An alternate Mane Cast cross over into the normal Equestia, things go down hill from there.

Almost a year has gone by for Harry Dresden since he left Equestria. Then he receives a strange letter from Twilight. He's glad to return, but dark rumors have spread since his first visit. A sequel to The Dresden Fillies: Strange Friends.

So like, this pony and I met in Hell, and we totally kicked ass together. Also there's a hot chick

The name of a book causes some concern among Sunset's friends.

[NOW COMPLETE][Sequel Published] Twilight and Luna uncover some of Celestia's hidden secrets as they explore their budding relationship

Twilight finds a word she doesn't know in a book. The only problem is that it isn't in the dictionary, and every time she tries to say it, a bleep is heard and a black box appears over her mouth. She eventually goes insane.

Sunset Shimmer spends an ordinary afternoon and evening at home.

Aria's friends attempt to find her some "companionship"

A young Cadence walks into foal sit for her favorite charge only to find that...

Vinyl Scratch walks into a bar. There is no punchline.