Chronicles of the Demon Hunt

I Bowed Before the Demon for Three Thousand Years, Then Turned Back to the Mortal World and Forsook Immortality

Any novels where the male lead falls into demonic madness?

Decisive and Ruthless: I've Fallen into Demonic Ways

Decisive and ruthless, embracing the demonic path and rejecting Buddhism.

The Protagonist Cultivates Demonic Arts, Has a Demonic Physique, and White Hair

Mortal-Focused Stories, No System, Demon Cultivation, Please

A Record of a Mortal's Journey to Immortality, Demonic Cultivators, Comedy, and a Little Spice?