In the world of Earth, the Levantine Assassin Brotherhood has struggled against the Order of Knights Templar in order to protect humanity from subjugation at the hands of their adversaries. For generations, paragons such as Altair Ibn-Alahad, Ezio Auditore da Firenze, Connor and Edward Kenway, and Arno Dorian and lived and died for this seemingly eternal war, fought in the shadows.

Now, they are all deceased. But they are not yet finished. A mysterious Precursor known as Faust brings these legendary Assassins to a world known as Equestria. However, this realm is not one of magic and harmony, but one of gowns, balls, and the endless search for power. However, the Assassins are not alone in their coming to this world. For the Templars have also made it to this realm, and will do anything to see it fall under their control.

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Flash Sentry, son of Count Aegis Sentry, seemingly had everything he would need. Wealth, power, weekly meetings with the newly coronated Princess Twilight Sparkle...it looked like his future was set in stone. Until his father's mysterious murder in the middle of the night, and Flash is framed and convicted of the crime, despite his complete innocence. Betrayed by all but a few of his close allies, he awaits his execution. In a twist of fate, he is rescued by otherwordly beings and drawn into a war that will decide the fate of two worlds and their history forever.

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Victorian Era/French Revolution-style AU Equestria crossed over with the Assassin's Creed series through AC: Unity. Will have gore, swearing, and plenty of violence, with possible implied sexual content.