mystagogue (n.) Look up mystagogue at Dictionary.com
"person who initiates into mysteries," 1550s, from Latin mystagogus "a guide to the mysteries," from Greek mystagogos, from mystes "one initiated into the mysteries" (see mystery (n.1)) + agogos "leading, a leader" (see act (n.)). Related: Mystagogic; mystagogical; mystagogy; mystagoguery.