mystagogue
‘one who prepares candidates for initiation into a mystery cult, or one who holds or spreads mystical doctrines’
Lexical development traced from the Tamil root:
E. mistagoge, mystagogus, mystogogue < Lat. mystagogus ‘a guide to the mysteries’ < Gk. mystagōgos < mystēs ‘one initiated into the mysteries’ + agōgos ‘leading, a leader’ < agein ‘to lead’ < ugh < ag- < Tamil ukai