Black Magic is Not a Myth in Articles by Aleister Crowley.

“There are many ways of abusing the Sacrament. One of the best known of which is the ‘Mass of Saint Secaire,’ the purpose of which is to cause an enemy to wither away.” [via, also]

Consider also:

  1. “I have been accused of being a ‘black magician.’ No more foolish statement was ever made about me. I despise the thing to such an extent that I can hardly believe in the existence of people so debased and idiotic as to practice it.”
  2. My Mer-Ka-Ba
  3. “Witchcraft is a more or less solitary form of black magic.”
  4. “The priest must be careful, however, to consecrate the Host in the orthodox manner. The wine has been adulterated with magical drugs like deadly nightshade and vervain, but the priest must convert it into the blood of Christ.”
  5. “A renegade priest gathers about him a congregation of sensation-hunters and religious fanatics; then only can the ceremonies of profanation be of extended black magical effect.”