Excalibur

is a bladeless sword and the personal weapon of Arthur Boyle. If wielded by a Third Generation, the user can mold a concentrated blade of plasma, a state of matter, created by heating up flames to extreme temperatures on the hilt, giving it a plasma blade in the process. Such process requires the wielder to use their Ignition Ability. As noted by Takehisa Hinawa, the swordplay using Excalibur is equivalent to plasma cutting.

Trivia

 * The weapon is named after Excalibur, a legendary sword used by King Arthur, which was attributed with magical powers.