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in the Roman Catholic church, a requiem mass during which the celebrant wears black vestments. The term is more commonly used, however, for a blasphemous and usually obscene burlesque of the true mass performed by satanic cults. The naked back of a woman often serves as an altar, and a validly consecrated host is generally used to intensify the mockery. The rite commonly incorporates other elements of satanic magic such as philtres or abortifacients.