A 'black mass novel' is often a type of fictional work that might involve themes related to the black mass, which in some historical and cultural contexts was a perversion of the Catholic Mass, used in satanic or dark magic rituals. However, in a more general sense, it could be a novel that uses the concept of the black mass in a metaphorical or fictional way to explore dark, mysterious, or occult - themed stories.
The 'Black Mass' is often associated with satanic or dark rituals in popular culture. In reality, in some historical and religious contexts, it was a perversion of the Catholic Mass. It involved elements that were the opposite of the sacred, such as using inverted crosses, speaking blasphemies. However, much of the modern understanding is also clouded by fictional and sensationalized portrayals. There were some cases in history where groups or individuals tried to perform such anti - religious acts as a form of rebellion or heresy against the established Church.
In fact, Black Mass takes elements from true-life crime stories. It fictionalizes some aspects for dramatic effect but retains a core based on real happenings.
One example could be 'The Monk' by Matthew Lewis. It contains elements that can be related to the idea of a black mass in terms of the dark and immoral actions of some of the characters within a religious context.