[Ouroboros]: 自分's infinite regeneration ensures he will never die, even when every single morsel of his existence is erased, as it cycles from the void back into existence. [The Infinite Cycle]: As 相手 obliterates 自分, the energy/power from 相手's attacks are absorbed within 自分, gaining a part of 相手's ability, which he recycles/collects into the vast [Nexus] of his [Gallery of Swordsmanships]