"Four prophets rise up. Four cardinal points in the compass rose. They will show the way beyond the light of the sun, the moon and the stars. They are the word, the secret and the reason for all the evil that must be and have to be done. We are oblivion, we are dust and nothing else. Suffering is our ally, suffering is our life. Famine, war and death are indifferent to the weak and powerful. Victory. This world must perish. This world must reborn... The story must be told. Our time has come.

Equestria's peace is at the stake when an ancient organization rise up from the shadows of past, spreading their word and making their move. Can Twilight and her friends defeat this new threat? Or is it something that the magic of friendship cannot defeat? Maybe is too late, a thousand years late.

MLP:HoC take place right after season 8.