Iuchi

Iuchi was a member of the Ki-Rin Clan during the dawn of the Empire and was a powerful shugenja. When the Ki-Rin left Rokugan to explore the rest of the world, they encountered the Rocs, which attacked the Clan. Using a powerful spell, Iuchi caused a rockslide in the mountain pass that killed not only the Rocs but also a large number of Ki-Rin samurai and one of Shinjo's sons. With the pass back to Rokugan now blocked by the landslide, the Ki-Rin split up to look for another way back home. (SotUnicorn, p. 8)