Twilight is happily walking down the hallways of her friendship castle, having on a bright smile.

Not ‘til at least appears coming out of her own horn comes a scroll.

A magical scroll that was sent magically, coming through her horn for some unknown reason.

“Huh. What’s this?” Twilight levitates the scroll up to her, opening it up to read it:

My dearest Twilight.

Us, both Princess Celestia and Luna, immediately ask for you and your friends to come to Canterlot IMMEDIATELY. We will explain later. Just get here. NOW!

Signed your former mentor,
Princess Celestia

Twilight didn’t hesitate just the slightest as she starts running as fast as she could.

Author's Note

Basically you could say a prologue to all of season 9 actually that I wrote but isn’t canon.