The term 'Duel Blade' refers to a type of fencing weapon that consists of two blades, one of which is an epee. An epee is a type of fencing sword that is heavier and more rigid than other types of fencing swords. It is also the only type of fencing sword that allows for thrusting attacks. The Duel Blade is used in fencing competitions and is designed to provide a balanced combination of offense and defense.