The Rest in Peace Cult; more commonly known as Rippers are a group of uninfected human enemies that worship both the Freakers and the outbreak itself, believing that to become Infected is a gift that all should strive towards becoming. They also believe that civilization and any vestiges of it are blasphemous, and thus typically torture and kill other humans they come across. 
Members are typically bald, adorning the acronym 'RIP' on their bodies, and will ritualistically mutilate their own bodies with scars and burns. Their tendency to mutilate does not only apply to themselves but also anybody who is unfortunate enough to find themselves in their territory, which is usually marked by signs known as sigils.
Rippers will appear in Days Gone, but first appeared in an hour-long Pre-Beta video shared with Game Informer.