The Night Audrey Suffered from Morning Sickness, Amon Handed Me a Monoclesecret

The Only Lovecraftian Novel Worth Reading Is Lord of the Mysteries! Disagree? Come Debate Me!

I've been reading for over ten years and have had a long-lasting book drought. After rereading Lord of the Mysteries, I'm looking for a million-word-plus Lovecraftian novel with sequences, advancement, and potions, but I've had no luck at all...