1.6.4528|Jul 22, 2025
View on Steam↗Update 1.6.4528 released
3/5 Moderate
RimWorld Update 1.6.4528 delivers major performance optimizations for the Odyssey expansion, fixes the 'soaking wet' mood debuff while swimming, and resolves numerous gravship and quest-related bugs.
Key Changes
- 1Significant performance optimizations for the world map and texture atlas baking (memory usage).
- 2Removed the 'soaking wet' negative thought when pawns swim for recreation.
- 3Gravcores now have no HP to prevent accidental destruction.
- 4Gravship shield generators now correctly block mortar fire.
- 5Animals specialist now increases fishing speed and yield.
- 6Fixed bluebird eggs hatching into crows.
- 7Added 'remove foundation' option to the floor architect category.
- 8Improved load times for Mac users.
- 9Fixed trader stock getting cleared unexpectedly.
- 10Vultures are now more resistant to rot stink and environmental toxins.
All Changes
🚀Odyssey Expansion(19)
- changeGravcores: Removed HP from gravcores to prevent accidental destruction.
- buffGravship shield generator: Fixed gravship shield generator not blocking mortars.
- changeGravship: Disabled gravship landing on worshipful villages.
- fixWorld map: Prevented opening the world map during gravship cutscenes.
- changeGravtech: Clarified the basic gravtech description.
- changeGravship: Clarified how gravship substructure is removed.
- fixGrav anchor: Fixed pawns left behind with a grav anchor losing their allowed areas.
- nerfGrav engines: Added fallback check to prevent obtaining multiple grav engines from mech signal quest.
- fixGravship: Fixed gravship rotation code not respecting default placing rotation of modded content.
- fixGravship: Fixed collection modified error on gravship launch.
- fixGravcore: Fixed gravcore subquest firing while in flight.
- fixGravship: Fixed terrain blueprints showing up during gravship landing.
- fixGravship: Disabled pawn switching via hotkeys during gravship cutscenes.
- fixGrav anchor: Fixed power grid not updating properly when gravship leaves map with grav anchor.
- fixGravship: Fixed throne room requirement error spam on gravship jump.
- changeGravship scenario: In the new gravship scenario, children now spawn with vacsuits and babies are no longer allowed.
- fixMechanitor: Fixed mechanitor bandwidth not cleared when mechs are left behind on gravship.
- nerfGravship: Prevented workarounds allowing removal of substructure beneath grav buildings.
- fixGrav engines: Fixed potential issue where grav engines were destroyed due to landing under a mountain.
⚖️Gameplay & Balance(17)
- buffPsilocaps: Psilocaps now correctly have a small chance to inspire colonists or induce a catatonic state.
- buffVultures: Vultures are more resistant to rot stink and other environmental toxins.
- nerfPassenger shuttle: Reduced cover effectiveness of passenger shuttle.
- buffAnimals specialist: Animals specialist now increases fishing speed and fishing yield.
- newFungus preferred: 'Fungus preferred' precept is now compatible with the darkness meme.
- buffGlowforest: Reduced caravan movement difficulty and disease occurrence in the glowforest.
- changeHermit crabs: Hermit crabs now hide in their shell when not moving.
- buffPawns: Removed 'soaking wet' negative thought when swimming for recreation.
- fixBluebird eggs: Fixed bluebird eggs hatching into crows.
- buffConduits: Pawns can now repair conduits through blocked corners.
- buffFire: Pawns can now extinguish fires on walls that are only diagonally reachable.
- nerfArchaen tree: Archaen trees can no longer be planted on floors or ice.
- fixVacsuits: Ideo apparel no longer overrides vacsuits in pawn generation.
- buffMechs: Mechs can no longer get grav nausea.
- fixBeam repeater: Beam repeater is now considered ultratech for ideology requirements.
- fixMechs: Dormant charging mechs are now correctly loaded into shuttles.
- fixBirds: Birds now fly out of the map when trapped and starving.
⚙️Performance & Stability(8)
- changeGlowforest: Performance improvements specifically for the glowforest biome.
- changeMac: Improved load times on Mac systems.
- fixPerformance: Reduced memory usage during texture atlas baking, resolving issues with high mod counts.
- fixWorld map: Fixed significant performance drop when the world map or terrain tab is open.
- changePerformance: Improvements to world pawn garbage collection (GC) algorithm.
- fixPerformance: Fixed bad performance in royal title quest when throne room isn't enclosed.
- changePerformance: Added debug checks to strip out heavy profilerblocks and tools for logging world pawn info.
