: The introduction of toxic waste packs and the environmental hazards they create.
: Core Biotech features that allowed players to engineer custom xenohumans and manage colony families. RimWorld v1.4.3517
For players still running this specific version, it's generally recommended to update to the latest stable release (currently in the 1.5+ range) to benefit from even more significant performance overhauls and new content. Vanilla Apparel Expanded - Steam Workshop : The introduction of toxic waste packs and