RimWorld Build 1.4.3901: The Ultimate Colony Survival Experience with All DLCs

On 143901 , the Empire’s psychic sensitivity has been rebalanced against the new Anomaly entities. Your noble with a Zeus hammer now feels genuinely useful when a "Metalhorror" reveals itself. The psychic silences from Anomaly actually interact with the Royalty title system—expect your Count to throw a tantrum if their psychic harmonizer is jammed.

The base game now includes vital quality-of-life improvements that were previously only available through mods. Integrated "Replace Stuff":

Here is a deep dive into what this specific version offers when the full package is unlocked.