The first contact with terraformers occurred back in the year three thousand. At that time, no one could imagine that after some fifty years the Earth would change beyond recognition. And people will be forced to hide behind the high walls of four citadels. The wall is the only thing that saves people from inevitable death. But to defend forever means to lose, so we decided to gradually go on the offensive. Only in this case was there hope for returning the Earth to human control. And the first step towards this plan was the creation of the Phoenix units. All information about them was strictly classified, which gave rise to many of the most fantastic rumors about the fighters of these units. Some eyewitnesses said that they saw with their own eyes how the phoenix died, but after a while they saw it alive and well on another part of the wall. Although most people believed that phoenix fighters were immortal, in reality this was not the case.