magus vs runemaster

magus

noun
  • A magician; (derogatory) a conjurer or sorcerer, especially one who is a charlatan or trickster. 

  • A Zoroastrian priest. 

runemaster

noun
  • One who has mastered the use of runes for magical, divinatory, or other esoteric uses. 

  • A runesmith; one skilled at carving and deciphering runes. 

How often have the words magus and runemaster occurred in a corpus of books? (source: Google Ngram Viewer )