represents a refined state of the game’s third major expansion era, providing deep integration between the base game and its three core DLCs:
. This build focuses on cross-expansion synergy, ensuring that features like genetic modification from interact seamlessly with the belief systems of Core DLC Integration & Version Features Expansion Synergy
: Build 1.4 introduced specific "cross-expansion" content, such as new precepts that respond to features like bloodfeeding and mechanoid labor. Genetic Persistence
: Improvements in version 1.4.3901 ensure that "xenotypes breed true," meaning gene-modded humans reliably pass down their specific genetic traits to offspring. Refined UX
: This version includes significant UI overhauls, such as a dedicated mod manager, functional shelving for triple-stacking items, and a "heat overlay" to manage room temperatures effectively. in 1.4.3901
With all DLCs active, your RimWorld experience is divided into three distinct pillars of play: Royalty (DLC)
The request "paper: Rimworld 1.4.3901 All DLCs" refers to a specific patch version of the colony simulator , which was current during the expansion cycle. Version Context (1.4.3901) RimWorld version
was a minor update within the 1.4 "Biotech" branch. Released in late 2022, it primarily focused on bug fixes and performance improvements following the massive 1.4 content update. Included DLCs for this Version
As of version 1.4.3901, "All DLCs" refers to the first three major expansions. Later expansions like (released in 2024 and 2025 respectively) are not compatible with the 1.4 branch. RimWorld Wiki
: Adds a psychic-powered nobility system, high-tech weaponry, and the "Empire" faction.
: Introduces belief systems (Ideoligions) that dictate how your colonists behave, what they eat, and their social structures.
: The flagship DLC for version 1.4, adding children/reproduction, genetic modification (Xenohumans), and controllable mechanoids. RimWorld Wiki Managing Mods and DLCs
If you are looking for a stable mod list for this specific version, the Better RimWorld 1.4 Steam Collection includes essential libraries like configured for the 1.4 game state. essential quality-of-life mods that are confirmed to work with version 1.4.3901? Biotech (DLC) - RimWorld Wiki
Released on November 3, 2023, RimWorld version 1.4.3901 focused on technical stability, cross-expansion integration, and critical bug fixes, particularly addressing a Biotech DLC Steam ID issue. The update solidified features from the 1.4 lifecycle, including improved storage, painting, and new turret mechanics. For full details on this version, visit the RimWorld Wiki RimWorld Wiki Version/1.4.3901 - RimWorld Wiki
(released November 3, 2023) is a stable update within the 1.4 "Biotech" era. This specific build focuses on technical stability and integration between the core game and its major expansions. As of this version, the "All DLCs" package includes . Note that the Rimworld 1.4.3901 All DLCs
DLC was released later (April 2024) and is typically associated with version 1.5. Core Version 1.4.3901 Highlights
This update primarily addressed back-end issues to ensure a smooth experience with the expansion: Biotech Integration
: Fixed a critical issue where the Steam App ID for Biotech was missing or incorrectly parsed, which previously prevented some players from accessing DLC content. Data Maintenance
: Updated translation data and player-created content (like names and backstories) to maintain consistency across different languages and community contributions. RimWorld Wiki DLC Content Overview (1.4 Era)
With all DLCs enabled in version 1.4.3901, the gameplay experience is defined by three major pillars:
: Adds human reproduction, child-rearing, and genetic engineering. Players can create "Xenohumans" with custom traits and manage a "Mechanator"—a colonist who controls a swarm of friendly mechanoids.
: Introduces customizable belief systems. Your colony can follow specific "memes" (e.g., Cannibalism, Transhumanism, or Nudism), which unlock unique rituals, social roles, and buildings.
: Adds the "Fallen Empire" faction. Colonists can earn royal titles to gain psychic powers (Psycasts) and call in Imperial military aid, though they may become increasingly demanding as their rank rises. Quality of Life Features in 1.4
The 1.4 update introduced several base-game improvements available in this version: Auto-slaughter
: A dedicated UI to manage animal populations automatically based on your desired headcount. Tile Inspector
: Pressing 'Alt' now displays detailed information about the tile under your cursor, such as beauty and light levels. Improved UI
: Includes a search bar for the custom scenario editor and better formatting for research projects. RimWorld 1.4 Patch Notes - IGN
RimWorld 1.4.3901: The Ultimate Colony Simulation Experience RimWorld version 1.4.3901
represents a highly stable and content-rich era of the sci-fi colony sim. Whether you are managing a group of crash-landed survivors or a burgeoning empire, this version integrates years of refinements with the game's expansive DLC lineup to create a deep, emergent storytelling experience. Core Enhancements in 1.4 represents a refined state of the game’s third
The 1.4 update brought significant technical and gameplay improvements to the base game, including:
Performance Optimization: Significant upgrades to the rendering engine and pawn logic, allowing for smoother gameplay with larger colonies.
