Bishamonten

The Bishamonten (毘沙門天) is an ability only those that have mastered the core teachings of Ninshū are capable of preforming. It allows the user to manifest their very essence onto the world, given life by natural energy, which creates an avatar crafted by the user's own imagination. Ideally, it is a technique which connects the "internal" and "external", allowing one's soul to actually manifest in order to preform the desired tasks. Once done so, the construct surrounds the user, much like the Susanoo technique. It is regarded as a guardian deity which gives its master the strength necessary to protect the entire world from the darkness that threatens to destroy it.

Overview
According to Seireitou Hyūga, only an individual with a particularly potent life force and a strong desire for change can utilize the Bishamonten. Just as chakra itself can become visible in high enough concentrations while released externally, an individual with a powerful life force can quite literally project their own spirit onto the outside in the form of an avatar. It typically takes on a form that best reflects their personality and mannerisms; ideally, a perfect representation of their soul and state of mind.

The avatar can manifest in one of three ways, depending upon what the user desires of it. It can encase them in a shroud, much like the Susanoo, granting a powerful defensive armor during battle. Another method is to allow it to manifest behind the user, being mentally commanded to act in accordance with its master's wishes. And the third method is to manifest the avatar as a separate entity entirely, allowing it to move and act at a distance away from its user. It is possible to also use the third method in such a way that it shrouds other individuals, through Ninshū, granting said individual the use of that person's Bishamonten. Because of this versatility, it is arguably a weapon of limitless use during battle.

Asura's Version
When used by Asura, the Bishamonten takes on the form of a three-headed, six-armed avatar wielding several dark-colored spheres. Although smaller in size, this avatar was capable of going head to head with his brother Indra's final Susanoo. It is remarkably similar in form to that of a Bijū.

Trivia
In Buddhism, Bishamonten is the chief of the Four Heavenly Kings. He is depicted as a armor-clad god of warfare and warriors.