This is a story of Luna's fall and how it came to be. After all these years of disappointment form her subjects. A pony shows up, promising Luna that if she lets her help. Her people will adore her for all the years to come.
I have had a head cannon that Luna was not fully in control of herself while she was Nightmare Moon.
LOVED IT
Tip - make Luna's speech a different color from black so readers can follow what's going on better
8097727 OK noted. Never really thought of that.