Here is a color palette designed for a GHW Fandom wiki in dark mode, incorporating your specified colors:

json
{
  "palette_name": "GHW Fandom Wiki Dark Mode",
  "colors": [
    {
      "name": "Community Header",
      "hex_code": "
          
          #8BC8FA
       "
    },
    {
      "name": "Article Background",
      "hex_code": "
          
          #301934
       "
    },
    {
      "name": "Accent Color",
      "hex_code": "
          
          #9C27B0
       "
    },
    {
      "name": "Sticky Nav",
      "hex_code": "
          
          #5E35B1
       "
    },
    {
      "name": "Link Color",
      "hex_code": "
          
          #BA68C8
       "
    },
    {
      "name": "Community Background",
      "hex_code": "
          
          #1A001A
       "
    },
    {
      "name": "Community Text Color",
      "hex_code": "
          
          #D1C4E9
       "
    }
  ]
}

This palette features a vibrant community header color, complemented by darker hues for the article background and community elements, ensuring good contrast and readability in dark mode.

Do you have any specific elements or features in mind that you would like to enhance further with this palette?