Black magic, also known as witchcraft and Gu technique, has been obsolete for thousands of years in the country, with its inheritance cut off. It only exists in Southeast Asia and is quite popular there.
The reason for its discontinuation within the country does not involve dynasty changes or sect internal conflicts, but simply because it's outdated and was swept away by the tides of the times.
Just like after the Industrial Revolution, human civilization advanced rapidly, and many ancient god beliefs in mythology could not keep up with the times and were suddenly eliminated.
The three teachings of Buddhism, Confucianism, and Taoism climbed from piles of fellow corpses, competing mightily; they have theory, they have technique. What does witchcraft and Gu technique have?
Nothing.
Only when witchcraft and Gu technique are separated can some talks arise.
Witchcraft follows the high-end route, concerning national affairs and sacrifices, vying for the sacrificer's position.
