Here is the updated color palette with Royal Purple positioned as the second color, while maintaining the order from lightest to darkest:

json
{
  "palette_name": "Adjusted Transition from Lightest to Darkest",
  "colors": [
    {
      "name": "Amethyst",
      "hex_code": "
                            
                            #9966CC
                        "
    },
    {
      "name": "Royal Purple",
      "hex_code": "
                            
                            #7851A9
                        "
    },
    {
      "name": "Medium Purple",
      "hex_code": "
                            
                            #9370DB
                        "
    },
    {
      "name": "Purple Heart",
      "hex_code": "
                            
                            #9B59B6
                        "
    },
    {
      "name": "Rebecca Purple",
      "hex_code": "
                            
                            #663399
                        "
    }
  ]
}

In this palette, Royal Purple is now the second color, creating a new arrangement while still highlighting the transition from light to dark.

Would you like to make any further adjustments or explore how to apply this palette?