Kshatriya
Kshatriya the second and lowest caste or varna in the traditional four sectioned division of Indian society. Their assigned and expected role in Vedic India was that of warrior and administrator, a higher caste of royalty and rules. The four Varnas being Brahmin, Kshatriya, Vaisya, and Shudra.
In the BKWSU, the term is used for second class BKs who fought with their impure nature and did not overcome it thereby domed to re-incarnate in the "Silver Aged" in the next Cycle. It is a term that could be interpreted as slightly contemptous or disparaging.