During the era of the Clone Wars, as detailed in historical records, a scientist specializing in genetics engineered a highly lethal virus that proved fatal to the Caarite race. This was done at the request of the Believers, a Sith religious group. In an act of vanity, the researcher incorporated a unique identifier into the virus's sub-atomic structure—a distinctive squiggle that served as their personal mark. This marker was designed to be undetectable by anyone other than the scientist themselves. The researcher possessed the ability to alter the virus's characteristics, requiring only a few weeks to complete such modifications.