How to find material for writing horror novels?

You can find materials from many places to write horror novels. Here are some ideas that may inspire you:

-Death: Death is one of the themes of horror novels. You can think about how to describe death, or how to make the hero face death.

-Ghosts: Ghosts are one of the common elements in horror novels. You can think about how to describe ghosts or how to make the hero interact with ghosts.

-Mystery novels: Mystery novels are also one of the common elements in horror novels. You can think about how to describe a mysterious event, or how to involve the protagonist.

-Mental illness: Mental illness is also one of the common elements in horror novels. You can think about how to describe mental illness or how to make the protagonist suffer from mental illness.