I've Become an Immortal, the World's Gone Mad

Reader advisory: This book contains mild horror, and the protagonist has a split personality. No cheats, no female lead. There may be heartbreak, but I swear it isn't deliberate. Here's the real synopsis: Chen Lu finds a strange book among his father's belongings and inexplicably transmigrates to another world. No big deal. Transmigration is a minor problem. But Chen Lu doesn't have all of his predecessor's memories of this world. No big deal. Amnesia is a minor problem. What he never expected was that something was terribly wrong with this world: terrifying ancient gods watching from beyond, powerful beings that are one of a kind, and bizarre cultivation techniques and immortal arts. Chen Lu: I want to go home.