Feudal Drudge was a term used to describe the lowest class of people in the feudal system. The two crossword solutions, SERF and ESNE, both refer to this class of people. A SERF was a peasant bound to the land and obligated to provide labor services to their lord, while an ESNE was a slave-like servant who was owned by their lord and could be bought and sold. Both SERF and ESNE were considered part of the Feudal Drudge class, and were subject to the harsh conditions of the feudal system.