This story is a sequel to Into The Depths

The horrors of the catacombs have turned to distant memories for Celestia, Twilight, and Luna. Discord’s change of heart and Twilight’s coronation have helped to ease and erase the mental scars from that harrowing night. The three princesses can even smile and laugh as Nightmare Night moves into full swing.

Yet, it should never be forgotten that those who have been touched by Tirek are forever within his grasp.

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?

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

Caught in the middle of a struggle between Equestria and a neighboring country, Blueblood finds himself alone in unfriendly territory. Through trials and hardships he finds himself under the wing of a veteran soldier, and the arrogant, spoiled stallion begins a slow metamorphosis into the prince his country needs.

Twilight's spell to return Dashie and her friends back to Equestria failed! Now Rarity is lost and alone in the human world. She worries about her friends, not knowing if they made it back to Equestria or not. But first she must fend for herself in the human world, lucky for her she finds a human friend to protect her. the story takes place from rarity's human friend's perspective. Rarity makes a huge impact on the life of her human friend, but will she make it back to Equestria?

You could say this story takes place in the same "Universe" as "My Little Dashie."
The ponies seemingly teleported back to Equestria at the end of My Little Dashie, but what if the spell actually failed, and the ponies were merely sent elsewhere in the human world?

Hoping to make a story like this for each of the mane six

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Cover image is by Kawiko:
http://browse.deviantart.com/?q=rarity&order=9&offset=144#/d4kd28c

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2