Onmyodo

Onmyodo is a natural science which encompasses fortune-telling, spellcraft, and astronomy. Onmyodo as a practice is overseen and officiated by the Onmyoryo.

History
The first documented use of the earliest form of Onmyodo was around the year 125, by seafarers who were adept at using heavenly bodies and ambient elements. These skills would come in useful in navigating the waters and deciphering cosmological activities. These early Onmyoji were capable of evading danger which lurked in the waters, and accurately foretelling the weather and temperature. Ashihara would come to know this early form of natural philosophy as Onmyodo.

Onmyodo has since evolved into a legitimate natural science and a practical means to work with nature. Onmyoji draw energy from the ambient Go-dai dwelling all throughout Ashihara or borrow energy from auspicious sources such as Kami, which are directed into a spell through written conduits.

Through their mastery of the Go-dai, a well-prepared Onmyoji is capable of expelling and controlling the flow of Kegare faster than a priest can - and therefore especially wanted by the Isshin Renritsu Kubun.

Onmyoji
Onmyoji are practitioners of Onmyodo.

Shikigami
Shikigami are conjured beings, made alive by giving up life force. This life force is given form through a conduit, usually weapons, or straw and paper dolls. Because of this, shikigami are considered to be an Onmyoji's symbol of power.

Youmagatana
Youmagatana are ancient weaponry that have accumulated copious amounts of energy and have become a yokai naturally over time, or a weapon that serves as a vessel to seal a yokai. Onmyoji that wield Youmagatana cannot be weak of will, as they risk being overpowered by their weapon.