The Salvation Society, a mysterious organization that has risen in the wasteland in the past decade or so, has an unknown origin and founder. Although it has been established for a short time, it has expanded really fast.
This is due to the Salvation Society's strict control over its members, making it impossible for outsiders to enter, and because of the nature of the organization. Its purpose, as its name suggests, seems to be to save the world.
It is said that the people of the Salvation Society not only save survivors' bases and villages from the Miasma monsters but also generously share many resources. In return, they apparently only ask for some knowledge.
Knowledge is worthless in the wasteland, while resources are the most valuable treasure. Only the Salvation Society would exchange resources for knowledge.