Painting & Customization: The ability to paint walls, floors, and furniture, giving players much more creative control over their base aesthetics.
Gene Modding & Children: While expanded by DLCs, the base systems for growth and biological complexity were refined in this version.
New Starting Scenarios: Fresh ways to begin your journey, including the "Mechanitor" start for those who want to command a robot army. The Complete DLC Experience
To get the most out of RimWorld 1.4.3901, the three major expansions add distinct layers of complexity: 1. Royalty
Focuses on the arrival of the shattered Empire. It introduces:
Noble Titles: Pawns can earn titles like Knight or Baron, gaining access to powerful "psylink" abilities.
Psychic Powers: Use the mind to teleport enemies, inspire allies, or ignite fires.
Imperial Quests: High-stakes missions involving grand ceremonies and advanced tech rewards. 2. Ideology
Turns your colony into a belief-driven society. It allows you to:
Create Religions: Design a custom "Ideoligion" that dictates what your pawns find moral or offensive (e.g., cannibalism, technophilia, or tree-worship).
Specialist Roles: Assign pawns as Moral Guides or Production Specialists to gain massive efficiency buffs.
Rituals & Relics: Host dance parties, gladiator duels, or sacrificial rites to boost colony mood. 3. Biotech References
The largest expansion to date, focusing on biology and robotics:
Mechanoids: Become a "Mechanitor" to build and control your own labor and combat robots.
Genetics: Extract and combine "Xenogerms" to create super-soldiers, immortal vampires (Sanguophages), or fire-breathing workers.
Children & Reproduction: Pawns can now have children, allowing you to raise the next generation of colonists from birth, shaping their traits and skills. Why Version 1.4.3901?
This specific sub-version is often cited in the community for its mod compatibility. Most major mods (like the Vanilla Expanded series) are fully optimized for the 1.4 cycle. It provides a "sweet spot" of content before the more radical changes introduced in later updates like 1.5 and the Anomaly DLC.
Day 78. A Sightstealer stalks the colony at night — invisible, clawing eyes out. It takes Tuck’s right eye before Vek decapitates it. Tuck now wears a crude eyepatch. He still grows corn by feel.
But the real horror emerges. Lyssa collapses during dinner. Her abdomen bulges. The metal horror bursts forth — a writhing, chitinous mimic of a human spine with too many joints. It shrieks and scuttles into the vent system.
The colony is no longer a settlement. It is a host.
Jin-ho, half-mad from psychic drain, orders a void provocation. He touches the monolith again. A flesh pit opens in the rec room. A Noctol crawls out — blind, weeping black fluid, but its touch melts plasteel.
Vek fights it barehanded after his monosword melts. He kills it. He loses three fingers. He smiles for the first time.
Yes, but with a warning. Running RimWorld 1.4.3901 All DLCs creates a complex system. Here is the synergy:
The total gameplay time to complete all DLC endings (Royalty Ascent, Archonexus, and Mechanitor Ship) in one playthrough is roughly 150+ hours.
To truly play RimWorld 1.4.3901 All DLCs, you need three major expansions. Here is what each adds to this specific patch version.
RimWorld’s longevity is due to its modding community. However, nothing breaks a modded save like a game update. 1.4.3901 is considered a "stabilization patch."
Most major mods (Vanilla Expanded Series, Save Our Ship 2, Combat Extended) have now been updated to explicitly target 1.4.3901.
Verse.AI.Toils_Reserve conflicting with DLC-specific job drivers.If you are downloading a pre-configured modpack or a repack (for personal offline use), ensuring the version string reads 1.4.3901 guarantees you miss the buggy .3890 patch and don't jump to the experimental 1.5 branch.