The World Is Out of Whack, and Every Sect Is Full of Evil God Worshippers!

Looking for Weird Fiction About Contamination, Not Rule-Based Horror

I've read too many stories centered on rules. I want to try one focused on contamination.

Any Stories Where the Protagonist Is an Old One?

The protagonist transmigrates as an Old One and knows that he's an Old One. Lovecraftian horror.

Mutation, Distortion, Cthulhu, the Old Ones, a Dark World

Evil Gods and Immortals... Eldritch, Unknowable Cthulhu-Style Gods and Ethereal, Boundless Immortals...

An evil god and an immortal, opposed to each other, with two factions.

I Am the Divine Being's Most Fanatical Believer

Of course, I am a god too.

An Invincible Male Lead Who's Not Quite Right, Like Being Mentally Ill

I'm Crazy! Give Me Something Like My House of Horrors or a Story About a Madman

Listen up, you lot: this novel is a con spun by the Zuowang Dao. Mine is the real deal. Li Huowang was jolted awake by the rocking carriage. He turned on the light, placed the Zhuge Sword beneath his pillow, and sat up. He saw Bai Lingmiao push open the ward door. “It's so late, and you still haven't…”

Books with Unhinged Protagonists

Looking for books similar to *I Have Delusions, but I'm a God*. The protagonist has delusions and crazily builds a harem while trying to save the world.