[Single female protagonist + cool writing + demon-falling + invincibility + training + decisive killing]
More than 800 years after the demon-slaying war, the mainland of China is corrupt and chaotic, and the people are living in dire straits. The people at the bottom are being oppressed and bullied. Since the laws of heaven are unfair, I will become a demon and kill all the gods and Buddhas in the sky. Now that good and evil are blurred and loyalty is indistinguishable, chaos will break.