The best-selling manga Hunter X Hunter is famous for its complex approach to characters' powers and abilities, especially "Nen", a technique that allows manipulating one's aura, the life energy produced by every living being, for various purposes. Because of how intricated Nen rules and applications can be, fights between the strongest Nen users in Hunter X Hunter are always memorable, but it can also be challenging to understand how it all works.
Throughout Hunter X Hunter it's explained that aura constantly escapes from the body's «aura nodes», resulting in a slow leak of energy. Nen users are able to open and close their nodes at will, and to stop the aura from leaking, keeping it around their bodies, changing its flow, and focusing it for various purposes. To reach that stage, Nen users need to master the «Four Major Principles»: Ten, which keeps the aura around the body; Zetsu, which stops the flow of aura completely; Ren, which allows a greater aura output than usual; and Hatsu, which is the personal expression of each user, their special «Nen ability» that has unique paranormal effects. After mastering the Major Principles, these can be combined to obtain advanced techniques, for example extending and shaping a user's aura, or focusing it all in one point of the body for devastating attacks. All of this combines to form some of Hunter X Hunter's most dangerous Nen abilities. The protagonist Gon and his friend Killua were trained in these advanced uses by Biscuit, an experienced Hunter on Greed Island.
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The exact effects of Hatsu are determined by the user's aura type, which is divided into six categories: Enhancement (strengthening
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