With the timeline saved from Starlight Glimmer's meddling, Twilight thought Equestria might finally be safe for a time. However, when she found an oddly familiar stallion unconscious at the edge of the Everfree Forest, Twilight knew that something was about to happen. The situation became strange when the stallion awoke, and recognized her... but otherwise claimed to have no memories beyond his name.

Sombra.

Confused as to why the ancient tyrant knew her name, was so near her home, had lost his memories, or was even alive, for that matter, Twilight decided to bring him back to Ponyville so that she could keep an eye on him until she could get some answers.

Returning home only brings more questions, however, as Twilight finds the town under attack by the undead, the monsters falling from a massive portal in the sky. Quickly joining up with her friends, Twilight struggles to fight off the undead, surprised when Sombra joins in the defence of her hometown... alongside a cloaked pony that came through the same portal as the monsters

Undead attacks, threats of war, and a mysterious figure. Twilight and her friends find themselves once more the only hope for Equestria, as they fight against fate to prevent the revival of the dread beast Grogar...

Based on Fire Emblem: Awakening.