King Sombra and Princess Celestia have a heart to heart about how far they are willing to go.
As an aside, I always thought it was a mistake not to explore the question as to what you do if you don't have all six, at least while it was an option. Anyway, I need to get back to posting these more.
SPECIAL APPEARANCE BY
Twilight Sparkle
Princess Celestia
GUEST STARRING
King Sombra
Manablade aka meioubunny