If you had access to a portal to a universe filled with ponies, would you go? Rarity wants to sneak across; Drama Letter accidentally fell in. And while Rainbow Dash is fascinated by her wings, Flash Sentry wants his clothes back!
And of course, if pony Lyra is apparently fascinated by humans, wouldn't human Lyra be fascinated by mythological ponies?

A year after the Battle of the Bands, high school graduation is nearing and the girls are ready to face the world, though Sunset Shimmer worries that they might drift apart. But when Twilight's human self arrives and ends up getting infected with dark magic, they must call upon Princess Twilight once more to engage in a battle that will decide the fate of their worlds.

Tagline: A Duel of the Duplicates

BTW this is how I thought the third Equestria Girls movie was going to go.

Covert Art done by Eveyann.

This story is a sequel to Blood Moon

It's been two and a half years since the battle between Celestia and Luna took place. So bloody and fierce, but never written into Equestria's history. Twilight however, saw something amazing in that clash of these celestial titans:

A whole new sky had been created from the destruction.

Twilight, so entranced by it, recreated it, only making a few changes to it. She shared it with the citizens, who fell in love with Twilight's newest and greatest form of magic and art. Celestia however, disapproves of this creation, and in doing so, has begun the birth of one of Equestria's greatest enemies that it will ever know.