The IG virus is a devastating weapon that has the unique ability to zombify infected individuals, even reanimating seemingly deceased tissue. The origin of the virus can be traced back to nation of Fascist White States, which has since been destroyed in several wars and incidents. Quickly making its way onto the international weapon market, the virus was sold off to several nations and continued to proliferate. After several noted outbreaks, nations noted the destructive power possessed by the weapon; many nations decided to either cease production or actively seek to rid the world of the weapon.