Busoshoku: Seigyo

Busoshoku: Seigyo (武装色 制御, Busō-shoku: Seigyo; literally "Color of Armaments: Control") is an advanced technique. By imbuing Haki through the ground, the air, or even other elements of nature, one is able to essentially imprint their life energy onto it as an exoskeleton, allowing them to shift and control its movement to utilize as a weapon.

Only those who have reached at least Sixth Dan within the Haki Development System can utilize this technique.

Overview
Busoshoku Haki is a power of the body, allowing for one to utilize it as an extension of themselves during battle. With this skill, they are able to imbue themselves, or a weapon, with Haki to strengthen their attacks. When mastery over Busoshoku is taken even further, one learns how to imbue Busoshoku Haki into other things, even the ground beneath them or the air around them. In doing so, they spread their Busoshoku Haki like veins, imprinting their control over it and forming it into a shape before moving it through sheer force of will.

With this technique, the user can create an arm out of the earth to grab and crush their enemies. They can compress controlled portions of air around them and send concentrated bursts out against their opponents, even slash at them with focused wind strikes. Other elements are also susceptible, the scope being proportional to the level of skill of its user. It can even be used against elements created by Devil Fruits, imprinting control over some part of it to offset the opponent's own attacks. Through sufficient mastery of the technique, a user can apply Busoshoku: Seigyo in bursts, controlling the elements to follow their own movements in battle.

It can even be used against opponents themselves. By imprinting one's Busoshoku onto a target's limb, they could control their enemy's body part as they see fit, assuming their will is stronger than that of their opponent's own will. The technique can be applied to one's self as well; if their bodies are too injured or incapable of moving due to paralysis, they can imprint onto their bodies to force movement.

Behind the Scenes
This concept was created based on several sources, such as "The Compulsory" and Ransōtengai, both from the anime and manga series Bleach, as well as the Bending arts from the television series Avatar: The Last Airbender.