Mountain School

Thunder School (山流, Yama-ryū; literally "Way of Mountain") is one of the eight schools of Physical Natures that make up all of Taijutsu. It focuses upon a ratio of Sei and Dō concepts, with Sei serving as the dominant source of energy while Dō is the supporting factor. Mountain is the nature of stillness and immovability. It is a landform that exists as the pure natural embodiment of the term "immovable", and this school reflects upon this idea.

Similar to the Earth School, which preaches receptive movements inward rather than expansive movements outward, the Mountain School is highly focused upon stationary defensive movements so as to ward away enemy assault without expending unnecessary effort. Furthermore, it allows the practitioner to prepare for a counterattack.