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Stellaris
Stellaris
4.5.2|Oct 6, 2026
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Stellaris 4.5.2 released [checksum 9776]

3/5 Moderate

Armor upkeep costs have been halved to match shields, while Nomadic Knights of the Toxic God gain the ability to detoxify worlds using Arkships.

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Key Changes

  • 1Armor energy and alloy upkeep reduced by 50% to match shield costs
  • 2Nomadic Knights of the Toxic God can now detoxify worlds using Arkships
  • 3Revolting colonies now join their backing empire instead of becoming independent
  • 4Reduced late-game micro freezes associated with Nomad AIs
  • 5Split defense platform and starbase weapon/defense policies into separate categories
  • 6Fixed infinite combat loops caused by ships drifting out of range
  • 7Experiment Engineers and Telepaths received significant output and upkeep rebalancing
  • 8Franchising Civic now bypasses diplomatic requirements for Subjugation
  • 9Cyborg leaders with Ritualistic Implants now provide unique council and ruler bonuses
  • 10Fixed Fallen Empires repeatedly declaring war on the Synth Queen

All Changes

🌌Factions & Origins(8)

  • newKnights of the Toxic God: Nomadic Knights of the Toxic God can now use Arkships to Detoxify Toxic Terraforming Candidates after taming or slaying the Toxic God
  • fixKnights of the Toxic God: Nomadic Knights of the Toxic God can now settle upon reaching the Toxic God system, retaining the Order's Keep and Knights
  • fixKnights of the Toxic God: Nomadic Knights of the Toxic God no longer get stuck if the Order's Keep Arkship is lost; the quest now locks or ends appropriately
  • buffFranchising: Franchising Civic now ignores Opinion, Trust, and Embassy requirements for proposing Subjugation
  • changeCyborg: Cyborg leaders with Ritualistic Implants now spread the creed, providing bonuses to Council Agendas, Spiritualist Ethics, or Unity based on their role
  • changeFire Cult: Fire Cult now grants Job Efficiency to Fire Dancers instead of Unity output, scaling with Pop Group Habitability
  • fixProsperous Unification: Prosperous Unification now correctly grants additional districts for Nomadic empires
  • fixVoid Dwellers: Void Dwellers no longer ignore thermophile district initialization

⚙️Gameplay Systems(7)

  • changePolicies: Split defense platforms into their own weapon/defense preference policies and removed the redundant starbase strike craft policy
  • newNomadic Empires: Added Weapon Preferences (Arkships) and Defense Preferences (Waystations) policies for nomadic empires
  • changePolicies: Starting Fleet Doctrine, Weapon Preferences, and Defense Preferences policies are now randomized and weighted towards empire defaults
  • changePlanetary Revolt: Colonies that revolt with external backing now join the backing empire instead of becoming independent
  • buffPlanetary Revolt: Rebels who break away now also claim nearby empty systems
  • fixPre-FTL: Pre-FTL civilizations under observation outposts shift ethics towards the observing empire again
  • buffCovenants: Covenant telepath bonuses now apply immediately upon formation rather than after one year

⚖️Balance(8)

  • buffArmor: Armor energy and alloy upkeep reduced to match shields of the same tier (previously double)
  • changeOperational Reserves: Conserve approach for Operational Reserves now gives -50% Specialist Job Efficiency instead of -50% output for Bureaucrats and Researchers
  • changePilot Project: Pilot Project bonuses now only apply to Cyborg Pops and provide +15% to Elites, +7.5% to Specialists, +10% to Workers, and +5% to all
  • nerfExperiment Engineers: Experiment Engineers research production reduced from 2 to 1 of each type; upkeep halved and Job Efficiency now scales with Crime
  • nerfTelepaths: Telepaths under the Whisperers in the Void Covenant now give 1 research per rank, down from 1.5
  • nerfCrystallinus Diffuser: Crystallinus Diffuser now grants +50% Job Efficiency instead of +100% Resources from Jobs and only boosts non-robotic pops
  • nerfMaulers: Maulers movement speed slightly reduced
  • changeCradle of Souls: Gestalt empires with Cradle of Souls Covenant now receive Unity from Psionic Pops instead of a percentage bonus to Telepath Unity

🐛Bug Fixes(10)

  • fixCombat: Fixed fleets staying locked in battle forever when ships drifted out of weapon range
  • fixStarbases: Fixed starbase weapon preference policies not taking priority when other weapons scored higher
  • fixFallen Empires: Fixed Fallen Empires repeatedly declaring the same war on the Synth Queen
  • fixReanimator: Reanimator AI Empires can build Undead Armies again
  • fixArkships: Fixed ship components for Arkships not adding to their upkeep
  • fixArchaeo-Engineers: Fixed Archaeo-Engineers mutations (Ancient Suspension Epidermis/Energized Carapace) adding flat shield bonuses instead of multipliers
  • fixWar: Fixed subjects staying in wars they should have left when changing overlords or declaring independence
  • fixExperimental Testing: Fixed high Councilor levels inverting Test Subject losses in Experimental Testing, which incorrectly added Pops
  • fixUI: Fixed various tooltip issues for Fire Cult, Cybernetic Creed, Psionic Authority, and Knights of the Toxic God
  • fixDemocratic Transference: Fixed Democratic Transference only increasing energy upkeep of districts instead of all upkeep

🛡️Performance & Stability(4)

  • fixPerformance: Reduced micro freezes in the late game specifically involving Nomad AIs
  • fixStability: Fixed a crash occurring when loading saves with unrecognized asteroid belt types
  • fixStability: Fixed a startup crash caused by missing or empty language lists
  • fixStability: Fixed game crash when executing spawn_natural_wormhole on non-existent objects

🖥️UI/UX(4)

  • changeUI: Renamed weapon and defense policies to include their target (Fleets, Starbases, etc.) in parentheses for better grouping
  • changeUI: Military Policies window is now taller and wider to prevent text clipping
  • changeUI: Military and Research Policies are now sorted alphabetically
  • fixUI: The Shroud tab no longer opens automatically after breaching the Shroud

Summary

Stellaris 4.5.2 'Cygnus' is a comprehensive hotfix addressing balance, stability, and gameplay systems. The update significantly buffs ship economy by reducing armor upkeep and introduces new utility for Nomadic empires, specifically allowing Knights of the Toxic God to terraform toxic worlds. It also refines the policy system by splitting defense platform and starbase preferences, while resolving numerous bugs related to planetary revolts, origins, and late-game performance.

← OlderStellaris Dev Diary #434 - 4.5.2 'Cygnus' Tentative Patch NotesOct 1, 2026

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