The Touch of Darkness

By definition, a practitioner of Black Magic is someone who specialises in the casting of offensive, aggressive and destructive spells. Black magic centres around the theory that "the best defence is a good offence" and thus concentrates on the use of magics that are meant solely for the purpose of destroying. To this end, the Black Magician must learn the arts of many different caster types, picking and choosing which spells to keep and which spells to discard. Also, as with all distinct caster types, Black Mages (the term used for a practitioner of Black Magic, despite the fact that they are not true mages, but are rather only mages by the etymological definition of the word (i.e. a Magician)) have a few spells specifically of their own.
The Black Mage's spells (remember, these are not real Mages) come from a variety of what might be loosely termed, "The Casting Arts". Though there are a lot of religions which use magic in one form or another, the Black Mage's arsenal comes from the casting arts which are listed here, in The Library of Knowledge. Having an affinity for destructive spells, the Black Mage hones only those spells which bring about the decay or destruction of their target, believing that this is the only useful way to progress in life and magic. Unlike a Sorcerer, the Black Magician may worship certain deities (perhaps even themself, as the Satanist does), and may hold to certain rules of casting which they find improve their performance.