Princess Celestia had been a lot in her long life: A mentor, a ruler, a sister and to some even a goddess. But she had also been a warrior and conqueror, someone who has created much pain and sorrow. All that guilt for her past actions and her anger for being unable to correct her mistakes are eating up the princess from inside.

She fears what might happen to her if she succumbs to the regrets she buried nearly a thousand years ago. Those regrets that whisper to her every night and tell her to finally stop caring and holding back. Before going crazy, Celestia decides to come clean to the one person she knows will treat her with kindness. But is it already to late?

Meanwhile princess Luna discovers a terrible threat to not only Equestria, but the whole world. Monsters from thousands of years ago have returned. Creatures so evil and terrifyingly powerful that even the combined might of the Elements and the princesses of the sun and the moon will not be enough to stop them. (Humanized Ponies!)