Black magic is an ancient art of magic
that dates back to the dawn of mankind's questional ability to psychic powers and domination of others through incantation.
Black magic's main use is to hurt others that the sorcerer
deems unworthy, inhuman, and in need of pain through psychic visualisation and realisation of Universal law and movement along with group incantation.
It can found to be used without incantation. Incantation was a form used by people in group settings so that magic could multiply among its users.
When one uses black magic the pain brought back to the caster
of the spell uses inflicts damage that is twice as worse upon themselves.
This is why a dark wizard must be a very very very cold hearted bastard and not care about anyone or anything around them, even their own life.
My mom lost her job after I cursed a female I hated. Funny enough, Nikki lost her job too.