Black mass

An enormous number of monks and priests gave themselves up to sorcery, and there was no lack of apostate priests to perform the ceremonies of the Black Mass.

As a parish priest in England he had dabbled in the black arts, seduced a number of his congregation from their faith and finally celebrated the Black Mass.

Elmos and Maureen had draped their room in some old purple rags and were about to start a black mass when the police arrived.

Generals gathered in their masses / Just like witches at black masses