Defiance is a science fiction-themed persistent world massively multiplayer online third-person shooter . Defiance takes place on a terraformed Earth several years into the future. Characters come from one of four Origins: Veterans, Outlaws, Machinists, or Survivalists. Veterans are a group of soldiers who survived The Pale Wars, a massive conflict between humans and aliens. Outlaws are criminals who raid and destroy for fortunes. Machinists are scavengers, who recover alien technology to make profits and a living from it. Survivalists are humans or aliens who attempt to survive in the newly formed, hostile world.