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Stellaris Dev Diary #376 - Announcing BioGenesis and Stellaris: Season 09

Metal rusts. Flesh adapts.​


It’s my great pleasure to announce the start of Stellaris: Season 09, with the BioGenesis expansion leading the way alongside the Stellaris 4.0 ‘Phoenix’ update.


The future of evolution is here. BioGenesis continues our remastering of the Ascension Paths by granting you unprecedented power over life itself and hatches May 5th, 2025.


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Evolution had its chance. Now it’s our turn.​

Two Biological Shipsets

Command living fleets that evolve alongside your empire. Customize these genetic marvels for specialized roles, from ferocious Maulers to adaptable support Weavers, each capable of empowering allies and weakening foes.

Three New Origins
  • Evolutionary Predators: Push the boundaries of Species Traits by unlocking and combining unique phenotype abilities to craft the ultimate adaptive empire.
  • Starlit Citadel: Solve the mystery of your empire’s biological attackers while boosting hyperlane choke-point strategies with early access to the Deep Space Citadel megastructure.
  • Wilderness: Begin as a sapient planetary ecosystem, a living gestalt of countless lifeforms united in harmony, seeking to spread its consciousness to the stars.
Overhauled Genetic Ascension

Choose from three Ascension paths (Cloning, Purity, and Mutation) and over 18 enhanced Authorities. Customize your genetic ascension by blending Purity, Cloning, and Mutation traditions into a unique path for your play style.

Hives with a Twist

Encounter a Hive Fallen Empire, a fractured hive mind struggling to awake between its three splintered personalities.

Six New Civics
  • Genetic Identification, Crowdsourcing, Familiar Face, Aerospace Adaptation, Shared Genetics, Civil Education
Deep Space Citadel Megastructure

A versatile new defensive station capable of holding off powerful enemy fleets at any system.

Behemoth Fury Crisis Path

The apex predators of the stars are not bound by petty limitations. Cast off the biological weaknesses that hold you back, and become a force of nature.

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The BioGenesis expansion includes:​

  • Gestalt Hive Empires (also unlocked by Utopia)
  • Two biological Shipsets with distinct mechanics from traditional spacecraft
  • Three new Origins
    • Evolutionary Predators
    • Wilderness
    • Starlit Citadel
  • Civics
    • Genetic Identification
    • Crowdsourcing
    • Familiar Face
    • Aerospace Adaptation
    • Shared Genetics
    • Civil Education
  • Deep Space Citadel Megastructure
  • Biological Ascension (also unlocked by Utopia)
    • Expanded with BioGenesis to include a mutable tradition tree that reflects your path through Ascension
  • Exploration of the effects of Biological Ascension on society
  • Advanced Government Forms
  • 16 new genetic Species Traits, including phenotype based traits
  • Portraits that change based on pop strata and leader level
  • The Splintered Hive Fallen Empire
  • Two Diplomatic Rooms and City Sets
  • 7 music tracks
  • And a new Player Crisis Path - Behemoth Fury

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Planned Dev Diary Schedule
March 27​
Biological Ships and Mechanics​
April 3​
Ascension, Traditions, Advanced Governments​
April 10​
Phenotype Traits, Evolutionary Predators Origin​
April 17​
Deep Space Citadel, Starlit Citadel Origin​
April 24​
Hive Fallen Empire, Wilderness Origin​
May 1​
Civics, Behemoth Fury, Preliminary Release Notes​
May 5​
BioGenesis Release Date​


Stellaris: Season 09 Expansion Pass​

The Stellaris: Season 09 Expansion Pass is your gateway to an entire year of cosmic evolution, psionic mysteries, and apocalyptic infernos. With instant access to the exclusive Stargazer Species Portrait, this expansion pass delivers three major content packs that will redefine the Biological and Psionic Ascensions and the most ambitious species pack so far!

Purchasing the Expansion Pass grants access to all four DLCs as soon as they become available.

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Stargazer Species Portrait (Instant Unlock)​

Dream of the stars with this exclusive portrait, available immediately upon purchasing Stellaris: Season 09. Featuring three variations and unique animations, the Stargazer Species Portrait is perfect for players who seek to embody the spirit of cosmic curiosity.

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BioGenesis (Releases May 5, 2025 - $24.99)​

Take command of the forces of life itself in Stellaris: BioGenesis. Engineer living ships and wield advanced genetic tools to shape the destiny of your empire. Will you create a utopia of adaptation and growth or weaponize biology to dominate the stars?

