Knuckle Bunker (ナックルバンカー Nakkuru Bankā) is an attack spell of Ginga Nakajima. By boosting mana at Revolver Knuckle, Ginga generates a hard field around her entire knuckle and gives blasts with such field. When it is used as a counterattack against close attacks, it can block blades and gives damage to the opponent's weapon or attacking part.