The centers of many cities on the planet are the scene of deadly confrontations between populations and assimilated, in a world very similar to ours at the beginning of the attacks. The city of Paris will gradually become a large quarantine area where the only livings are survivors, assimilated and military forces. The enemies of Project TERMINUS come from a combination of robotics and biology. They have been contaminated by swarms composed of billions of nanites that will take control of their host by replacing the functions exercised by the brain of the individual, which kills him. These swarms are a constant threat in the quarantine areas seeking to infect as many living as possible. The origin of these nanites is unknown even though several theories are advanced by many people.