A Letter From Another World

This letter was found on one of the library desks, haphazardly placed, as if having fallen from a short distance. The date on the letter indicates that this letter was dated a day after Midnight disappeared from this world. How this letter found it's way to this world is a mystery that might never be truly solved.

The letter, in it's entirety, reads:

Dear everypony,

I'm okay.

I'm home.

I'll never forget any of you.

-Midnight