Shugenja

Shugenja IRL were ascetic Monks who existed in Japan between the 7th and 14th centuries.

They were the Japanese equivalent of Shaolin warrior monks; who spent most of their days in contemplation and learning but also trained their bodies to perform spectacular feats of endurance and martial prowess.

This quest for physical perfection was what made them appear supernatural to the common man, whilst their knowledge of various topics such as philosophy and medicine gave them the legendary reputations as "wise men" and made them highly desirable advisors to diamyos, taking the equivalent roles as court "wizards" in Japanese culture.