From publisher blurb: The OSR Dervish is a new class for OSR games. A sub-class (or variant) of the Cleric, the Dervish is unarmored religious warrior whose dancing and gyrating give him or her an improved unarmored armor class similar to that of a monk. They also fight with bladed weapons. Although primarily intended for first advanced edition, it also contains tables for other popular versions: original edition, basic and expert edition, and the cyclopedia edition.