Pinkie Pie gains the ability to see dreams, and when the Cake twins start having bad dreams at night, waking up crying and sobbing, she takes the matter into her own hooves to keep them safe from the nightmares that plague them.
When she finds out that she can do this because of a dream parasite that's latched onto her, Pinkie needs help, and contacts the Princess of Dreams. Somepony cursed her with this parasite, but she has to stop it before she can get to the culprit, and stopping it reveals Pinkie has in her more than she thought.

Rarity has an idea; a fantastic idea! If clothing accented with crystals could be made beautiful, clothes made entirely out of crystal would be even more beautiful!

When she began creating them and working on a way to make it happen, she found out the stones were singing to her. Her work beneath Canterlot became not just an exercise in visual beauty, but in sound! As her work continues and near fruition, she brings Sassy with her upon request to see the final product.

Sassy finds it unpleasant. As Rarity continues her work, Sassy begins to question it, and finds out it's not as innocent as she might think.

A changeling and his brother live different lives, but one knows and the other doesn't. When jealousy rises, who has to pay?

Twilight finds out something isn't quite right about the crystal castle and herself. When she learns that something has changed about her and she isn't who she thinks she is, she tries to find out why and how that came to pass.
The answers isn't what she expected, but now that she knows, what will she do with that information? Will she change, continue, or end it all?

When Bon Bon and Lyra get to have a busy little getaway deep under the southern ocean, they think it'll be a lot of work and a good amount of alone time together. What they don't realize is that they're sharing this deep, dark section of the abyss with creatures that enjoy music, and now that they've heard Lyra, they don't want to let her leave...

When a spook named Mr. Mean tries to scare Applejack, she drives him off, only for him to confront her friends in their rooms. As they all fall prey to Mr. Mean, unable to drive him off the same way Applejack did, they begin searching for a way to stop him. When they get captured one after another, Twilight finally goes to visit Applejack, only to learn that this goes much deeper than just a single night.

The town of Hollow Shades had been abandoned for a long, long time. With the recent defeat of the Pony of Shadows, Moondancer takes an interest in the place and manages to get Celestia to sponsor a trip there for her to try and acquire what's left of Hollow Shades' history.
Upon arrival, Moondancer thinks she's hit the jackpot early, and begins researching what she can from the scrolls and books left behind. Unfortunately, there's a sound on the wind, and she starts hearing things. Then, she starts seeing things.
Hollow Shades isn't abandoned, just filled with things that aren't ponies.

When Celestia and Luna tell Twilight that being an alicorn comes with challenges and trials, and that she needs to control herself and her magic, they refer her to an old book on meditation. Twilight is skeptical at first, but she reads it anyway.
When she gets into it she finds that the book is not filled with sensible, helpful tips on meditation at all, but the message inside gets into her head. Eventually she starts having visions, and one vision in particular will not leave her mind until she brings it into the real world. The consequences change her views of Ponyville - and her duty to it - completely.

When Pinkie Pie isn't invited to prepare a party for somepony, she experiences a moment of existential fear. To cope, she invites her friends over for a party. Unfortunately, they're all busy that night, and ask her to reschedule. She does, hoping that will give them time to come give her party the attention it deserves.

Come the day of the party, Pinkie finds that her friends, contrary to her instructions and common party etiquette, have committed faux pas after faux pas, culminating in Rainbow Dash being late! She decides enough is enough, and confronts them all one by one about their manners and behaviour.

Starswirl the Bearded had always been curious, but when he conducts experiments with light, studying both the sun and the moon, he learns there is something more there than just two heavenly bodies. There is something on the moon, and the sun is causing something to happen to Equestria. He must tread carefully as he performs his research, because does anypony want to offend something as dangerous as the sun?