"The Weapon Does Not Matter; You Can Just Perform Swordsmanship With Air" - 自分 says as he breaks his [Unbreakable Divine Sword]. 自分 can even perform swordsmanship using the surrounding nothingness With it, he can cut the fabric of reality, erasing existence in the process 自分 shows 相手 the true essence of swordsmanship isn't about becoming one with the sword, but forging the sword of the mind.