 years after the first system has been entered a species called Ketling will emerge in any of the three systems that haven't been claimed by an empire. A special project will be added to investigate any Tomb World in one of those systems and doing so will grant a large amount of Society research.
Planets with Ketlings cannot be colonized but can be invaded. If invaded they will suffer a 5 years Culture Shock identical to invading an Early Space Age civilization.
Another 25 to 35 years after the Ketling have emerged they will become the Ketling Star Pack. All their planets will be filled with buildings and they will get 10 armies and a fleet of 8 cruisers, 8 destroyers and 10 corvettes. If any of their systems have been invaded or claimed with a starbase they will have a temporary -20 Opinion towards the Starbase's owner empire.
The exact delay of both the species emergence and the empire creation are set at the moment the preceding event occurs, so reloading a save prior to their appearance will not change the delay unless the save is far enough back.
Sea of Consciousness
A random binary star system might contain a size 24 Ocean World with a unique appearance that does not contain landmasses among other uninhabitable planets. The planet has no blockers and has a Betharian Fields planetary feature. It also has a unique planet modifier granting it the following:
- +25% Habitability
- +10% Research from Jobs
- -25% Governing Ethics Attraction
- -25% Planetary Build Speed
The modifier is removed if the planet is terraformed into anything except a Continental or Gaia World.
Surveying the planet will reveal a level V anomaly. Investigating it will not grant anything to a Gestalt Consciousness empire but will grant other empires a moderate amount of Society research and the option to unlock a unique decision. The decision does not require colonizing the planet but still needs a starbase in the system and costs 500 Energy. Within half a year a scientist leader will request to leave for the planet and bring three options:
- Allow the scientist leader to leave. One year later the empire will gain a random Psionics technology. If all technologies are researched it will instead grant a large amount of Physics and Society research.
- Disallow the scientist leader to leave. 3 months later the scientist will die. 10 years later the empire will gain a random Psionics technology. If all technologies are researched it will instead grant a large amount of Physics and Society research.
- Remove the scientist Leader, ending the event chain.
- If the scientist is dead, you will get a random psionic technology in 10 years instead of 6 months.
Twin Tomb World Civilizations
This star system contains two Tomb Worlds, both with humanoid Bronze Age civilizations. Surveying the second Tomb World will reveal a level III anomaly. Investigating it will grant a moderate amount of Society research. The species are always the following:
This system will not spawn if primitives have been disabled.
A class B star system contains a Shielded World typically called Gish showing a desert planet underneath, although the name may vary. Surveying will reveal a level IV anomaly. Investigating it will bring the option to either:
- Repair the shield with a science ship to add a 8 Physics and 4 Society deposit to the world for a few decades.
- Interrupt the time loop with a science ship, gaining a small amount of Physics research. There is a 50% chance of the world turning into a tomb world and a 50% chance of creating the Prikkiki-Ti empire.
- Leave the planet alone and gain 150 of Physics and Society research. Around a decade later the Prikkiki-Ti empire will emerge.
One anomaly in the galaxy might be called The Vechtar Zavonia when successfully investigated, describing a planet called Paridayda and a species called Mardak Vol. Choosing the option to search for the planet will start a special project. Finishing it will create a neighbor system and point to a Barren World inside. Choosing to investigate further when entering the system will start a special project to investigate the planet with a science ship. Finishing the special project takes 60 days and will reveal the planet as a size 25 Gaia World with the Stone Age Mardak Vol civilization and the unique Paridayda planet modifier.
A few days after the system has been claimed a species called the Vol will arrive with a fleet to purge the Mardak Vol. Accepting will destroy the civilization and add a removable blocker to the planet. Refusing will have the fleet attack the system. If their fleet is not defeated they will bombard the planet with the Armageddon stance. Once all Mardak Vol pops are killed by bombardment all tiles on the planet will get 4 removable blockers.
Accepting is the recommended course of action as not only does it avoid the fight but the Mardak Vol would take a long time to enlighten or remove Stellar Culture Shock and have the Gaia World climate preference. In addition if the planet is colonized the colonists will gain +10% Happiness for 10 years.
- Abandoned Observation Post
- This class F star system contains an Abandoned Observation Post orbiting a habitable world. Surveying the planet will reveal a level IV anomaly. Investigating it will bring the option to either:
- Abandoned Star Platform
- This system contains an Abandoned Star Platform orbiting a pulsar star. Surveying the star will reveal a level IV anomaly. Investigating it will bring the option to start a 60 days special project to either:
- Caretaker Escape Pod
- This binary star system has as its last planet a Gas Giant with escape pods in orbit. Surveying the planet will reveal a level III anomaly. Investigating it will bring the option to either ignore the pod for a small amount of Influence or hail it and get the following options:
- Valid if AI is not outlawed: Accept Caretaker AX7-b as a leader, gaining a level 4 governor Leader.
