Here is a color palette that starts with Medium Purple and transitions to darker shades:

json
{
  "palette_name": "Gradient from Medium Purple to Dark",
  "colors": [
    {
      "name": "Medium Purple",
      "hex_code": "
                            
                            #9370DB
                        "
    },
    {
      "name": "Rebecca Purple",
      "hex_code": "
                            
                            #663399
                        "
    },
    {
      "name": "Purple",
      "hex_code": "
                            
                            #800080
                        "
    },
    {
      "name": "Dark Orchid",
      "hex_code": "
                            
                            #9932CC
                        "
    },
    {
      "name": "Dark Violet",
      "hex_code": "
                            
                            #9400D3
                        "
    }
  ]
}

This palette begins with the vibrant hue of Medium Purple and deepens into darker shades, creating a rich gradient effect that can be used for striking designs.

Do you have any specific applications in mind for this palette, or would you like to adjust it further?