[Name] X-2 Virus [Source] BattleTanx, BattleTanx: Global Assault [Symptoms] 
An extremely deadly virus released in 2001 and further researched in 2006 that killed 99.9% of the world's human female population that did not possess a special psychic ability known as 'The Edge'. Those that were spared were treated with the utmost respect, authority, and loyalty, thereby earning their title of 'Queenlord'.