The wasteland king used to be one of the duke's lieutenants, know for his sadistic methods and violent nature he gained a small following among the dukes crew and later challenged his authority to end up scaping with a small group of people to settle his own base and take over part of the territory making life miserable for survivors and traders and constantly fighting the duke for power.
( at least in my head that is the background story of the image ) lol
And if well this aint really a full display of how it went, here are some screenshots i took along the way as it developed.