The Dunwich Horror by H. P. Lovecraft
In the lonely, desolate and dilapidated village of Dunwich, Wilber Watley is Lavinia Whateley's ugly son, a crippled and unsteady mother of albino and an unknown father. (Alluding to the frenzied Old Whateley as "Yog-Sothoth"). Strange events around his birth and precocious development. Wilbur grew at an unusual rate that would reach manhood within a decade. Local people were disgusted with him, and families and animals were afraid and despised him. (Because of its scent) All the time, his sorcerer grandfather instilled him into dark rituals and witchcraft studies. Many villagers began to wonder after Old Whateley bought more and more cows, but his herd count never increased, and his field cows suffered from severe open wounds.
Wilbur and his grandfather occupied the unseen at their farmhouse. This creature is connected to yog-medicine, every year this invisible thing grows to enormous proportions, forcing both of them to make regular adjustments to their homes. People began to notice the trend of the cow mysteriously disappearing. Wilbur's grandfather died. His mother disappeared shortly after. The gigantic entity eventually occupied the entire farmhouse.
Wilbur made a joint venture with Miskatonic University in Arkham to provide a copy of the Necronomicon - Miskatonic's library is one of the few in the world to keep the Necronomicon manuscript. There is a spell that Wilbur can use to summon old people. But his family's copy was damaged and had no obligation to open the "door" when the librarian Dr. Henry Armitage refused to release him a copy of the university. (And by sending warnings to other libraries, hindering Wilbur's efforts to consult their copies.) Wilbur raided the library in the middle of the night to steal it. The alien-smelling guard dog Wilbur attacks Wilbur in an unusually ferocious manner and kills him. When Dr. Armitage and two other professors arrive on the scene, they see a semi-corpse. Wilber Watley's human before it was completely dissolved without any evidence left.
When Wilber Watley died, no one attended a mysterious appearance growing up in Whateley Farmhouse. One morning, Whateley Farmhouse exploded, and it was an invisible monster raging across Dunwich, cutting a path through the meadow. Trees and ravines leave "prints" as large as tree trunks. Eventually, monsters invaded the inhabited area. The unseen creature terrified the townspeople for days, killing two families and several police until Dr. Armitage, Professor Warren Rice and Dr. Francis Morgan gained the knowledge and weapons needed to kill it. Using the magic powder, it was visible long enough to shock one of the crew. A barn-sized monster cry for help in English before the spell destroys it, leaving a large burnt area. Its nature was finally revealed: It was Wilbur's twin brother, although it was. "It looks more like my dad than Wilbur did."
