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Stellaris
Stellaris
4.3|Mar 4, 2026
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Stellaris 4.3 "Cetus" Open Beta Updated (2026-03-04)

4/5 Significant

Major rework of the Pop Group system to improve performance and UI clarity, alongside a significant overhaul of the Synthetic Fertility origin and Luminary leader traits.

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Key Changes

  • 1Pop Groups are no longer subdivided by Ethics/Factions, using a percentage-based system instead.
  • 2Save game compatibility is broken; players must use a rollback branch for old saves.
  • 3Synthetic Fertility origin overhauled: removed starting techs, halved pop death rate, and added scaling output.
  • 4Oppressive Autocracy rework moves Enforcers and Telepaths into the Elite strata.
  • 5Significant nerfs to Luminary traits including Pious Ascetic and Enlightened Ruler.
  • 6Planetary automation moved from district level to planet level.
  • 7Cybernetic species trait buffed with +5% Job Efficiency.
  • 8Deep Space Citadel utility slots reduced from 8 to 6 per tier.
  • 9New verbose tooltips for ethics attraction modifiers (Alt key).
  • 10Major stability fixes for multiplayer Out-of-Sync (OOS) errors.

All Changes

👥Pop Systems(4)

  • changePop Groups: Pop groups are no longer divided by Ethics or Factions; each group now uses a percentage-based representation for these values.
  • changePops: Pops now shift ethics and factions more frequently.
  • newUI: Planetary Management UI now displays ethics and factions on pop group entries with attraction tooltips.
  • newUI: Added verbose tooltips for ethics and faction attraction modifiers, accessible by holding the Alt key.

🚀Origins & Factions(7)

  • nerfSynthetic Fertility: Synthetic Fertility no longer starts with Administrative AI, Self-Aware Logic, and Sapient AI technologies.
  • changeSynthetic Fertility: Synthetic Fertility now starts with partial progress toward Administrative AI technology.
  • newSynthetic Fertility: Administrative AI, Self-Aware Logic, and Sapient AI technologies now increase the output of the Identity Repository.
  • changeIdentity Repository: Identity Repository base output reduced, but total output with all technologies is now slightly higher than before.
  • buffSynthetic Fertility: Synthetic Fertility now grants +15% Computing research speed and increased draw chance for AI technologies.
  • buffSynthetic Fertility: Rate at which pops die out in Synthetic Fertility halved from 30/month to 15/month.
  • changeOppressive Autocracy: Reworked Oppressive Autocracy to move Enforcers and Telepaths into the Elite strata.

👑Leaders & Traditions(5)

  • nerfPious Ascetic: Pious Ascetic society research from bureaucrats reduced from +0.5 to +2 down to +0.1 to +0.3.
  • changeHigh King: High King trait changed from 'Resources from Jobs' to '+10% to +30% Job Efficiency for Elites'.
  • nerfEnlightened Ruler: Enlightened Ruler job upkeep reduction reduced from -5% to -20% down to -2.5% to -10%.
  • nerfUnifier: Unifier leader trait unity output reduced from 25% to 15%.
  • buffSpecialist Training: Specialist Training tradition now grants +2% Specialist Job Efficiency per Planetary Governor level.

🤖Cybernetics(6)

  • removeLimited Cybernetic: Removed the Limited Cybernetic species trait.
  • nerfCyberization: Under Limited Cyberization policy, Cybernetic Spiritualist pops no longer benefit from Cybernetic Job Efficiency.
  • buffSpiritualist Faction: Reduced the Spiritualist faction approval penalty for 'The Flesh is Strong' demand.
  • buffCybernetic Trait: Cybernetic species trait now provides an additional +5% Job Efficiency.
  • buffBranching Out: Branching Out modifier from Cyberization situation now grants +10% Trader Job Efficiency.
  • newHive Minds: Hive Minds encountering genetic defects during cyberization can now choose a cyberization policy.

🪐Planetary Management(5)

  • changePlanetary Automation: Job automation moved from district level to planet level.
  • changePlanetary Automation: Adjusted multiple Planetary Automation scripts.
  • changeSpecimens: Specimens now grant +1 Stability per rarity level.
  • changeSpirit of the Unshackled: Spirit of the Unshackled specimen rarity increased to Exceptional.
  • buffManifesti Social Commentary Piece: Manifesti Social Commentary Piece specimen now increases Faction Output and reduces Deviancy for Gestalts.

⚙️Gameplay Systems(2)

  • nerfDeep Space Citadel: Deep Space Citadel utility slots reduced from 8 per tier to 6 per tier.
  • changeMaterialist Empires: Reverted forced Cybernetic portraits for Materialist empires owning The Machine Age.

🐞Bug Fixes(10)

  • fixDecadent Hedonists: Fixed Decadent Hedonists not having the correct Elite upkeep.
  • fixOppressive Autocracy: Fixed various jobs providing amenities for Oppressive Autocracy incorrectly.
  • fixGospel of the Masses: Fixed Gospel of the Masses not increasing trade value from Spiritualist pops on branch office colonies.
  • fixAchievements: Fixed Cetana not granting the Modern Cincinnatus achievement.
  • fixSocial Welfare: Fixed incorrect tooltip for Social Welfare living standard.
  • changeEvents: Limited 'Contact Report' events to one per playthrough.
  • fixCrisis: Fixed inverted trigger logic for Crisis Spawning when All Crises are active.
  • fixOligarchic Overclocking: Reworked Oligarchic Overclocking calculations to correctly cap at +20%.
  • fixAdaptive Shareholder Schemes: Replaced nonfunctional modifier from Adaptive Shareholder Schemes with Job Efficiency.
  • fixExpansion Planner: Fixed expansion planner not updating correctly without manual sorting.

🖥️Stability & Performance(3)

  • fixMultiplayer: Fixed Out-of-Sync (OOS) error on hotjoin related to faction and focus cards.
  • fixMultiplayer: Fixed OOS error triggered by randomized coordinate heights.
  • fixMultiplayer: Reduced likelihood of massive OOS errors at the start of the game.

🛠️Modding(2)

  • newModding: Added new triggers: pop_ethic_amount and pop_ethic_percentage.
  • newModding: Added new effects: pop_force_add_ethic, pop_force_remove_ethic, and pop_force_transfer_ethic.

Summary

Pop System Rework

The core of this update is a fundamental change to how Pops are handled. Pop Groups are no longer subdivided by Ethics or Factions; instead, these are represented as percentages within the group. This change is intended to significantly reduce the number of Pop Groups in the late game, improving performance. This is a save-breaking change, though a rollback branch is available.

Balance & Origins

Synthetic Fertility has been rebalanced to remove starting technologies in exchange for higher scaling potential and a 50% reduction in pop death rates. Several Luminary leader traits, including Pious Ascetic and Enlightened Ruler, have seen significant numerical nerfs. Additionally, Oppressive Autocracy has been adjusted to move Enforcers into the Elite strata.

Planetary Automation & UI

Planetary automation has been moved from the district level to the planet level to streamline management. The UI now features more detailed tooltips for ethics attraction, accessible by holding the Alt key.

← OlderStellaris 4.3 "Cetus" Open Beta Updated (2026-02-26)Feb 27, 2026Newer →Stellaris 4.3 "Cetus" Open Beta Updated (2026-03-06)Mar 6, 2026

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