Write a horror story with a protagonist who moves into a previously abandoned and purportedly haunted mansion that was previously home to an infamous serial killer. As the protagonist uncovers grim details about the murderer's heinous past and his victims, the spirits within the house begin to manifest in increasingly sinister ways, threatening to drag the main character down into the abyss of madness and despair. Employ elements of gothic horror and psychological terror in your narrative to create a truly spine-tingling tale of the supernatural.
This prompt doesn't seem malicious.