  • Overhauled Genetic Ascension: Choose from three distinct paths—Cloning, Purity, and Mutation—and customize your evolution.
  • Living Ships: Command biological starships that evolve alongside your empire.
  • Player Crisis Path: Unleash the unstoppable Behemoth Fury on the galaxy.
  • Three New Origins: Play as evolutionary predators, a sapient planetary ecosystem, or a fortress civilization.
  • New Megastructure: Construct the Deep Space Citadel to control hyperlane choke points.

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Shadows of the Shroud (Releases Q3 2025 - $19.99)​

The psionic plane holds untold power—but at what cost? Shadows of the Shroud is a complete overhaul of the Psionic Ascension path, introducing new moral dilemmas, Patron allegiances, and a whole new way of interacting with the mysteries of the Shroud.

  • Breach into the Shroud: Shape your empire’s spiritual destiny with a revamped Shroud system.
  • Shroud Panel: Track your empire’s attunement and unlock new powers.
  • Revamped End of the Cycle: The ultimate deal with the devil—can you delay the inevitable?
  • Psionic Auras: Let your Shroud influence shape entire star systems.
  • New Content: Origins, civics, ships, government types, and more!

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Infernals Species Pack (Releases Q4 2025 - $12.99)​

Forge your destiny in the Stellaris: Infernals Species Pack - our most ambitious Species Pack ever. Adapted to relentless heat and volatile landscapes, you wield the power of extreme environments to reshape the galaxy. Will your empire thrive in the heat, or be consumed by the very forces it seeks to command?

  • Player Crisis Path: Burn the galaxy to ashes as your empire thrives in destruction.
  • New Origins: Unearth ancient kin or endure the scorching wrath of a dying sun in two new Origins.
  • Volcanic Worlds: A new planetary class with unique districts, events, and archaeological sites.
  • New Species & Customization: Ships, portraits, civics, and more!

The Stellaris: Season 09 Expansion Pass is now available for purchase for $44.99 or regional equivalent, a 20% discount over purchasing the contents individually.​


What’s Next?​

This Thursday we’ll flesh out the bio-ships!

See you then!

MEAT SHIPS! MEAT SHIPS! MEAT SHIPS!


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BioGenesis is now available for pre-purchase for $24.99 or regional equivalent,
or with a 20% discount as part of the Stellaris: Season 09 Expansion Pass, which is available now for $44.99 or regional equivalent.
 
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INFERNAL POLITICS CONFIRMED!!!

Wait.

I think this is a *reasonable* explanation, but I want *more* ... Stellaris should not be limited by 'reasonable', with the wonders of golden-age sci fi and comics to draw on. So far, the main nine habitable planet types and classes have arguably all been fairly close to Earth normal and thus each other; you could make a fairly good case that 20% habitability for off-class is less than it should be even with modern technology.

And the inability to settle or terraform Frozen Worlds in particular is frustrating; it's not significantly more difficult than the tech needed for living in space, but you have all these volatiles and raw materials just lying about to be used, and free gravity. Far less energy than it takes to crack a world would suffice to melt it.

Classic science fiction has beings that live much further off the Earth-surface-norm than Stellaris. I recall one story that incidentally had a race that had evolved on Triton, where you see a scene that is described as if it were an Earth steel mill, with the inhabitants clad in multi-layer reflective suits and long tongs as they worked with the enormous and deadly heat required to smelt and cast *molten ice* (ie, water). Similarly, "lava / magma men from the depths" is certainly a pulp trope (although they are much more likely to be from the mantle subduction zones than the core, logically speaking).

If we're getting an expansion titled Infernals, I want mantle races that can come up under the subterranean lithoids and complain about the squishy surface dwellers. I want families that can go for a pleasant outing on Mustafar to picnic by the lava falls and enjoy the refreshing spray. I want people that when a portal opens up downtown to literal flaming hell, go "ooh, free real estate" and start a land rush that ends up being a version of Gate played out at 1,200 degrees C. Kids that set up crude stands on the sidewalk to sell a cool, refreshing glass of lead to their neighbors on a summer's day.

And I want a Cryo expansion that does the same in the other direction. "Heliotic" races evolved to live in cryogenic superfluids at 2 degrees K. Cryo-lithoids who live around one of the other triple points of water at the Ice VII / Ice VIII / Ice X interface.

