In Reiger's view, Tsukiguni Yoriichi was undoubtedly the pinnacle of combat ability in this world.
Not only because he created the breathing techniques and brought them to the people of this world, but also because his natural talent was truly superhuman.
He was born with an innate understanding of the principles of the breathing techniques, and the Sun Breathing technique was something he created after organizing these principles.
He was even born with cheats; not only did he have a pattern on his forehead that greatly enhanced his physical abilities, but he also naturally possessed the "Supreme Domain" that Akaza once mentioned, displaying extraordinary strength from childhood.
He also had an experience where he nearly eradicated the source of all ghosts, slaying the Ghost King who had survived for a millennium, causing the Ghost King to develop a psychological shadow. The Ghost King hid himself, unwilling to appear in this world until his death.