Ryo:is the term for use of Gyo from a state of Ken to perform real-time offensive and defensive value adjustments. If Kodevolves 100% of one's aura to offense or, much more rarely, to defense, and Ken splits it evenly between the two, Ryu is redistributing one's aura according to any other percentage, for example by focusing 70% of one's aura in one fist as one is about to strike, or 80% in one's leg to block an incoming kick. It is utilized to damage a Ken user without leaving oneself as unprotected as during Ko, although the power of the technique is lower. Ryu is difficult to master, as it requires not only to control one's aura flow with great precision, but also to be able to estimate the amount of aura utilized by the opponent at a glance. Even if the technique is performed correctly, the movements of the aura flow risk giving away the user's next move if they are too slow.
Gyo: 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. It 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 Nen constructs concealed with In as well as traces of aura that so faint that they might go unnoticed otherwise.
An alternative version of this technique gathers only the aura naturally leaking from the body instead of the greater amount produced with Ren. This application of Gyo can still increase the amount of aura in one select body part and thus its power, but the output is much lower than what is obtained through the regular technique. It is unlikely this lower-consumption Gyo could counter In, since Wing had all his students perform Ren to do so. However, it has proven to suffice to see thin layers of aura as well as to perform Water Divination correctly.
Shu: Shu allows a user of Nen to enshroud an object with their aura, allowing them to use that object as an extension of their own body. For example, one could use Shu to extend their Ten around a weapon, which would strengthen and protect it. Shu can be combined with other techniques, such as Ko.
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