- fixLinux: Fixed invisible textures on Linux.
🐞Bug Fixes(43)
- fixRain: Fixed pixelated appearance of rain.
- fixQuests: Fixed interior courtyard loot rooms generating cutoff.
- fixOdyssey: Fixed typo in Odyssey AncientOrbitalCorridor def name.
- fixAncient garrison corridor: Fixed ancient garrison corridor spawning life support units incorrectly.
- fixQuests: Fixed possible exception in quest info if player silent faction is null.
- fixPathfinding: Fixed rare pathfinding exception with missing factions.
- fixModding: Fixed XML parser error regarding LoadDataFromXmlCustom method.
- fixMechhive assembler: Fixed mechhive assembler last raid tick not saving.
- fixModding: Fixed issue with modded statues due to xenotype being set before kindDef.
- fixFire: Fixed fire on full impassable edifices exposed to vacuum not decaying.
- fixPocket map: Fixed error when trying to enter pocket map with no home map.
- fixShuttle: Fixed shuttle mass not updating when using 'unload all' gizmo.
- fixTraders: Fixed trader stock getting cleared unexpectedly.
- fixMechanitor: Fixed quest breaking when mechanitor transponder is decrypted in pocket map.
- fixAncient mercenaries: Fixed ancient mercenaries spawning outside buildings on cave maps.
- fixMechanoids: Fixed incorrect drop pods used for pursuing mechanoids from scenarios.
- fixQuests: Fixed bugged quest generation with refugee betrayal offer after changing maps.
- fixSteam geysers: Fixed steam geysers spawning too close to insect lair entrances.
- fixUI: Clean room float menu option is now visible in ancient stockpiles.
- fixModding: Fixed modded substructure variants not linking properly.
- fixStatues: Flesh tentacle on statue no longer moves.
- fixCaravans: Prevented hostile minifiable things (hunter traps) from being taken when reforming caravans.
- fixUI: Fixed fuel radius ring breaking when viewing surface from space.
- fixUI: Fixed translation issues in credits.
- fixWatermills: Fixed splashes and watermills not respecting river flow direction.
- fixFishing: Fixed several issues with fish changing and water body logic.
- fixCaravans: Fixed error when camping after merging shuttle caravans.
- fixItems: Fixed outdated descriptions on ancient mining charges and explosives crates.
- fixDrop pods: Fixed ancient and mech drop pod textures not being consistent.
- fixVacsuits: Prevented vacsuits from spawning on planetary pawns.
- fixUI: XML tags are now stripped out of search results.
- nerfFishing: Fixed pawns being able to fish through bridges or substructures.
- fixCerebrex node: Fixed typo in cerebrex node description.
- fixPerformance: Fixed issue with baking atlases smaller than 512x512.
- fixQuests: Fixed possible manhunter quest generation error on polluted ice sheets.
- fixPassenger shuttle: Fixed passenger shuttle skyfallers being the wrong size.
- fixPerformance: Cleaned up cutscene variables causing errors on load.
- fixDebug tools: Fixed dev hack gizmo not firing quest event signals.
- fixMechs: Fixed error while loading mech resurrection bills without a mech.
- fixElectric inhibitor: Fixed minified electric inhibitor producing errors.
- fixScarification ritual: Fixed pawn going catatonic during scarification ritual leading to infinite stacking scars.
- fixQuests: Added back-compat support for infestation quests loading with invalid maps.
- fixModding: Fixed new XML reader not reading the 'Class' attribute on dictionary elements.
🖥️UI/UX(2)
- newArchitect menu: Added 'remove foundation' to the floor architect category.
- changePlayer names: Updated some player names per request.
Summary
Odyssey Expansion & Gravships
This update focuses heavily on stabilizing the recently released Odyssey expansion. Key changes include preventing gravcores from being accidentally destroyed by removing their HP, fixing gravship shield generators to correctly block mortars, and refining the new gravship scenario to ensure children spawn with vacsuits while disabling babies in that specific start.
Performance Improvements
Significant work has been done to improve game stability, particularly for players with large mod lists. Texture atlas baking now uses less memory, and specific performance drops related to the world map and the glowforest biome have been addressed. Mac users should also see improved load times.
Gameplay & Balance
Several balance tweaks have been implemented, such as increasing vulture resistance to toxins and buffing the Animals specialist to improve fishing yield. A notable quality-of-life fix removes the negative 'soaking wet' thought when pawns are swimming for recreation.