Well, when writing an alliteration scary story, you need to focus on the mood. If you want a story about a monster, you could start with something like 'The menacing monster made its way through the murky marsh.' You can use alliteration not just for the main elements but also for smaller details. For example, 'The monster's matted mane made it look more malevolent.' You can also use alliteration for the reactions of the characters. If there's a girl in the story, 'The girl gasped in great grief as the monster approached.' By carefully choosing words that start with the same letter, you can create a very effective and scary alliteration story.
To write an alliteration scary story, start with a concept. Let's say 'haunted house'. Then pick words that start with 'h' to describe it. 'The haunted house had a hollow hall and a haggard host.' Develop the plot using alliteration for actions too. For instance, 'The host howled horribly as he hunted the heroes.' Keep adding elements that start with the same letter to make it scarier and more engaging.