The Dark Sect was a very peculiar sect.
Their initial heritage came from Primordial Demons.
In fact, practice methods of mankind were passed down from various strong creatures that lived in primitive, ancient times, as well as the period of the Primordial Origin.
The power of the Dark Sect originated from Primordial Demons. While studying Primordial Demons, they also modified their powers accordingly to fit the body structure of men. At last, they created a set of power inheritance system that was suitable for human beings, and that was the source of the power of the Dark Sect.