Five Hundred Years Ago? This Time, I'll Become a Fiend!

My name is Chen Qing. In a secret realm, I inherited the legacies of two ancient demon lords, the Heaven-Swallowing Demon Lord and the Slaughterdust Demon Lord. When the secret was exposed, disaster struck in an instant. The senior brothers and sisters who had once fought at my side in pools of blood and sworn to walk the path to immortality together turned around and stabbed me in the back. The righteous sects of the world swarmed to hunt me down, slandering me as someone tainted by demonic power and fallen to the demonic path. They spoke lofty words of righteousness, claiming they were acting to protect all living beings and vanquish evil. How laughable. What is righteous, and what is demonic? They are nothing but rules written by the victors. If the world has no place for me, if treating others with sincerity brings nothing but betrayal and slaughter, then in my next life, I'll become the demon who throws the world into chaos! I won't care about right or wrong, only what I stand to gain or lose. I'll prey on the weak, be ruthless and cold-blooded, and never show anyone an ounce of kindness again! As I lay gravely wounded, I detonated my Nascent Soul. In my final moments, a voice asked, “Are you willing to fall to the demonic path?” The intense pain faded. When I opened my eyes again, I was lying in bed. This was five hundred years in the past. I had really come back! Inside my dantian, a three-inch black Nascent Soul was covered in countless cracks. It was broken and feeble, but still alive.