When Applejack is set upon by a series of unnatural nightmares, she turns to good friend and confidant Pinkie Pie to try to figure out exactly what's causing them. Day after day they struggle to learn the skills that will allow her to make sense of it all, as they discover what is needed to walk the realm of dreams.
And as time goes by, the clearer the picture becomes.

But still it remains - the mystery and the clues that lay scattered across her nighttime episodes where words do not exist, only to be analyzed during the day where conversation is all she has.

Join Applejack and Pinkie as they work it out together and traverse a story where nothing is ever as it seems.

To save her sister and her faithful student, Celestia herself must travel into the ancient tunnels beneath the ruined castle in the Everfree Forest. She, and the guards who accompany her, must face the dark, twisting corridors. Still, what was Luna and Twilight's purpose at the old castle? Why were they unable to return of their own accord?

And what watches Celestia from beyond the light's edge?

There are stories which define us. Stories that inspire us. And there are stories that damn us.

These are the Old Stories, tales from before the dawn of Equestria.

Spanish translation

The original EqD link is here: http://www.equestriadaily.com/2011/08/story-old-stories.html

Princess Celestia tires of constantly being surrounded by decorum, deference, and formality, and decides to take a day off from being Princess. But visiting Ponyville incognito is harder than she expects. Will she be able to fit in and make friends without blowing her cover?

To Twilight Sparkle and Princess Celestia, it is a simple surprise visit to Canterlot. To the ponies of the Equestrian Civil Service, it is twenty-four hours of chaos, politics, weaponized dessert, politics, underhooved manipulation of media, politics, and things batrachian and tentacular. Who said bureaucracy isn't exciting?

The world spins, years pass, and everything comes to an end. Except Celestia. She sits on the shore of the last ocean, watching and waiting for her own chance at death. Because everything comes to an end if you wait long enough, and Celestia is patient indeed.

If you think that your day is a little too short,
With too much to do for twenty-four hours,
Then you fall back on the final resort,
And go back in time with your magical powers.

Princess Celestia, in her infinite wisdom, comes to the conclusion that she doesn't have anywhere near enough time to do everything on her busy schedule. Not a problem for her, though. The solution to having no time is obvious: just make some more.

This story is a sequel to The Moon Glows Gently

When you're the immortal ruler of an entire kingdom, the most important quality to possess is self-control. No princess can rule her nation if her emotions rule her. Celestia knows this better than anypony, and mastered them long ago.

So long ago, she may have forgotten that a little bit of passion can come in handy now and again.