All planets are habitable... it's just a matter of by whom.

I think even in a world where molten worlds can be colonized under the right circumstances, it still makes sense to add a separate Volcanic World type as a bridge between them and more conventional worlds.

Beyond that, I absolutely agree that Molten Worlds should become terraformable.
 
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How biogenesis will interact with fauna fleets? Will fauna have some buffs regarding ascension paths?
 
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May just keeps getting better. My birthday, 3 of my favorite light novels releasing a new volume, a higher performance pop/economy system, and now this? How exciting.

The thing I am most curious about is the Deep Space Citadel, as I have been suggesting a starbase type megastructure for some time now.
 
Ok, it's settled.
Laser only weapons to make sure those fine cut are precise, Nobody wants to find a piece of metal in their steak.
Also, My admirals formation curriculum should have gastronomy classes.
"The great BBQ of Parvus was the best."
 
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Hi y'all

While watching the trailer for Season 9 I thought of an idea, it might be for Stellaris 2 because I don't know how hard implementing it would be
Essentially what if besides battle sound effects we heard commands given out by commanders of the ships or death cries when looking at the place the battle is taking place. I think this tiny detail would add some depth to the battles.

Thanks for reading!
 
I am suspicious about a lot of this. While the new ascensions look good, the crises paths just seem forced. As bad as Nemesis's flavor was it made sense to call it a crisis. Cosmogenesis is no more evil than your next door Fanatic Xenophobe Slaving Despot, and these look like they won't be much different.

And also can you please, please, PLEASE look at the mess that is Zones and Districts? It's an unfun, overcomplicated and unintuiative mess.

But hey, hail Hive FE. Egal, Auth, Milit, and Pacifist FE when?
 
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diplomacy, war and espionage all work great
and there's a lot of events, origins and civics that simulate internal politics
Great is a stretch. I like the espionage system actually, I just wish it had far more content, more events and more impactful and numerous operations.
 
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I am unbelievably happy that the bio path is getting some much needed love. Adding extra traits and more ways to create unspeakable horrors is my favourite.

I am slightly worried if psionic ascension isn't getting the same treatment as bio and mech paths, but the info on shadows of shroud is still very vague so too early to tell. Hoping for the best.
 
I am suspicious about a lot of this. While the new ascensions look good, the crises paths just seem forced. As bad as Nemesis's flavor was it made sense to call it a crisis. Cosmogenesis is no more evil than your next door Fanatic Xenophobe Slaving Despot, and these look like they won't be much different.

Galactic nemesis is a tonal mess I’ll give you that. It can’t decide if it’s meant to represent intellects vast, cool, and unsympathetic with eldritch hypertech or WAAAGH! hordes with ships made out of scrap. You have to really squint to find a link between accumulating menace and the unlocking of tech, up to the final goal of blowing up the galaxy by invading the shroud.

Cosmogenesis is much better that respect but it’s certainly more of a threat than a typical empire. Not only can the reality warping tests cause great damage but completing cosmogenesis detonates a bunch of stars, wipes out a bunch of planets, and creates devastation on all the rest. It might not be galaxy ending but it’s definitely damaging.

If anything the issue with cosmogenesis is that a lot of people take it as a dip so they can get fancy technologies without actually having do do any of the crisis parts.
 
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Expanded with BioGenesis to include a mutable tradition tree that reflects your path through Ascension
A tradition tree that changes depending on which picks we make?
I.e. with there being something like 10-20 potential traditions, with 3 available at the start and picks becoming available or unavailable depending on previous picks?

Also:
  • Will the (base) game get replicants / biological androids (Blade Runner)?
  • Will there be amorphous / blobby portraits?
  • Will it be possible to create something like the Umgah?
    Would that correspond to the Mutation path?
  • Will there be any actual meat planet, i.e. a planet made of meat (i.e. not the Wilderness origin)?
    Perhaps with potato-shaped moons, and the possibility of a leader with the Corrupt trait eating a recovered scientific sample?
 
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To be clear, are there now phenotype traits for each phenotype? Obviously it's new ones, and that's pretty cool, but the big draw about that part for me is if this means every phenotype has something unique.
For example

Reptilian - Cold Blooded > Bonuses in hot planets, penalty in cold ones.
Mammalian - Placental > Slower growth but cognitive bonuses.
Insectoid - Exoskeletons > Molting, Tomb World habitability.

