The Osha Clan was a former Mojin clan that is notable for originally being the clan which had Echo and Iron Axe before it was disbanded. However, later in the story, the clan was re-formed.
The Osha clan was originally a Mojin clan which had Echo as a Divine lady of the clan. However, after her brother was killed in a Holy duel against the Iron Whip clan, the Osha clan was destroyed. Most clan members were sent to the Endless cape where most did not survive. Iron Axe settled in the Western region of Graycastle and Echo was sold off as a slave.
However, after Roland sent a military expedition to the extreme southern region, Iron Axe created a new Osha clan with Echo being the divine lady and leader. This was done by taking over one of the watchdog clans at one of the smaller Oasis in the extreme south. Through this, for the first time in recent memory, the Osha clan challenged different clans every single day and won them all. This propelled them to become the most powerful clan in the extreme south and thus the de facto rulers of the extreme southern region.