Based on your query and the provided colors, I have created a color palette that expands upon the existing shades while maintaining a cohesive theme. Here’s the color palette with names, hex codes, and a description:

### Palette Name: "Deep Twilight"

| Color Name       | Hex Code | Description                                   |
|------------------|----------|-----------------------------------------------|
| Midnight Blue    | 
                            
                            #555aaa
                          | A muted, deep blue that evokes the calmness of twilight skies. |
| Dark Sapphire     | 
                            
                            #454aaa
                          | A rich, dark blue reminiscent of a deep ocean, blending beautifully with the midnight tones. |
| Charcoal         | 
                            
                            #222222
                          | A near-black charcoal that adds depth and grounding to the palette, perfect for contrasts. |
| Steel Blue       | 
                            
                            #3b5b8c
                          | A cooler blue with a hint of gray that harmonizes with the deeper shades. |
| Deep Slate       | 
                            
                            #4e4e4e
                          | A medium dark gray that enhances the overall sophistication of the palette. |
| Soft Lilac       | 
                            
                            #9a9bcd
                          | A gentle lilac that provides a soft contrast, lightening the mood while complementing the deeper hues. |

### Palette Description:
"Deep Twilight" captures the essence of a serene evening setting where the sky transitions from daylight to night. The palette features deep blues and rich grays, enhanced by a soft lilac that adds a touch of softness. This combination creates a perfect balance for designs that seek to evoke calmness, depth, and sophistication, suitable for branding, web design, or interior decor.