A sword known to be formless and created with pure intangible energy. It was a legend that's been known to Wulin and martial artists starts to recognize it as a mark of someone achieving enlightenment since it was a legendary high-level sword technique that can only be used when one has achieved the legendary Divine Master Level.
History[]
There was once a legend about a superhuman who could control volcanic energy and had been given the title of the undefeated swordsman. However, that man never carried a sword with him. In his curiosity, one of his disciples had asked him about it.
[Since I can use the Invisible Swords, it would be meaningless for me to use any other kind of sword.]
Even if he was considered a legendary swordsman, the disciple had taken his teacher's words as a bluff, and was in disbelief at the existence of such a thing. Because of that, his teacher had decided to show him the sword he could create by simply using his attribute energy. The disciple who had witnessed such an unbelievable thing, had bowed his head and apologized for distrusting his teacher.