If a Caitiff is an individual without a clan, an Autarkis is an individual without a sect. Since most clans are a combination of cultural, political, and hereditary ties, to be labeled Autarkis, thus not belonging to the sect of the clans, may entail being labeled a Caitiff, but not necessarily. Becoming an autarkis does not change the blood of the Kindred, but severs the social political ties with the clan proper.
