conjure vs mana

conjure

noun
  • The practice of magic; hoodoo; conjuration. 

verb
  • To imagine or picture in the mind. 

  • To evoke. 

  • To perform magic tricks. 

  • To summon (a devil, etc.) using supernatural power. 

mana

noun
  • Magical power. 

  • Power, prestige; specifically, a form of supernatural energy in Polynesian religion that inheres in things or people. 

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