Each nation possesses a huge secret weapon, and it must be defeated to get an Achievement. In order for it to appear, the Nation must control less than 10 Battlefields, and have lost the battlefield and area where the weapon appears- then it must take it back and control the UW's battlefield when the area is retaken. The mission appears for about an hour once the conditions are met. Completing the mission grants an Achievement and 3000 Valor EXP for all RTs.