What does archimage or archimagus mean?
The definition of archimage and archimagus
Ar”chi*mage, Ar`chi*ma”gus, n.
Etym: [NL.; pref. archi- + L. magus, Gr.

1 The high priest of the Persian Magi, or worshipers of fire.
2 A great magician, wizard, or enchanter. Spenser.