FNV-23

FNV-23, alternatively called the Gray Death, originated as a virus engineered by the Imperial forces, with initial trials conducted on the planet of Sedesia. This virus, a product of the Pathogen-Based Loyalty Enhancement Program and the work of Doctor Fesjo Negleem, possessed a unique characteristic: its antigen requirements were in constant flux. This rendered individuals incapable of developing immunity and made finding a cure exceedingly difficult.