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Amatsushi is Zenjou Kaguya's first original technique. Created during his exams, He drew upon the heavenly Peafowl's power during a desperate situation in which he needed to increase his arrows strength. He discovered that by overriding his arrow with chakra using Yumi no Kokkai as a pathway, each arrow would gain an immense concussive boost in power. It was originally thought to favor concussive damage over piercing. The peafowl's are known for their majestic nature, yet their wings can cut through enemies cleanly. It is a blast that can cut cleaningly through all in it's path. A unique aspect to this technique is it's physical representation. When fired, Tenrai morphs into an energized charging peafowl. It is even know for releasing thundering roars as it approaches his enemies with hellish hooves. Zenjou's title as the Desert's Heavenly Ox was gifted after shinobi witnessed a mastered version of this technique. Shinobi began to classify Tenrai Shiro Kujaku as one of Sunagakure's Absolute Offensive abilities. Being there little to no defenses capable of fully holding it back. It is known for leaving a path of destruction behind it. All before it is trampled or sent flying. A truly concussive blast, it is an attack capable of destroying fortresses.
Zenjou's greatest aspect of this technique is it's freedom of control. He is able to manipulate it's size by controlling the amount of chakra fuelled into such an arrow. Smaller arrows are excellent for human targets while larger enemies and stronger defenses call for a incredibly larger blast. Ultimately, that is the ultimate description of this technique. A blast which an arrow controls. Those who witnessed it's first completed usage dubbed it the "Tenrai" from the high concentration of energy morphing into the shape of a peafowl soaring across the land. With careful concentration, Zenjou is able to control it's trajectory.