Dueling Blade is a term used to describe a type of fencing weapon, specifically an epee. An epee is a thrusting weapon with a triangular cross-section and a large bell guard. It is the heaviest of the three weapons used in fencing, and is the only one that allows for simultaneous attack and defense. The epee is the modern version of the dueling sword, which was used in duels during the 18th and 19th centuries.