This story takes place between S3 E13 “Magical Mystery Cure” and S4 E25 “Twilight’s Kingdom”.

Sink holes have been appearing around the Everfree Forest and even as close as the outskirts of Ponyville, so the Royal Sisters know that it is time to strike a treaty with the Diamond Dogs before their tunneling causes houses to disappear into the ground.

While they’re away, they have to deputise two ponies to run Equestria on their behalf and the only two with sufficient magic are Twilight and Nyx.

How will Nyx react?

Is she ready for such power again?

This story is a sequel to Past Sins

When pursuing Starlight, Twilight and Spike experienced variances of Equestria, and saw how the river of time could have been different. Now, Starlight has moved in with Twilight, Nyx, and Spike and has begun her studies in friendship. To thank those who have helped her embrace friendship once more, Starlight has created an enchantment that allows the castle’s map table to let anyone glimpse other variances of reality.

The power to ask “what if,” can be a source of great amusement… but for some, the hypotheticals are haunting reminders of what could have been.

Six months have passed since Sonic, Shadow, Tails, and Nyx returned the Crystal Heart to the Crystal Empire. Now it is Sonic and Shadow's big day as they get ready to marry Rainbow Dash and Sunset Shimmer. But before they could perform the ceremony, Nightmare Amy crashes the wedding. She takes the main six away, and scatters them in different parts of Equestria. Now it's up to Sonic, Shadow, Tails, Knuckles, Nyx, Sunset, Spike, and an old friend of Sonic's to save them. Will they do it, or will Nightmare Amy finally get her revenge?

How far would you go to protect those dear to you?

Would you risk your own health?

Would you risk others getting involved?

Would you risk someone fading into non-existence by going back in time?

I know I do. And I will not fail AGAIN!

[Picture Source]

Nyx is an OC from Pen Stroke from his story Past Sins. (Add link later)

This story is a sequel to Past Sins

In the wake of the battle with Tirek, Twilight Sparkle becomes fixated on restoring Golden Oaks Library. After all, it was home for her little family of three. But as her attempts to repair the books and tree continuously fail, her friends must take matters into their own hooves. Discord, as the good friend he is, tosses Twilight and her extended family into an unexpected adventure while Twilight's other friends get to work on the new crystal palace.

All together, they'll do everything to ensure Twilight and her family have a place to call home when they reach the end of the road.

This story is a sequel to Nightmare At CHS

Over fifty years have passed since Selene ended up in Equestria as the reborn Nightmare Moon. The bulk of the mane 6 are now old and misses the good times she has had with them.

She should have known better.

Now Twilight spell experiment went crazy and Selene finds herself in another Equestria and meets a pony she never expected to see.

Edited by Whodafaq146 and Crystal Glint
Featured:
1/14/2016
5/6/2016
8/10/2016

It has been more then a month since the destruction of Mephiles the dark and harmony was once again restored in Equestria, so Celestia sends Sonic, Shadow, and their friends to the Crystal Empire to introduce them to Twilight's brother Shining Armor and her sister in law Princess Cadence. But the new Nightmare Moon decides to cause trouble and decides to make a new evil hedgehog named the Chaos Phantom out of the Chaos Emeralds to get rid of Sonic and Shadow once and for all. As Chaos Phantom arrives at the Crystal Empire during the night, the New Nightmare Moon tells him to take the Crystal Heart and then he disappears in a mirror before Sonic, Shadow, and the others could stop him. Can Sonic, Shadow, and two of their friends go into the mirror and stop Chaos Phantom or will he carry out the new Nightmare Moon's wishes and finish them once and for all?

This story is a sequel to The Story of Nyx: A Snowflake in The Wind

Several months after Nyx frees Snowdrop from the pony version of Purgatory, life in the small town of Ponyville seems to be finally calming down. The young couple's relationship is kept under wraps well enough to not attract much attention and it seems like it's only going up from here. But when the secret of how long Snowdrop has actually been dead is revealed, the two's relationship is strained and torn. Combined with the daily visits of Princess Luna, trying to investigate the sudden high levels of divine magic in area, can Nyx and Snowdrop make their relationship work? Or is it doomed to be a permanent divide?

This story officially takes place after Season 4
Editor wishes to remain anonymous.
Nyx is from Past Sins by Pen Stroke
Snowdrop:Link
Cover Source : Link

(short story/takes place after Magical Mystery Cure) Everypony is proud of Twilight becoming an Alicorn but Ben Mare is worried about what the future will hold for him and Twilight. Can Twilight reassure him that everything will be just fine?

It's been two years since Sonic and Shadow defeated Discord and now thanks to Sonic's friend Tails they can return to the land of Equestria. But when they get there they learn that their old enemy Mephiles The Dark has returned and has the five of the main six under his control and Twilight and the princesses as his prisoners. Can Sonic and Shadow along with their friends stop Mephiles before it's to late? Or will Mephiles finally get his revenge?

*note* This story contains five of the six Elements of insanity and contains Nyx from Pen stroke's Past Sins. Although this story features Pen Stroke's Nyx (Past Sins), this story itself is not related to Past Sins, nor does it require a reading of Past Sins. And although this story contains five of the six Elements of insanity I don't own them all the credit goes to their creator theinvertedshadow.