Nightmare Moon.

The name still haunts Luna, still follows her in everything she does. Ponies are too scared to look her in the eyes, her guards are constantly uneasy, and worst of all...

Worst of all, Celestia refuses to keep her company at night, in the way she used to.

Luna has tried everything to put the ponies at ease, to convince them that she's no longer the Nightmare they're so scared of, but nothing has worked. If anything, her efforts have only made everything even worse. Celestia has a new plan, though, one she's sure will sway the hearts and minds of their subjects. An old, forgotten tradition. An eclipse.

All Luna has to do is trust her.