Possible Clues:

• Like an overcast night
• Black, as the night sky
• Black ships initially without crew?
• Like stormy nights
• As overcast nights
• Nothing over you for the knight, by the sound of it
• Like The Sky At Night, sometimes, with nobody famous appearing
• It's not clear if it's the night sky
• Like a dark night, perhaps
• How rats return minus this when it's dark