Chronicle of Ages
The first Iuchi learned the techniques of being a Shugenja and commanding the elements from the Isawa teachers that came to the clans to teach them. Thus the primary Shugenja family was born for the Unicorn.
During their time outside of the Empire the Iuchi interacted and learned of different ways from the gaijin tribes they encountered. They learned of magic’s that relied more on knowing the true name of objects and items instead of through commands to the kami. This magic named Meishodo has been viewed generally negatively by the rest of the Empire as foreign and outside of the normal Celestial order of things.