Loss. Everyone goes through it, and Princess Celestia is no exception. Over her long life, she has lost many family members and friends.
It is during these moments of heartbreak that a mysterious stranger appears. He doesn't stay for long, and doesn't say much, but he has been there every time Celestia loses someone important.
Who is he? Why is he there? And why is it that Celestia is the only one who can see him?