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Stellaris
Stellaris
4.3.4|Apr 10, 2026
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4.3.4 Open Beta (part two) is now on stellaris_test [checksum 44ba]

3/5 Moderate

BETADisruptor weapons now reduce enemy regeneration while major fixes address oversized fleets and purge mechanics.

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Key Changes

  • 1Disruptor weapons now reduce enemy Shield, Armor, and Hull regeneration on hit
  • 2Fixed bug causing GDF, Revolt, and Machine Uprising fleets to be 5x larger than intended
  • 3Faculty of Archaeostudies buffed with higher artifact production and storage
  • 4Purges now pause during ground battles to prevent unintended pop loss
  • 5Astral Siphon thread production and storage increased, while Physics bonus was reduced
  • 6Scourge Missiles damage corrected after previously dealing 5x intended damage
  • 7Oppressive Autocracies granted the ability to build Medical Centers
  • 8Added a 10-year maximum cap for fleets staying Missing In Action (MIA)
  • 9AI budgets updated to better manage Starbase costs and fleet rebuilding
  • 10Multiple Out-of-Sync (OOS) fixes for multiplayer stability

All Changes

⚔️Weapons(6)

  • buffDisruptors: T1 Disruptors now reduce Shield regeneration by 20% and Armor/Hull regeneration by 10% for 10 days on hit
  • buffDisruptors: T2 Disruptors now reduce Shield regeneration by 35% and Armor/Hull regeneration by 20% for 10 days on hit
  • buffDisruptors: T3 Disruptors now reduce Shield regeneration by 50% and Armor/Hull regeneration by 30% for 10 days on hit
  • buffPsionic Disruptors: Psionic Disruptors now reduce Shield regeneration by 35% and Fire Rate by 20% (stacks with other disruptors)
  • fixScourge Missiles: Fixed Scourge Missiles dealing 5x intended damage
  • buffIon Cannon: Increased Ion Cannon collateral damage from 20 to 100

🏗️Economy & Buildings(10)

  • buffAdvanced Bio-Reactor: Increased Advanced Bio-Reactor Exotic Gas production from 0.05 to 0.1
  • buffMinistry of Production: Increased Ministry of Production and Production Center Alloy and Consumer Goods bonus from 0.1 to 0.2
  • buffFaculty of Archaeostudies: Biologists on Relic Worlds now produce +0.25 Minor Artifacts (up from +0.1)
  • buffArchaeo-Engineering: Archaeo-Engineering AP now increases Biologist Minor Artifact Production by +0.15 (up from +0.05)
  • buffMinor Artifacts: Increased Minor Artifact storage cap to 2000 (was 1000) and Archaeo-Engineering bonus to 3000 (was 2000)
  • buffFaculty of Archaeostudies: Reduced Faculty of Archaeostudies building upkeep from 10 to 8 Energy
  • buffAstral Siphon: Increased Astral Siphon thread production to +0.2, +0.35, and +0.50
  • nerfAstral Siphon: Reduced Astral Siphon Physics bonus to +0.2, +0.35, and +0.50 (was +0.25/+0.5/+0.75)
  • buffAstral Siphon: Reduced Astral Siphon upkeep for standard and Gestalt empires
  • buffAstral Siphon: Increased thread storage to +200, +400, +600 (was +100, +200, +300)

⚙️Gameplay Systems(5)

  • changeFleets: Added a 10-year cap for how long a fleet can go MIA (Missing In Action)
  • changePurges: All purges now pause whenever a ground battle is occurring on the planet
  • newOppressive Autocracies: Oppressive Autocracies can now build medical centers
  • buffStorm Chasers: Storm Chasers now have an increased chance to draw Storm techs
  • nerfVoidworms: Reduced Voidworm fleet power to more accurately reflect their capabilities

🐞Bug Fixes(6)

  • fixFleets: Fixed fleet creation effects spawning fleets 5x larger than intended; affects GDF, Revolts, and Machine Uprisings
  • buffDoom of the Eater: Increased Doom of the Eater fleet size to compensate for fleet scaling fixes
  • fixMutagenic Habitability: Fixed Mutagenic Habitability being capped lower than stated
  • fixVolcanic Forge: Fixed Volcanic Forge technology not appearing for certain origins
  • fixNecrophage: Fixed Necrophage and Planet Forgers pre-FTL worlds incorrectly becoming volcanic at start
  • fixLeaders: Fixed math error causing Level 1 leader costs to be too high in the beta branch

🤖AI Behavior(3)

  • changeAI: Updated AI alloy and food budgets to handle new Starbase costs
  • changeAI: Adjusted AI food budget to ensure bio-ship empires rebuild fleets after war
  • changeAI: Adjusted AI influence budgets to prevent immediate depletion on vassalization contract changes

🖥️Performance & Stability(4)

  • fixMultiplayer: Fixed Out-of-Sync (OOS) error when a hotjoiner is accepted during the hotjoin process
  • fixMultiplayer: Fixed OOS error when a player leaves and rejoins a session
  • fixSpy Networks: Fixed OOS error related to Spy Networks
  • fixMultiplayer: Fixed OOS error at start when players have DLC mismatches and choose random empires

Summary

Overview

This second update to the 4.3.4 'Cetus' Open Beta focuses on significant balance adjustments for weapons and economic buildings, alongside critical bug fixes for fleet scaling and planetary purges.

Combat & Balance

Disruptors have received a major rework, now applying a 10-day regeneration penalty to shields, armor, and hull on hit. Additionally, the 'Faculty of Archaeostudies' and 'Astral Siphons' have been buffed to improve resource production and storage.

Bug Fixes & AI

A critical error causing certain fleets (like GDF and Revolts) to spawn at five times their intended size has been resolved. AI logic has also been tuned to better manage alloy and food budgets in response to recent starbase cost changes.

← OlderStellaris Dev Diary #415 - The Gamma MenaceApr 9, 2026

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