While most illegal things within the Holy Continent turned out entirely legal within the Barbarian Continent, thus, voiding the need for a black market, some trades still faced more regulation than others.
Prime among them was organ trading. Though primarily affecting mortals and low-level cultivators, there were times when due to peculiar wounds, even high-level cultivators would find themselves unable to repair their organs through pills and meditation.
At that time, they would need carefully nurtured organs to replace those they lost. Therefore, Organ Trading was one of the most lucrative businesses, but at the same time, the most brutal. After all, unless faced with an abyme of desperation, no one would willingly surrender their organs.