corresponds to the late-stage version of Update 1.4.3701 . This was released during the "Refactoring" patch cycle, which took place shortly after the explosive launch of the Biotech DLC and before the massive shift toward Update 1.5.
Your "Town Mayor" isn't just holding a generic Charge Rifle anymore. He is holding "The Judge," a rifle that was Masterwork, but you infused with a Psychic Soothestone. Now, every time he shoots a raider, it emits a psychic pulse that calms the mental breaks of nearby allies. The weapon now has a story you wrote through the mechanics. rimworld 143901 all dlcs full
Version 1.4.3901 refined several core mechanics that made managing "full" DLC colonies significantly smoother: Painting & Customization corresponds to the late-stage version of Update 1