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.

When an unknown meteor shower descends upon Equestria. Seven meteor's crash at different points in the magical land. Princess Celestia informs the elements of harmony that it is a sign that an old prophecy is coming to pass. As the six begin their journey, they discover that each meteor holds a pony who claims to have never seen Equestria before. The first one which crashed in Ponyville holds the gentlecolt calling himself, Jonathan Joestar. They all soon realize that they must gather the remaining stallions in order to avert a catastrophe of biblical proportions.

"There will come a time, when seven stars fall. Upon this day, a bizarre journey must take place to gather them together. For the evil they herald possesses powers unlike any other, sono chi no sadame!"

A flip of a coin. A twist of fate.

Twilight Sparkle, younger sister of Princess Celestia's personal student, Shining Armor, grew up listening to her brother's bygone dreams of joining the elite of the elite: The Royal Guard.

Now, fresh out of the Academy, this young mare is ready to prove herself equal to the deeds of the great soldiers she read about as a filly. Too bad the princess she ends up protecting isn't Celestia.

Mis-communication has started many a war, but in this case maybe calling it a war was too generous.

The "war" is over, Twilight has successfully orchestrated a bloodless end to the Griffons' aggression, but only now does she realize that there is more to winning than she had first assumed, especially against a nation that holds war as a central part of their culture...

Now Twilight must deal with the aftermath while facing a challenge she never anticipated: being seen as a conqueror.

This can be read alone, but I recommend reading the letter that started it all for a chuckle and a little exposition. This series of expositional one-shots can also give some additional world-building.

In response to threats of a griffon attack on Equestria, Twilight responds with a letter detailing just why such actions would prove unfavorable for them.

Princess Twilight sets up a war game for the Royal Canterlot and Crystal Empire guards. By kidnapping Luna and Cadance.

The guards thought she knew the rules. They thought she knew the guard manual backwards and forwards.

Sweetie Belle, Scootaloo, and Apple Bloom re-write the manual... and conquer Equestria.

Edited by Noble Thought.

Cover art: Princess Predicament by radiantrealm

One hundred percent approved by Twilight's Library (also approved by Discord).

One beautiful morning, Twilight Sparkle decides she wants a free salad. After a small amount of theft, assault, battery, and arson, she sits down to enjoy what is sure to be the best tasting salad ever.

...Or she would have, if it weren’t for the Equestrian Intelligence Service locking her up as a potential threat to national security. Now, Twilight must escape a maximum security holding facility hidden deep underneath Canterlot. And to do it, she’ll need a paperclip, a spymare catsuit, an escape plan, and an alliance with the dastardly Drakbog, King of Frogs.

Princess Celestia went out for a stroll to a coffee shop. The next morning, she is single-hoofedly destroying the coffee industry.

How?

No really, how?

Fashion shifts fast-forward for Rarity one fateful summer day. It's the day that her four future selves, each carrying a magical time amulet, show up in her studio! But will her destiny, her sister Sweetie Belle’s destiny – and the future for all Equestria for that matter - be irrevocably changed by what they tell her?

Update: Wow, put in 'Featured', 'Twilight's Library', and 'Celestia's Library'! I am honored.
Update to the Update: I'm on Equestria Daily? I am honored and flattered!!
Update to the Update to the Update: Youtube Video review by Strebiskunk!
Update to the Update to the...oh, you know the drill by now: 'Time Enough' has just been added to the elite 'Royal Guard' group of stories, huzzah!

Discord has lived for quite a long time. Centuries as a ruler, a millennium as a rock, years as a reformed draconequus, it all gets very tiring. A nap is exactly what he needs. But when you live forever, time loses its meaning, years pass in the blink of an eye, mortals come and go like mayflies. And that's fine.
After all, any being that is truly important will live forever. Discord would never associate with anything less.