From Equestria to a world where unicorns are hunted and killed, Rarity's friends rush to her aid, only to find themselves quickly enmeshed in a great war. It is a world where Equestria fell apart in its early days, Hearth's Warming never happened, and an eternal winter night blankets the land under a permanent sheet of ice.

The Order of the Hatten Vanguard vindictively hunts unicorns and rules its citizens with an iron hoof. They claim that their ruthless tyranny is necessary for the survival of ponykind against the cold, and that only the extermination of all the unicorns will starve the winter of the magic that fuels it, and they may be right.

The Ceruleans claim The Order must fall, that its cruel reign is what brings the winter.

Both sides are willing to fight to the bitter end to bring the summer sun.

The world is a tapestry of the lives and deaths of heroes and villains on both sides, of leaders struggling to know what course will bring their dawn, of powerful secret societies with mysterious and ambitious goals, and where unthinkable new technology threatens to change the world forever. It is a world in turmoil, and a world in need of heroes of every kind.

It is a world apart from Equestria.