Xiao Nuru/Nen

Nen
Xiao is a specialist, meaning his abilities don't fall under the other five nen categories of enhancer, transmuter, manipulator, conjurer, or emitter. His specific ability allows him to create pills from his Nen that produce a variety of effects, ranging from medicine that can cure any illness, poison so deadly it can kill anything in a matter of seconds, or a pill that will increase power ten-fold. Each pill has five different stages each one requiring more Nen and concentration to create than the last, however their effects become more potent with each stage.

Nen Expert
Xiao is an expert at Nen, allowing him full use of basic and advanced forms of Nen, however he is unable to perform other Hatsu at full power.
 * Ten- Once a person has had their aura nodes opened, they must learn to keep their aura from leaking away from their body. Ten (纏, Envelop; Shroud) is the process of keeping the nodes open, but also having aura flow through and around the body rather than away from it. Once maintained, it creates a shroud around the user that feels similar to standing in lukewarm, viscous fluid. Having a shroud of aura surround the body is the most basic defense against the emotional attacks from other users of Nen, however, it can't defend against Nen physical attacks. Ten maintains youthful vigor and reduces one's aging; since the energy powering the body no longer leaks away, one can keep the body from breaking down and deter the aging process. Through frequent meditation, one can improve the quality of their Ten.


 * Zetsu- While Ten allows a user to keep aura from leaking away from their body, Zetsu (絕, Suppress; Null) stops the flow of aura from their body altogether. By closing all of their aura nodes, the user is able to stop almost all outflow of their aura like water from a valve. Since the user is no longer surrounded by their own aura, they are more sensitive to the aura of others. This can be useful when tracking another person and it will also prevent other users of Nen from noticing them. Zetsu can also be used to relieve fatigue, since it forces the body's external layer of aura to be fully contained within. However, since Zetsu involves shutting off one's aura, it can be dangerous due to it leaving the body defenseless against any aura attack. Even a weak attack enhanced with Nen could do massive damage.


 * Ren- Ren (練, Refine; Enhance) is a direct application of Ten. Since a user is capable of keeping aura from leaking away from the body, it's also possible for them to produce more aura around themselves without having to worry about losing it. Ren focuses on outputting a high amount of aura and keeping it on the body, expanding the size and intensity of it. If Ten is considered to be purely defensive, then Ren typically what is used for offense. This increases the user's physical strength and durability and provides a large pool of aura for any advanced techniques or individual skills they decide to use.


 * Gyo- Gyo (凝, Focus) is an advanced application of Ren by which a Nen-user concentrates a larger than normal portion of their aura into one specific body part. Gyo increases the strength of that one body part, but leaves the rest of the body more vulnerable. Gyo is most often used in the eyes, allowing a Nen-user to see aura and things which would otherwise be hidden (e.g. Nen objects hidden by In).


 * In- In (隱, Conceal) is an advanced form of Zetsu used to almost completely conceal one's aura. However, unlike Zetsu, In does not require the user to stop their aura flow, but hides it instead, making this technique perfect for launching a sneak attack or laying traps. In can be countered by using Gyo in the eyes or through En.


 * En- En (圓, Circle) is an advanced application of Ren and Ten. In Ren, aura usually envelops only a small amount of space around the user's body. En is when one extends their Ren so that their aura extends further than normal, then uses Ten at the same time to give shape to the aura, usually a sphere. Someone using En can feel the shape and movement of anything entering their circle. The downside to this is that it is extremely tiring and draining for the Nen-user to constantly deploy so much aura. Those who master En are typically able to extend their En to a circle of a 50m radius. However Xiao can extend his En up to 6 km.


 * Shu- Shu (周, Enfold) is an advanced application of Ten. Shu allows a user of Nen to extend their aura's envelopment onto an object, allowing them to use that object as if it were an extension of their own body. For example, one could use Shu to extend their Ten around an object, which would strengthen and protect the object like the way Ren strengthens and protects their body.


 * Ken- Ken (堅, Fortify) is the advanced version of the basic Ren technique. Ken is a defensive technique where a Nen-user maintains a state of Gyo over their entire body, allowing them to defend against attacks from any direction without the need to use Ryu. Ken is useful as a defensive position, but is tiring to maintain. Additionally, it is not as strong as Gyo on any given part of the body, since it protects the whole body evenly. Because of that, it is used to guard when one wants to be cautious.


 * Ko- Ko (硬, Temper) is an enhanced version of Gyo in which all of an individual's aura is concentrated into one particular body part. Zetsu is used to completely stop the flow of Nen in all other parts of the body. This makes that one body part exceptionally powerful, but leaves the rest of the body completely unprotected. This is used by some Nen-users as an offensive technique (a Ko-punch would carry all 100% of your aura with it), but it is a risky move — leaving the rest of one's body unprotected in a fight against another Nen-user is generally not a good idea. Ko results in one's aura creating a high-pitched dissonance, somewhat akin to the sound of metal being ground.


 * Ryu- Ryu (流, Flow) is the term for real-time use of Gyo (the adjustment of aura concentration in various body parts) by a Nen-user in battle. For example, the use of Gyo to increase the amount of Nen in a fist as one strikes with it, to increase damage done; or to increase the amount of Nen in an arm as it is used to block a blow, for extra defense.