Mongrelfolk, or mongrelmen, were the result of an experiment by an accomplished wizard. The wizard had wanted to find a good replacement for dopplegangers, one that could be controlled easily. His experiment succeeded, and the mongrelmen infiltrators were born. They were able to take the shape of any being they ate, only the wizard didn't think far enough ahead for his experiments. The mongrelmen infiltrators were unable to reproduce with their natural genes, and instead their children were born with pieces of creatures they had shifted to throughout their services. Their offspring were also unable to shift their form. The wizard's name has been lost to time.