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Stellaris
Stellaris
4.3|Feb 19, 2026
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Stellaris 4.3 "Cetus" Open Beta Updated (2026-02-19)

4/5 Significant

Multiple End Game Crises can now overlap with a 25-year delay, alongside a major rework of the Aptitude Tradition and Mutagenic Spas civic.

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Key Changes

  • 1Multiple End Game Crises can now spawn 25 years apart, even if one is active
  • 2Complete rework of the Aptitude Tradition tree focusing on leader capacity and efficiency
  • 3Mutagenic Spas redesigned to provide ruler efficiency and leader levels at a habitability cost
  • 4Tankbound origin buffed by removing the 30% automated workforce penalty
  • 5Slave Market costs shifted from Energy to Trade value
  • 6Capital Productivity technology efficiency halved from 10% to 5% per tier
  • 7Unbidden initial fleets buffed to increase their survival rate
  • 8Mercenary and Shroudwalker Enclaves now require 100 Naval Capacity
  • 9Naval Capacity repeatable technology cap increased to 20
  • 10Fixed a major crash in the planet view economy tab

All Changes

🌌Crisis(5)

  • changeEnd Game Crisis: End Game Crises can now spawn 25 years after a previous crisis, even if the current one is still active.
  • changeEnd Game Crisis: Adjusted End Game Crisis power levels relative to the difficulty setting.
  • changeEnd Game Crisis: Tuned crisis strength scaling when the 'All' end game crisis setting is enabled.
  • nerfCetana: Reduced the probability of Cetana spawning while another crisis is currently active.
  • buffThe Unbidden: Increased the strength of the initial Unbidden fleet to improve their early survival.

📜Traditions(8)

  • buffAptitude Tradition: Leadership Conditioning agenda now grants 5% Leader XP on start and 20% on completion (changed from 10%/10%).
  • changeAptitude Tradition: The Empire Needs You now provides -25% Leader Cost and +1 Recruitable Leaders per Class.
  • changeAptitude Tradition: Psychological Profiling now provides -1 Leader Maximum Negative Traits and +1 Leader Capacity for each class.
  • changeAptitude Tradition: Healthcare Program now provides +10% Leader Lifespan and -25% Leader Upkeep.
  • changeAptitude Tradition: Specialist Training now provides +10% Specialist (or Complex Drone) Job Efficiency.
  • changeAptitude Tradition: Champions of the Empire now provides +1 Effective Leader Skill Level.
  • changeAptitude Tradition: Aptitude Finisher changed to +1 Leader Starting Traits (moved from Champions of the Empire).
  • buffAppropriation Tradition: Appropriation tradition now grants +25% Auto Resettlement Chance.

🏛️Civics & Ethics(7)

  • nerfMutagenic Spas: Mutagenic Spas no longer scale with district count and no longer provide pop growth or assembly.
  • changeMutagenic Spas: Mutagenic Spas civic now forces all leaders (except gestalt nodes) to start with the Substance Abuser trait.
  • changeMutagenic Spas: Mutagenic Spas building now provides -10% Habitability Ceiling and Floor, 200 jobs, and +3 effective leader level for governors with Substance Abuser.
  • buffMutagenic Spas: Mutagenic Spas jobs now increase ruler strata job efficiency and provide amenities.
  • newRogue Servitors: Rogue Servitors now have a unique Mutagenic Spas variant for Bio-Trophies.
  • changeDistinguished Admiralty: Distinguished Admiralty now grants +20% Command Limit instead of a flat numerical increase.
  • nerfEgalitarian: Reduced the Egalitarian faction production bonus to +15% / +30%.

🛸Factions & Origins(8)

  • buffTankbound: Infernal Tankbounds now start with three additional Generator districts.
  • buffTankbound: Non-infernal Tankbound empires now convert one less Farm into a Generator at start.
  • buffTankbound: Removed the 30% automated workforce penalty for Tankbound empires.
  • changeTankbound: Tankbound no longer start with Assembly Patterns insights.
  • buffTankbound: Assembly Patterns and Construction Templates now grant Tankbound +10% Automation Efficiency.
  • buffCybernetic Creeds: Cybernetic Creeds can now adopt Egalitarian ethics.
  • buffCybernetic Creeds: Cybernetic Creed Spiritualist Factions no longer have negative opinions regarding robots.
  • buffMindwardens: Rejecting Psionic Heresy grants Mindwardens access to the Shroud Inoculation living standard.

🔬Technology & Economy(6)

  • nerfCapital Productivity: Capital Productivity techs reduced from +10% efficiency per tier to +5% per tier.
  • changeSlave Market: Slaves in the Slave Market now cost Trade value instead of Energy.
  • buffNaval Capacity: Increased the maximum cap for Naval Capacity repeatable technology to 20.
  • nerfEnclaves: Mercenary and Shroudwalker Enclaves now require a minimum of 100 Naval Capacity in the fleet.
  • nerfTitans: Reduced the Command Limit increase from Titans to align with their actual size.
  • changeCrisis Beacon: Crisis Beacon espionage operation now targets larger fleets than previously required.

🐛Bug Fixes(7)

  • fixRelay Network: Fixed Specialist Subject Relay Network effects incorrectly stacking multiple times.
  • fixBio Shields: Fixed Bio Shield techs not inheriting Army Health modifiers from regular shield techs.
  • fixTankbound: Fixed Tankbound receiving unintended extra Production Overseers from volcanic districts.
  • fixVoid Dwellers: Fixed Lithoid and Infernal Void Dwellers attempting to build mining stations on starting habitats.
  • fixAugmentors: Augmentor research output is now correctly split into society and engineering before cybernetic ascension.
  • fixMercenary Enclaves: Fixed calculation errors for Mercenary Enclaves.
  • fixPrimal Calling: Fixed Primal Calling starting with the incorrect version of their unique building.

🖥️Performance & UI(5)

  • changeUI: Optimized resource lists within the Planet UI for better performance.
  • changePerformance: Moved planet event executions and trigger executions to the daily pulse to prevent Out-of-Sync errors.
  • fixPerformance: Fixed a crash occurring in the planet view economy tab when expanding jobs.
  • fixUI: Fixed tooltips for Automated Job upkeep, Refinery Worlds, and the Bloomed species trait.
  • fixUI: Fixed ship designer component selection issues when using custom roles.

Summary

Crisis & End Game Changes

The 'Cetus' update fundamentally changes the End Game Crisis flow, allowing multiple crises to spawn just 25 years apart regardless of whether the previous one is active. The Unbidden have received early-game buffs to improve survival, while Cetana's spawn logic has been adjusted to prevent excessive overlap.

Tradition & Civic Reworks

The Aptitude Tradition tree has been overhauled, shifting bonuses toward leader capacity and job efficiency. Mutagenic Spas have been redesigned to focus on leader levels and ruler efficiency at the cost of habitability, removing previous district-scaling exploits. Additionally, the Tankbound origin received significant buffs, including the removal of its automated workforce penalty.

← OlderStellaris 4.3 "Cetus" Open Beta Updated (2026-02-12)Feb 12, 2026Newer →Stellaris Dev Diary #411 - Our Next 4.3 ExperimentFeb 26, 2026

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