Family and clan formerly lived on the lower slopes near the skyreach mountains (can be changed if not suitable, copper dragons/ dragonborn come from hills/ rocky mountainous regions which is why I didn’t use the red waste from your map of the world). A goristo one day rampaged through destroying everything in its path, including the whole Daardendrian clan and their village. Zrayax was out hunting when the Goristo rampaged, hence Zrayax survived. On his return, he saw his entire village flattened and in ruins. The bodies of his clan strew across the place, battered and blodied. He found his family buried under the rubble that had previously been their abode. His only connection to his former clan is the walking staff he carries with him, which belonged to his father before that fateful day.
Since then Zrayax has been roaming the worlds making companions and questing with them looking for clues as to where this Goristo ended up, so that one day he can gain vengeance on the creature that took all that was once dear. Due to his lack of family, Zrayax holds friendship very dear and will always defend those close to him, almost with disregard for his own life.