Any way that goes to the extreme violates humanity is characterized as the demon way. Throughout history there been several demon giants. They all had a fiend in their titles. Each one because of their way fall before they could go further. This is called karma. Even reincarnation didn't accept them. Their souls remained eternal. Their inheritance and souls drifted for an unknown number of years in space. Coincidencely, they prepared a way for their inheritance and most powerful cultivation method to remain. Before dying, they got together and prepared a jade pendant. When each one died, all it went in there including their souls. Demao dao resources was also in it. It landed on a mortal plane. A young man who was a beggar found it. Through the demon dao giants souls, he got their memory. He combined their signature cultivation method and created a new one. It exceeded immortal level. Then, a peerless unique devil was born.