Shinobijutsu

Shinobijutsu (忍術, lit. "Assassination Method of the Ninja Warrior") is an ancient practice and one of the various fighting styles witnessed in the Heroic Chronicles storyline; it's alternatively referred to as "Nindō" (忍道, lit. "Life Style of the Shinobi"), and is considered to be a sacred art that has close ties with other combat methods, such as Hyperform and Onmyōdō. It's described as the skill of "using the internal energy of one's self and external energies of the world simultaneously" (同時に、世界のーの自己と興起の活性化活力を使用して, Dōjini sekai no ichi no jiko to kōki no kassei-ka katsuryoku o shiyō shite) — basically the synchronization and transformation of two energy sources, making it a bit similar to the concept of Magic — specifically, the primal art of Enchantment.

A common misconception that people have about this fighting style is that it utilizes an alternate form of energy for casting; in truth, it's rather "universal" in terms of type of energy utilized in conjunction with it. This makes it the first of its kind to incorporate Magic, Ki, Ley Line energy flow, and everything else of a similar nature; ever-changing and very flexible, its considered to be the first and only fighting style to make use of multiple types of energy — allowing for a myriad of variations to be conceived.

Though rarely seen in the modern era, it's exceptionally powerful with the capacity of overwhelming even the strongest fighting style given enough time to master. Shinobijutsu is something that's practiced in small, hidden villages due to the fear of the art being abused by what the villagers dub as "outside evils". Typically enough, its practitioners are dubbed by a certain title, not unlike other fighting styles; in this case, it's Shinobi (忍, lit. "Ninja Warrior").

Trivia

 * If one couldn't tell, the foundation for this article is based on Ninjutsu from the popular anime/manga series, Naruto. To an extent, this also includes the concept of Ninshū, it's predecessor. The author basically wanted to bring such a concept from said series and incorporate it into his storyline, as there are some ninja-esque characters in it, namely those listed above. Interestingly enough, this is also based on Per's interpretation of Enchantment to some degree, namely in the way its utilized and its standing in the general public.