Blood Release: Skyscraper (血遁・魔天狼, Ketton: Matenrō; Literally "Blood Release: Demon-Heaven Wolf") is a forbidden technique of the Blood Release nature transformation that Muketsu devised. Its extreme power and associated consequences, when first used by Muketsu, caused him to inch very close to death as a teenager. However, following his awakening of a certain trait, Muketsu began to reinvent the possibilities of the technique. While still a very harmful technique, it appears that it may be used in extreme circumstances without immediately causing his death.