The word "wert master of" implies a sense of control and domination, but there are several antonyms that can be used to express the opposite meaning. Some antonyms for this phrase include "subordinate to," "inferior to," "servile to," "subject to," "dependent on," and "under the authority of." These antonyms suggest a lack of power and control, and imply that someone is not in charge or is inferior to someone else. By using these antonyms, one can convey a completely different meaning and tone, emphasizing humility and subservience rather than authority and control.