As was the case with Luthians, The Cinder were created for the sole purpose of waging war upon neighboring Kingdoms. Who created them is unknown.
Using the volcanic rock and a particularly hardy breed of tortoise, they were created to be strong, and hard to kill, which they were. Unfortunately, due to their make up they proved very weak against cryomancers. They were eventually pushed back into the volcanic region where they came from. It is assumed that whoever did create the Cinder, has since been dispatched.
The Cinder, strong yet generally mild mannered, live in the Volcanic regions in Southern Kherra. They fashion caves into the mountains and tap into thermal vents. It is in these caverns that they make their home. While they do accept visitors, strangers generally do not stay for long in their towns, due to the temperature and amount of volcanic ash in the air to which the Cinders enjoy.