The Zeus Mace is a mace in Final Fantasy XII. Having it equipped increases the user's damage dealt from Dark attacks. In the original version, its license costs 25 LP. In the Zodiac versions, its license costs 65 LP and it can be used by the Red Battlemage.
Zeus is the "Father of Gods and men" who rules the Olympians of Mount Olympus as a father rules the family according to the ancient Greek religion. He is the god of sky and thunder in Greek mythology.