Fire Sword

A sword capable of emitting and freely manipulating vast amounts of fire, can incinerate whatever is in its path. It can be used to send light beams as signals through the green sphere at the end of the blade. It can also be used to summon the Infinite Armour, the Garian Sword, and the Weaknessless Soaring Shortswords.

Trivia

 * When Seimei wore the Infinite Armour, he had this sword integrated into the head of the armour's forehead portion by its hilt.