Color Palette:

1. Color Name: Midnight Black
   Hex Code: 
          
          #000000
       
   Palette Description: A deep, dark black color resembling the eerie darkness of the night, perfect for creating suspenseful and mysterious illustrations for a horror story.

2. Color Name: Ghostly White
   Hex Code: 
          
          #FFFFFF
       
   Palette Description: A pure, ghostly white color that represents the pale complexion of supernatural beings, providing a chilling contrast to the darkness and adding an element of fear to the illustrations.

3. Color Name: Haunting Purple
   Hex Code: 
          
          #800080
       
   Palette Description: A haunting purple shade that invokes a sense of supernatural presence, often associated with ghosts or otherworldly entities, ideal for creating a spooky atmosphere in the illustrations.

4. Color Name: Blood Red
   Hex Code: 
          
          #FF0000
       
   Palette Description: A vivid, blood-red color that symbolizes danger and horror, commonly associated with vampires, monsters, or gruesome scenes, adding a thrilling and intense element to the illustrations.

5. Color Name: Ghastly Green
   Hex Code: 
          
          #00FF00
       
   Palette Description: A ghastly green color reminiscent of toxic substances or eerie glows, ideal for depicting eerie landscapes, haunted forests, or glowing creatures in the illustrations, evoking a sense of unease in the viewer.

These five colors create a chilling color palette suitable for illustrating a horror story for pre-teens, allowing for the creation of suspenseful, mysterious, and spooky scenes that will captivate readers and immerse them in the eerie atmosphere of the story.