During the war against the evil Caribou Nation, Equestria found themselves on the precipice of conquering their dark foe. But in a desperate gambit, the Caribou Nation activated a series of new weapons: magical weapons of mass destruction. Theromagical warheads that could obliterate a city and leave its inhabitants as blocks of carbonized flesh. Biomagical weapons that can choke an entire city of life. In one, savage attack, sixty percent of ponykind is wiped out. The Princesses, injured and broken, captured and enslaved, impaled alive in front of their subjects or trapped in cages to watch the mass execution of their ponies.

For twenty years, Twilight Sparkle has watched her home die around her from the inside of her cage. Twenty years alone with her genius mind. Twenty years to think about magic. She has a plan.

Now, with an army of vengeful, undead ponies at her back, can Twilight retake all of what was lost? And more than that... can she restore Equestria, or will she truly be the Queen of the Damned?