One word could be 'nightmarish'. It's like the story is a nightmare come to life. It can involve all sorts of terrifying and surreal elements. Another useful word is 'unnerving'. It takes away your sense of comfort and security. And 'dreadful' which simply means full of dread or great fear.
Grim, because it gives a sense of being very dark and unpleasant. Macabre, which implies a fascination with death and the grotesque. Eerie, as it creates a feeling of unease and strangeness.
Terrifying, spine - chilling, and macabre are good words to describe a horror story. 'Terrifying' emphasizes the extreme fear it can induce. 'Spine - chilling' gives the sense that it makes your back shiver, like a cold feeling running down your spine. 'Macabre' is more about the grotesque and disturbing elements often found in horror stories.
There are also 'draw and straw'. 'Draw' rhymes with 'horror' and'straw' rhymes with'story'. In a horror story, perhaps there could be a scene where a character has to draw straws to decide their fate, which shows how these rhyming words can be imaginatively connected to the concept of a horror story.
In the old house, I heard a baby's cry. I followed it to the attic. There, a doll stared at me, blood on its porcelain face. I ran, never looking back.
There was an abandoned house at the end of the street. One day, out of curiosity, I decided to explore it. As I entered, the door slammed shut behind me. I heard strange whispers echoing in the empty rooms. I walked into the living room and saw a rocking chair moving on its own. A chill ran down my spine. Suddenly, a figure in white appeared in front of me. Her face was pale and her eyes were hollow. She stared at me for a moment and then let out a blood - curdling scream. I tried to run but found myself trapped in the house with this terrifying apparition.
Corey and hoary are words that rhyme. The vowel and consonant combinations in these words match up with story and horror. Also, maybe gory could be considered a rhyme, depending on the context and pronunciation.