Many used to think Atharva veda has a great cognition of black magic spells. But atharva veda does not have the cognition of black magic spells B ut it has cognition how to manipulate the energy. to define the black magic... Black magic is the process of direction the concentrated negative energy on a specific person to harm him.
People whoever do this is called as the sorcerers. There is a village called mayang which is IMayong 40 kilommeters drive away from Guwahati. This is called as the land of black magic. People used to say that the tantriks at that place can make the person disappear with their mantras.
in the second place, the most powerful tantriks of our country are in kerala(india). The black magic exists not only in india it also exists all over the world. In some countries it is called as withcraft, black magic, voddoo. Whatever the names it has, the practice and the purpose of doing it is the same.