Unique systems can only spawn once per galaxy. Each unique system has an unique event or anomaly related to it.
Spawn chances
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:
Spawn chances
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:
| Galaxy | Trappist | Polaris | Zanaam | Parvus | Sanctuary | Shallash | Sol | Manufactory |  Ruined Ringworld
|
 C.A.R.E.
|
 |
|
  Ruined megastructures
|
Guaranteed systems |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tiny | 20% | 10% | 6% | 6% | 4% | 6% | 50% | 25% | 6% | 16% | 16% for each system | 16% for each system | 8% for each system | Hauer Hillos Klendath Orvall Wenkwort At least one Curator enclave system At least one Artisan enclave system XuraCorp enclave system Corrupted Avatar system Omni system Shielded Relic system
|
| Small | 40% | 20% | 12% | 12% | 8% | 12% | 50% | 25% | 12% | 32% | 32% for each system | 32% for each system | 16% for each system | |
| Medium | 60% | 30% | 18% | 18% | 12% | 18% | 50% | 25% | 18% | 48% | 48% for each system | 48% for each system | 24% for each system | |
| Large | 80% | 40% | 24% | 24% | 16% | 24% | 50% | 25% | 24% | 64% | 64% for each system | 64% for each system | 32% for each system | |
| Huge | 100% | 50% | 30% | 30% | 20% | 30% | 50% | 25% | 30% | 80% | 80% for each system | 80% for each system | 40% for each system |
Hauer
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 | |
|---|---|---|---|
| Difficulty | 1 | 2 | 2 |
| Rewards |  1-5 Minor Artifacts
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1-5 Minor Artifacts
|
 A Life Worthwhile empire modifier
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Hillos
Hillos is a unique star system that will always spawn in the galaxy. The system contains an alien science ship marked as hostile. One of the planets is a Tundra World that when surveyed will reveal a level III anomaly. Investigating it will issue a special project that takes 360 days to research. Completing the special project grants 350-100000 
Klendath
Klendath is a unique star system that will always spawn in the galaxy. It contains two barren worlds and a moon and is defended by an Ancient Mining Drone. In addition the planet Klendath I will reveal the Crashed Starship Archaeology Site that can be excavated.
| Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 | Chapter 6 | |
|---|---|---|---|---|---|---|
| Difficulty | 2 | 3 | 4 | 5 | 6 | 7 |
| Rewards | 1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts
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10-30 Minor Artifacts
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Orvall
Orvall is a unique star system that will always spawn in the galaxy and unlike every other system is not named after the central star. The system has a golden nebula visual effect regardless of whether it is spawned inside one or not and is guarded by a small Tiyanki fleet. The system is uninhabitable but one broken world, always named Moor-Hsrettu, contains the Desiccated archaeology site.
| Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 | |
|---|---|---|---|---|---|
| Difficulty | 2 | 4 | 4 | 6 | 5 |
| Rewards | 1-5 Minor Artifacts
|
1-5 Minor Artifacts
|
1-5 Minor Artifacts
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1-5 Minor Artifacts
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After 60 days can choose between 700-4000   |
Wenkwort
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 that provides +20% 
Administrator output and +10% 
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% Administrator output
- +20%
研究人员 output - -30%
工匠 output - -70%
矿工 and Strategic Resource Gatherer output - -70%
气体精炼工 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
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 
Sol
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
威权主义 ,
唯心主义 and
排外主义 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
极端军国主义 and
唯物主义 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
极端平等主义 and
亲外主义 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
死寂星球偏好 World climate preference and the
善于适应 trait. If the 上古之遗故事包 DLC is installed terraforming Earth has a 50% chance to reveal the Weapons Cache archaeological site.
Trappist
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 well above average, compared to the default game setting for habitable worlds. 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 |
|---|---|---|---|---|---|---|---|
| Class |  Molten
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 Barren
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 Toxic
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 Desert
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 Continental
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 Arctic
|
|
| Size | 16 | 16 | 12 | 14 | 16 | 18 | 12 |
Polaris
Polaris is a trinary star system which contains a size 23 Ocean World with the unique 
Ancient Sunken City planetary feature and defended by an 3k molluscoid fleet named Polarian Automated Fleet.
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:
| Weapons | Utility | Core |
|---|---|---|
|
|
|
The planet contains an archaeological site named One Last Hope.
| Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | |
|---|---|---|---|---|
| Difficulty | 3 | 1 | 3 | 6 |
| Rewards | 1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts
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6-10 Minor Artifacts +20% Biology Research Speed
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Zanaam
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:
| Weapons | Utility | Core |
|---|---|---|
|
|
|
Parvus
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% 
- Studying the swarm grants the
管理型人工智能 technology. If already researched it will grant a moderate amount of 物理学研究 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
自我演化逻辑 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. If you are Void Dwellers it will terraform to a Gaia world.
Sanctuary
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 
Ancient Manufactory
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.
排外主义 and
极端排外主义 empires will gain 100
影响力 from this option. - Start a Special Project to restore the manufactory with a fleet. Not available to
极端排外主义 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 
矿物 to the star.
