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Paradox Development Studio · Paradox Interactive·$49.99
Dec 19, 2025 · 5mo ago

Stellaris 4.3 "Cetus" Open Beta Updated (2025-12-18)

AI summary2w

The 4.3 'Cetus' Open Beta introduces a comprehensive rework of the Refugee system with a new 'Refugee Attraction' modifier, significant naval capacity and ship balance overhauls, and systemic changes to Empire Size and job efficiency.

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Buffs9

  • RefugeesRefactored refugee calculations; pops are now more likely to flee to empires where their species is dominant and pick planets more intelligently.
  • Perdition BeamsPerdition Beams now deal damage to enemy ships within a certain range of the target.0Added
  • Machine Intelligence RulerAdded a significant amenity bonus per colony per ruler level.0500 Amenities
  • Naval CapacityIncreased base naval capacity to 40.2040 units
  • Empire SizeThe base amount of Empire Size generated by pops has been halved.100%50% %
  • Frigates
    • Frigates now move at Destroyer speed instead of Cruiser speed.CruiserDestroyer
    • Added +1 Utility and Aux slot to Frigates.Standard+1 Utility/Aux slots
  • Survivor TraitThe Survivor species trait now grants a reduction to housing and amenities usage.StandardReduced
  • Colonial SpiritThe Colonial Spirit modifier now grants 10% pop growth.0%10% %

Nerfs5

  • Ion CannonsIon Cannons now deal less collateral damage at a shorter range compared to Titan Perdition Beams.HighLow
  • Machine Intelligence RulerReduced the empire size reduction provided by the Machine Intelligence Ruler.-3%-1% %
  • Cosmogenesis
    • Slower progression for Cosmogenesis crisis currency gains.FastSlower
    • Fallen Empires now directly oppose experiments, leading to Total War at stage 5.StandardHarder
  • Empire SizeThe base amount of Empire Size generated by colonies has been increased to 20.Low20 units

Other changes2

  • RefugeesIntroduced Refugee Attraction modifier based on ethics, civics, and origins to determine how likely pops are to flee to an empire.Added %
  • Naval CapacityMost ships now use 5x more naval capacity than previously.1x5x multiplier

subjects affected (10)

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Stellaris · Dec 19, 2025
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Patch history

see all 5

  1. Stellaris Patch 4.2.4 released (checksum 7a03)
    Dec 11, 2025 · 5mo
    +5
  2. Stellaris 4.2.3 patch released (checksum f58a)
    Dec 4, 2025 · 5mo
    +118
  3. 4.2.2 Hotfix now available
    Nov 27, 2025 · 5mo
  4. 4.1.7 Patch Released (checksum 6486)
    Nov 3, 2025 · 6mo
    +52

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