What had started out as a relatively normal day for Twilight Sparkle quickly became the day that everything changed for all life on the planet Equus-G4.

For it was on that day the Galactic Empire arrived, with only one single purpose.

Conquest.

Despite the best efforts of Princess Celestia and the Royal Guard, Canterlot fell, unable to stand against the technological superiority of the Empire.

Princess Celestia herself, the Light of Hope for Equestria, fell to the hands of the Sith Lord, Darth Vader, her public execution broadcast across the kingdom.

But it was also the day that 10 year old Twilight tapped into a mysterious power, one that nobody on Equestria had ever seen or heard of before.

The Force.

After spending five years hiding from the Imperial Forces, surviving by stealing from their convoys, she finally scrapes together enough credits to buy passage from a smuggler to another planet.

There she meets Sunset Shimmer, a fellow Equestrian who reveals herself to be a Jedi Knight and a survivor of Order 66.

And together, they set off on an adventure that will help change the galaxy forever.

Meanwhile, Darth Vader discovers another Equestrian who's Force Sensitive. One whose anger makes her a perfect candidate for the Inquisitors.

And perhaps, something more...

Before the five year timeskip, this story starts roughly 10 years Before the Battle of Yavin, or 10 BBY.
AKA, ten years before Episode IV: A New Hope and nine years after Episode III: Revenge of the Sith.
Death Tag is for the aforementioned death of Princess Celestia, and many members of the Royal Guard that forgot to wear their Plot Armor.
Gore Tag is for dismemberment and decapitations via Lightsabers, Vibroblades,
and a few other creative tools.
I don't think I need to explain the Violence and Profanity Tags. This IS Star Wars after all.