Nightmare Moon was always the villain right? Just remembered to scare little fillies when they disobeyed? Now that old mare's tale is back and does she have things to tell! And with Celestia on the sun the ponies can't do anything but listen.........

Rainbow meets Fluttershy's cousin and her friends only to find she knows them all already.
And one of them isn't very happy to see her.
Lightning Dust has given up on anything hopeful and although her brother and friends try to help her she doesn't think that there truly is a thing as True Happiness...

Luna is not the only pony to have a Nightmare inside her, In fact all ponies do. that anti-conscience, The devil on your shoulder if you catch my meaning. Sometimes it is very apparent, it comes out sometimes when a pony is sad or upset, Pinkamena for example.
But this story isn't about them, This story is about your cherished Princess Celestia and her dream that started a chain of thoughts that nopony will ever disregard as meaningless.
An Alicorn's mind is a precarious thing with so much power it's a wonder that it doesn't go to their heads, or does it?