Shallash
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
| Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | |
|---|---|---|---|---|
| Difficulty | 1 | 2 | 3 | 4 |
| Rewards | 1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts
|
10-30 Minor Artifacts   Next level of terraforming technology if the Xenophobic Isolationists were not defeated    Next level of robotic pops technology if the Xenophobic Isolationists were defeated and the main species is biological 700-4000 Unity if the Xenophobic Isolationists were defeated and the main species is robotic
|
Ruined Ringworld
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只可用于 Utopia DLC 已启用。 |
A random system in the galaxy will contain a ruined ringworld. As with all ruined megastructures the ringworld can be repaired if the empire has the 
If the 
- 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 
无产者 ,
强壮 ,
精神阉割 and 死寂星球偏好 World climate preferencetraits. If the empire has the
噬杀蜂群 civic it will instead gain 350-2000
食物 and 100-500 凝聚力 . - Leave the clones in stasis and a deposit of +4
社会学研究 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 无产者 , 强壮 , 精神阉割 and 死寂星球偏好 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
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只可用于 Distant Stars DLC 已启用。 |
Junk Rattlings
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
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
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 
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 
- Allow the scientist leader to leave. One year later the empire will gain a random
灵能理论 technology. If all technologies are researched it will instead grant a large amount of 物理学研究 and 社会学研究 research. - Disallow the scientist leader to leave. 3 months later the scientist will die. 10 years later the empire will gain a random
灵能理论 technology. If all technologies are researched it will instead grant a large amount of 物理学研究 and 社会学研究 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
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This system will not spawn if primitives have been disabled.
Gish
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
物理学研究 and 4 社会学研究 deposit to the world for a few decades. - Interrupt the time loop with a science ship, gaining a small amount of
物理学研究 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
物理学研究 and 社会学研究 research. Around a decade later the Prikkiki-Ti empire will emerge.
Paridayda
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 
Other systems
- 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:
- Investigate the observation post with a science ship to gain a moderate amount of
社会学研究 research. - Leave the observation post alone for 50
影响力 .
- Investigate the observation post with a science ship to gain a moderate amount of
- 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:
- Repair the platform with a construction ship to add a 6
能量币 deposit to the pulsar. - Salvage the platform with a science ship to gain 20% to the next level of
lasers technology.
- Repair the platform with a construction ship to add a 6
- 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
影响力 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
影响力 . - Valid if
机械智能 : Recycle Caretaker AX7-b for a small amount of 矿物 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 
极易适应 ,
缓慢繁殖 ,
安土重迁 and 盖亚星球偏好 World climate preference traits, as well as a level VI anomaly. Investigating it will grant a significant amount of 物理学研究 and 社会学研究 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:
- Dismantle the robot Pops and gain 100
矿物 . - Keep using the robots. 90 days later a special project to investigate the robots with a science ship is given. Finishing the special project takes 30 days and gives a large amount of
社会学研究 research.
- Dismantle the robot Pops and gain 100
- 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
幸福度 , 主流思潮吸引力 and Resource Production, and a special project to investigate it will be added, costing 60 社会学研究 research. Finishing the research project grants a random
生物学 technology. If the special project is not completed in 4 months three enraged colonists armies will form and attempt to occupy the planet. - Superflares
- 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 社会学研究 deposit to the world. The star also has a 3 物理学研究 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% 凝聚力 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% 宜居性 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
物理学研究 . Once the system has been claimed you will be given the option to either:- Leave the planet for a moderate amount of
影响力 . - Start a special project to use a science ship to freeze the phase-shift. The project takes 180 days and finishing it permanently sets the planet to a Gaia World. It will also grant a moderate amount of
物理学研究 research.
- Leave the planet for a moderate amount of
- 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
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只可用于 Ancient Relics DLC 已启用。 |
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.
| Site | Chapter 1 rewards | Chapter 2 rewards | Chapter 3 rewards | Chapter 4 rewards |
|---|---|---|---|---|
| Moon Base | 1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts The Shielded World is turned into a Relic World with the Abandoned Ecumenopolis Archaeology Site
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| Abandoned Ecumenopolis | 1-5 Minor Artifacts
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1-5 Minor Artifacts
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1-5 Minor Artifacts
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10-30 Minor Artifacts Miniature Galaxy Relic
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Omni system
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 | |
|---|---|---|---|---|
| Difficulty | 4 | 4 | 5 | 6 |
| Rewards | 1-5 Minor Artifacts
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None | 1-5 Minor Artifacts
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10-30 Minor Artifacts The Omnicodex Relic
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C.A.R.E.
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 | |
|---|---|---|---|---|---|---|
| Difficulty | 3 | 3 | 3 | 4 | 4 | 5 |
| Rewards | 120-350 Society research
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120-350 Society research 1-5 Minor artifacts
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1-5 Minor artifacts
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1-5 Minor artifacts
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120-350 Engineering research
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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
Privateers
- This system will not appear if the
启示录 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