Could be lots of things, specially if they made habitability have an even bigger impact.
 
Im super hyped for this but i have a big question for devs that im a bit worried about. The other 2 ascensions reworking dlcs have their own crisis path themed to it, but i saw no mention of one in the shroud dlc notes here or on steam. Now yes i agree that the galactic crisis is pretty much the (psionic crisis path) but i feel that compared to the cosmogenesis its lacking and a bit bland. (heck the infernal species pack is getting one) There is zero variation (even if its mostly lore or flavor), its kind of a hyper evil path compared to the cosmogenesis (although the behemoth one does seem also pretty aggressive) and its unique structures and ships to me look pretty bland and generic compared to what cosmogenesis got.

So i was wondering is there plans to rework the galactic crisis path to make it more up to speed with the other crisis paths at the same time as the shroud dlc? Also no shroud ships or ascending to energy beings?:( Like yes the end of cycle is also getting a revamp but i dont think they really count as a crisis path.
 
Living spaceships? Finally? Shut up and take my... oh wait, you can take my money. Here, have some money.

...

I don't see what Deep Space Citadel Megastructures or Fortress Origins have to do with the rest of it and they feel like something that should have been folded into a previous, more thematic expansion but that's because I'm a miserable old grinch.

e: Starlit Citadel: Solve the mystery of your empire’s biological attackers while boosting hyperlane choke-point strategies with early access to the Deep Space Citadel megastructure.

Oh it's Harry Harrison's Deathworld. Nevermind, sold!
 
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Im super hyped for this but i have a big question for devs that im a bit worried about. The other 2 ascensions reworking dlcs have their own crisis path themed to it, but i saw no mention of one in the shroud dlc notes here or on steam. Now yes i agree that the galactic crisis is pretty much the (psionic crisis path) but i feel that compared to the cosmogenesis its lacking and a bit bland. (heck the infernal species pack is getting one) There is zero variation (even if its mostly lore or flavor), its kind of a hyper evil path compared to the cosmogenesis (although the behemoth one does seem also pretty aggressive) and its unique structures and ships to me look pretty bland and generic compared to what cosmogenesis got.

So i was wondering is there plans to rework the galactic crisis path to make it more up to speed with the other crisis paths at the same time as the shroud dlc? Also no shroud ships or ascending to energy beings?:( Like yes the end of cycle is also getting a revamp but i dont think they really count as a crisis path.

They mention reworking the end of the cycle. My money would be on that becoming a crisis of sorts.
 
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Im super hyped for this but i have a big question for devs that im a bit worried about. The other 2 ascensions reworking dlcs have their own crisis path themed to it, but i saw no mention of one in the shroud dlc notes here or on steam. Now yes i agree that the galactic crisis is pretty much the (psionic crisis path) but i feel that compared to the cosmogenesis its lacking and a bit bland. (heck the infernal species pack is getting one) There is zero variation (even if its mostly lore or flavor), its kind of a hyper evil path compared to the cosmogenesis (although the behemoth one does seem also pretty aggressive) and its unique structures and ships to me look pretty bland and generic compared to what cosmogenesis got.

So i was wondering is there plans to rework the galactic crisis path to make it more up to speed with the other crisis paths at the same time as the shroud dlc? Also no shroud ships or ascending to energy beings?:( Like yes the end of cycle is also getting a revamp but i dont think they really count as a crisis path.
From the steam page:
Shadows of the Shroud said:
● Breach into the Shroud: Shape your empire’s spiritual destiny with a revamped Shroud system.

● Shroud Panel: Track your empire’s attunement and unlock new powers.

● Revamped End of the Cycle: The ultimate deal with the devil—can you delay the inevitable?

● Psionic Auras: Let your Shroud influence shape entire star systems.

● New Content: Origins, civics, ships, government types, and more!
 
For example

Reptilian - Cold Blooded > Bonuses in hot planets, penalty in cold ones.
Mammalian - Placental > Slower growth but cognitive bonuses.
Insectoid - Exoskeletons > Molting, Tomb World habitability.

Could be lots of things, specially if they made habitability have an even bigger impact.
cold-blooded and placental feel like traits anyone can have
just like anyone can be noxious or aquatic

hell, to a lesser degree you could argue exoskeleton can be for anyone, depending on if you think that the portraits show what the species literally looks like what's shown or if more of a suggestion - also there's some stuff, like the snail, which has an exoskeleton despite not being arthropoid