This story is a sequel to Best Hell Ever

Once upon a time, Twilight went to hell. It wasn’t that bad. It was pretty great, actually. It had a library! A big one. Like, bigger-than-the-universe big. But then Twilight went and got herself kicked out of hell, and now she’s depressed.

There’s only one logical solution: with Starlight’s reluctant help, Twilight is going to break into hell and invade its library. Oh, it’ll be tricky — trying to find one specific location in an infinite dimension tends to be a bit hard — but the infinite knowledge it’ll provide is too good to pass up. Twilight will find that library if it kills her (which, since this is hell, isn’t the worst thing ever in the grand scheme of things).

There is absolutely no way this can possibly go wrong.

Having learned much about Equestria from both Twilight Sparkle and Sunset Shimmer, the two principals from CHS have always been curious about what the world is really like. Luna finally proposes the idea that the two should find out themselves just what its like to be a pony...and not just any pony but royalty as well. What could possibly go wrong in this situation?

Twilight could probably name about thirty of them.

Starlight has a problem. Twilight left on an ambassadorial mission to the zebras less than a week ago. Just this morning, a businesspony showed up on the doorstep of the Castle of Friendship and stole the Alicorn Amulet right out from under her nose.

Rainbow Dash has a solution. Steal the Amulet back. How hard could it possibly be, right? Okay, so the Amulet's being kept in one of the most secure vaults in Equestria. And it's surrounded by guards and bystanders. And there's no one in Ponyville who has much experience in heists or robberies or law-breaking of any kind. Oh, and said businesspony is planning on selling the powerful artifact of dark magic on the black market, putting the whole thing on a time crunch. And they don't even have the blueprints to the place. But other than that, it'll be easy!

Starlight has a problem. This is the closest thing to a solution she has.

This can only end well.

Takes place before the season 6 finale.