Hashū

Hashū (剥宗, Fading Sect) is described by Ryuuki as the exact opposite of Ninshū. While Ninshū focuses on connecting people's spiritual energy's together, this focuses on severing any spiritual connections to try to spread chaos and havoc throughout the shinobi world. To make sure spiritual connections stay severed any person who dies at the hands of this style of combat will have their soul's absorbed and forced to suffer for all eternity. How different it is from Ninshū may be the source of Hashū's tremendous power.

To use Hashū, Ryuuki must use his chakra to generate and then release highly destructive blue or red colored energy, called chaos energy, from any part of his body. Chaos energy can be released and manipulated to perform a lot of different combative feats. However, its chaotic nature makes it impossible to be used for supplementary purposes like healing or Space-Time Ninjutsu.

Chaos energy isn't limited to spreading chaos through a single method, but many. It can inflict fear in its opponents, destroy someones mental state, create small natural disasters, and negate regeneration and healing abilities and techniques, disrupt the flow of chakra, absorb chakra, and other chaotic effects. Using this style of combat does come with drawbacks. The first is it influences Ryuuki's mind as well. Every time he uses it Hashū will make Ryuuki more ruthless and violent. There are even times when Ryuuki will lose all sense of reason and go berserk, killing anyone who dares cross his path.

Ryuuki believes that if he isn't careful he may lose all sense of individuality and become the personification of destruction and chaos. To prevent this from happening Ryuuki will often limit how many times he will use this form of combat to no more than three techniques per minute. The only time he will let himself use Hashū freely is when he is facing Otohime or someone else he hates just as much.

Trivia

 * Hashū was based on my interpretation of Acnologia's Dragon Slayer Magic.