Black mass

Nature

A Black Mass is a ceremony celebrated by various Satanic groups. It has allegedly existed for centuries in different forms, and the modern form is intentionally a sacrilegious and blasphemous parody of a Catholic Mass.

In the 19th century the Black Mass became popularized in French literature, in books such as Satanism and Witchcraft, by Jules Michelet, and Là-bas, by Joris-Karl Huysmans.

Modern revivals began with H. T. F. Rhodes' book The Satanic Mass published in London in 1954, and there is now a range of modern versions of the Black Mass performed by various groups.

Source: Wikipedia

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(G) Very specific problems