- Valid if AI is not outlawed: Examine Caretaker AX7-b for a moderate amount of Engineering research.
- Valid if AI is outlawed: Destroy the pod for a small amount of Influence.
- Valid if Machine Intelligence: Recycle Caretaker AX7-b for a small amount of Minerals and Engineering research.
- Gaia Civilization
- This class M star system contains a Gaia moon orbited by a derelict station. Surveying the moon will reveal a Stone Age molluscoid civilization with the Extremely Adaptive, Slow Breeders, Sedentary and Gaia World climate preference traits, as well as a level VI anomaly. Investigating it will grant a significant amount of Physics and Society research. This system will not spawn if primitives have been disabled.
- Rudimentary Robots
- This star system contains a single habitable world with the Metal Boneyards planetary feature among other uninhabitable planets. Surveying the planet will reveal a level I anomaly. Investigating it will add 3 or 4 robot Pops on the planet. After the planet is colonized you will be given the option to either:
- Regardless of the chosen option, around 5 years after the planet has been colonized a number of colonists will gain the Erratic Behavior modifier, giving -25% to Happiness, Governing Ethics Attraction and Resource Production, and a special project to investigate it will be added, costing 60 Society research. Finishing the research project grants a random Biology technology. If the special project is not completed in 4 months three enraged colonists armies will form and attempt to occupy the planet.
- This class G star system contains a number of uninhabitable planets and a gas giant with multiple moons, one of them being a Tomb World with the unique Irradiated Valley planetary feature. Another one of the planets is a frozen world with a level I anomaly. Investigating it will add a 4 Society deposit to the world. The star also has a 3 Physics deposit instead of a regular Energy one. A year after the planet is colonized a special project will be added to shield the colony with a science ship. The project takes 30 days to complete and gives the planet a +10% Unity from Jobs modifier. The scientist will also gain the Expertise: Field Manipulation trait. If the project is not started in 150 days one pop will die and the planet will get -10% Habitability and -15% Energy from Jobs for 20 years.
- The Veil
- This binary star system contains a planet that will appear either as a Gaia World or a Shrouded World. Surveying it will reveal the Phase-Shifted planet modifier (-50% Planet Build Speed) and the only level X anomaly besides certain precursor anomalies in the game. Investigating it will describe how every 3 months the planet shifts between a Gaia World and a Shrouded World and grant a moderate amount of Physics. Once the system has been claimed you will be given the option to either:
- Great Wound
- This system consists of a large central black hole orbited by several smaller ones. Three void cloud fleets with 20K power patrol the system. The central black hole has a guaranteed large deposit of 10 Dark Matter. Added since DS.
- Broken Ringworld
- A few segments of a broken ringworld orbiting a black hole, probably formed when the original star went supernova. Void clouds patrol the system, and Dark Matter can be found. Added since DS.
Ancient Relics systems
|Available only with the Ancient Relics DLC enabled.|
Shielded Relic system
A random binary system in the galaxy will always contain a size 25 Shielded World guarded by a fleet of 5k fleet power with ships identical to the ones guarding Zanaam. Surveying either the Shielded World or its moon will reveal a unique Archaeology Site that can be excavated.
A random system in the galaxy will always contain a Relic World. Surveying it will reveal the unique Ruined World Archaeology Site that can be excavated.
|Chapter 1||Chapter 2||Chapter 3||Chapter 4|
|Rewards||1-5 Minor Artifacts||None||1-5 Minor Artifacts|| 10-30 Minor Artifacts|
The Omnicodex Relic
A random binary system in the galaxy might contain a Relic World. Surveying it will reveal the Planetary Machinery Archaeology Site that can be excavated.
|Chapter 1||Chapter 2||Chapter 3||Chapter 4||Chapter 5||Chapter 6|
|Rewards||120-350 Society research|| 120-350 Society research
1-5 Minor artifacts
|2 Minor artifacts||1-5 Minor artifacts||1-5 Minor artifacts||120-350 Engineering research|
Finishing the excavation will open a dialogue window with C.A.R.E. Interactive Interface. Agreeing to help it will issue the Develop A Cure For The Ferrophage Special Project. Finishing it takes 10 years and grants the Defragmentor Relic while the Relic World gains a permanent +10% Energy from Jobs modifier. Refusing will grant 100 Influence instead.
- This system will not appear if the Apocalypse DLC is enabled, Privateers being replaced by the Marauders.
A random system in the galaxy will be home to the Privateers, a group of 3 pirate fleets which must be defeated:
- Young Blood contains 12 corvettes and uses tier I components
- Scarred Veterans contains 4 corvettes, 16 destroyers and 20 cruisers, and uses tier II components
- Old Guard contains a battleship and uses tier III components
All fleets are balanced but have a slight bias towards armor components, making fleets with a slight bias towards energy weapons the counter. However the system's only resources are two asteroids with slightly higher Minerals deposits.