Douluo: the Devil Is Reborn, the Goddess Helps Me Practice

Cao Yanqing traveled across the Douluo Continent and was accepted as a disciple by Queen Liu of the Tiandou Empire. After being trapped on a deserted island while hunting for souls, Cao Yanqing awakens the memory of his past life. It turns out that he was a demon in his previous life. Is there no aura in this world? It doesn't matter, I have the Ten Thousand Souls Banner! Isn't this physical qualification good enough? It doesn't matter, I have a great way to practice Qigong!