=====Originally Posted Dec 2011====EQD Link=====
The arrival of a new "Star Buck's Coffee" in Ponyville is putting the pressure on Sugarcube Corner. The Cakes worry they'll soon be forced to say 'goodbye' to their bakery, until Pinkie Pie discovers a sugar-craving plant. Is this bizzare vegetation the bakery's saving grace, or will Pinkie Pie find it's growing appetite too much to handle?

A greedy corporate baron, a ravenous plant, musical numbers, and romance. Three of these four things are in this story, and since there's no shipping tag, you only get one guess.

Story is author-rated to be approximately PG (Nopony gets eaten or anything like that).
WARNING: This story features links to songs on YouTube. They will play when you click the link.

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?

There has always been a little voice in Twilight Sparkle's head, whispering dark musings to her. And until her brother's wedding, she has managed to push those bitter thoughts away and focus on the good. She forgives and forgets and holds onto hope.

But when her friends turn their backs on her and her brother cuts her from his life, Twilight finds herself alone, with only the little voice to comfort her.

And it is through anger and hate that has been repressed for so long that Twilight finds the power to rise up. Harmony and Friendship have only brought her pain and suffering. It is time for her to embrace her dark side. No longer will she worry about what others think. Twilight is going to live her life how SHE chooses: without friends, without family, without love and without harmony. She is going to cut loose, have fun, and screw what others think.

For her friends and family, it will soon become apparent that if they don't find a way to mend the damage they've done to the lavender mare...Twilight Sparkle might be lost to them forever.

Thank you to everyone that got this story as one of the Featured Stories here on the site!

The TvTropes Page can be found here: http://tvtropes.org/pmwiki/pmwiki.php/FanFic/FaithAndDoubt

Cover created by the amazing FerGarcia220

Twilight Sparkle finds a book in the library.

Twilight Sparkle reads aforementioned book.

Twilight Sparkle's life is thrown upside down, her view of her teacher shattered, and her friends pitted against each other.

Everything will return to normal.

One of these statements is false.

Right before the big Canterlot Wedding, Twilight Sparkle makes a 'false' accusation against 'Princess Cadence.' Abandoned by her friends, teacher, and brother, the heartbroken pony experiences conflicting feelings of guilt and anger. Seizing this opportunity, Chrysalis takes in the fragile unicorn as her protege for her plan to plunge Equestria in darkness and chaos. With the Elements useless and the world being torn apart, how can Princess Celestia and the Elements possibly undo the damage they could've so easily prevented? And will Twilight be able to push away the darkness, or lose herself to it?

Note: Alternate Universe because of a few....'secrets' certain characters have, as well as obvious other reasons.

Princess Celestia, the princess (or Technical Queen) of all Equestia, is a seemingly happy and calm benevolent ruler of Equestia, and happily respects the opinions of her subjects. She's not even bothered by the crude rumors of her being a tyrant, a molester, or even the unfortunate nickname of "Trollestia." However, she does have a great deal of personal pain that even Twilight Sparkle has thought to be long dealt with. Celestia is still sad that she banished her sister to the moon when she was Nightmare Moon, intending on turning her back to normal. Though that is long since dealted with by her redeemer, Twilight, Celestia is still saddened by it, which makes her vulnerable to a treacherous spirit of Nightmare Moon, now a shadowy nightmare demon ghost, who tricks Celestia into believing that Nightmare plans to create the Elements of Disharmony with five ponies (and a griffin) in contrast to her student and her friends. Celestia, falling for it, goes on an innocent, but blind hunt for those who are contrasts of the Elements of harmony, not aware of the Nightmare spirit's true intentions. (Spoilers for following chapters not intended.)

note: i am not a very perect speller, so don't exsect this to be a million dollar perfetion.
it is compination of tragedy, saddness, dark, with little bits of comedy everynow and again (sorry for that, i am mostly a comedian.)
Credit for Image belongs to johnjoseco.

This story is a sequel to Past Sins

Side-story to Past Sins - Spike almost lost Twilight to a hangmare's noose, but now Twilight is safe and Nyx is a filly again. Normal life is returning. Still, Spike can't ignore the fact that Nyx just isn't the same as he remembers her. Her temper is more volatile, and, when she gets angry, all he can see is the rage-driven Nightmare Moon of legend.

And thus Spike has to wonder: Is Nyx truly reformed, or is she one bad tantrum away from calling herself Nightmare Moon again?

Twilight Sparkle and her fellow Elements of Harmony have faced down supernatural foes of the highest order, but sometimes the deadliest danger can come from places one would least expect. As Twilight is forced to bear a devastating secret, her efforts to keep the Elements together may well tear them all apart.
The plotline of the thrilling Pony Psychology Series continues with an exploration of deception, despair and Discord.
This series takes place between Season Two and Season Three.
Secrets and Lies shares the Pony Psychology Series TVTropes page.

Nightmare Moon always had a backup plan if she ever were defeated; she would slowly regenerate herself and regain her power. The problem is she never expected to come back as a defenseless filly, or to return directly in front of the princesses. As punishment for her past crimes, Luna has given her a sentence far worse than being sent to the moon again. Nightmare Moon must move in with Twilight and report to Luna on the magic of friendship. She's not very happy about it.

By the way I am not trying to rip off Past Sins in any way. Nyx is NOT in this story, this will go in a completely different direction.

There was only one explanation. For all of it. All of the strange, erratic behavior. Her irrational fear of the sun. Her nocturnal habits of locking herself in in the dark and closing all the blinds. Wearing her sunglasses everywhere, even inside! It was time to invest in some silver, garlic, and a wooden stake.