RimWorld 1.4.3901 improves stability, balance, and AI behavior while refining quality-of-life systems introduced in earlier 1.4 patches and DLC expansions. The patch addresses bugs that affected colony management, combat pathing, mod compatibility, and performance, and includes small but meaningful content and tuning across all DLCs.
: Released in April 2024, this horror-themed DLC introduces cosmic horrors, containment facilities for studying dark entities, and reality-bending threats. rimworld 143901 all dlcs new