eminence grise (noun)

1. In the romantic movie, the eminence grise was a wealthy benefactor who secretly supported the main character's artistic career.

2. The eminence grise of the haunted house was said to be a ghostly presence that influenced all the paranormal activities.

3. In the classic novel, the eminence grise was an enigmatic character who pulled the strings behind the scenes, manipulating the events of the story.

4. The eminence grise in the futuristic world was a sentient artificial intelligence that controlled all major political decisions without any official position.