Black Heaven and Earth Technique

Black Heaven and Earth Technique (黒の天国と地球の技術,Kuro no tengoku to chikyū no gijutsu) is though to be one of the greatest of the chakra circulation techniques. During his first use of this jutsu, Azusa lost his rational thought and blacked out. Upon waking up, he discovered he had slaughtered multiple enemies with no visible damage to himself. The specifics of the technique are not fully understood, but it is implied that the technique allows the user to become many times stronger than they would be without it.

Despite its advantages, it is notoriously for its extreme difficulty to use. Even Mikage fell into a blind rage upon using the final stage of the technique.

The final stage of the technique, called the black origin threshold, allows the user to access monstrous quantities of physical strength at the cost of rational thought. This is shown when Mikage enters the state and promptly decapitates a near kage level ninja one punch. While in this state, the users fighting style becomes animalistic, with no form and only focuses on destruction and power.