The Drakenhof Nightshade color is a dark blue wash that you can use for Nightlords, Ultramarines or other blue-colored armies.
The Games Workshop Shades are used to add shading and depth to your pre-painted models. After you have applied the base colors, you can spread the shade generously on the dry color, the shade is so liquid that it flows into all the indentations and dries there. In raised areas, you should remove the shade in good time with a wet brush or cloth to avoid unsightly stains on the model. The model can then be further processed as desired, e.g. by dry brushing with drybrush colors or highlights with layer colors.