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 in place of the blade. As matter increases in temperature, it passes through the solid, liquid and gaseous states, and once at a high enough state reaches a level of plasma. Such process requires the wielder to use their Ignition Ability to increase the temperature of their flames to this point. As noted by Takehisa Hinawa, the swordplay using Excalibur is equivalent to plasma cutting. Arthur exclusively uses Excalibur with his right hand; while using Excalibur with his left hand, he is not able to fight to his utmost.

Appearance
Excalibur is a peculiarly designed sword, consisting of only a hilt. The hilt consists of a spiral shaped handle, and a cross at the top resembling that of the cross used in the Special Fire Brigade. The plasma is emitted from the top of this cross in turn of where the blade of the sword usually is. It's sheath is of plain light material.

Trivia

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