Ittou Rasetsu

Ittou Rasetsu  ( 一刀羅刹, One-Blade Rasetsu ) is the strongest Noble Phantasm of Haise Ishida and is his improvised use of Ittou Shura where Haise focuses the incredible power of his original power from a full minute of use into a single second. This includes performing acts Haise normally never does with Ittou Shura, including shutting down his five senses along with all his bodies' function such as being able to breathe as well as mustering all the strength that he had within himself for a single second instead of the usual single minute making it ten-times as powerful further increasing his strength hundred-fold. It was described as being a technique exceeding the limits beyond limits and it won't be a man who fell into the realm of Shura, but the Rakshasa, which exceeded humanity.

Weaknesses
Due to being ten times as strong as Ittou Shura, Ittou Rasetsu put a heavier strain on him than the original more than his body was able to endure causing several injuries the first time used as such it is considered to be a self-destructive Noble Art used as a last resort.

He managed to at least partially overcome this with his Ittou Tendou as he can activate it with his Ittou Shura active, only losing a 3rd of his Time with it (Going from 60 seconds to 40 or 40 to 20) but he can still fight with it, ignoring the drawbacks by shutting off his senses (Usually starting with Pain) until he is eventually unable to use any of his five senses (Although his Perfect Vision makes up for this)