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Sequel to My Little Alicorn and Bringing Up Blueblood.

It has been almost a year since Luna first uncovered the Arcanus E Draconus and used its dark powers to turn her sister into a filly. Since then, she has become more popular than ever, to the point where the Filly Scouts have invited her to officiate their Jamboree, which is being held in Ponyville this year. At the same time, Celestia wishes to reach closure with the infernal tome, as well as escape from her own growing concerns over her future in Equestria.

Little does Luna know that another force is in Ponyville, looking for revenge. And it might just settle for vengeance by proximity...

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Resubmitted and continued with permission from Hendy853, as discussed in this thread.

Part of RainbowDoubleDash's Lunaverse.

After months spent in the care of Corona, the Tyrant Sun, Spike has had enough. He strikes out on his own, leaving the insane alicorn and his friend Zecora behind. But it doesn't take long for Spike to encounter somepony new, a unicorn pony on the run from the law who seems to have a few screws loose...

Part of RainbowDoubleDash's Lunaverse's Hearts-and-Hooves Day collab.

Lyra and Bon-Bon love each other. That's obvious to anypony just walking down the street. But today, on the most romantic day in Equestria, something terrible has happened. And if they missed such an important holiday, what else could this possibly mean for them? Is their romance over? Is there any way to salvage what love remains?

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Part of RainbowDoubleDash's Lunaverse.

Raindrops has always had a problem with her anger, and despite her strong self-control, she sometimes can't help but lose it. Unfortunately, her latest explosion has not only gotten her suspended from her job, but also ordered to attend anger management. When she finds an alternative procedure, however, she's suddenly all smiles and giggles. Can her friends figure out what's happened and bring her back to normal? And more importantly, will Raindrops even want that to begin with?

The nefarious supervillain Lex Luthor has escaped to Equestria, and has even found a way to combine Kryptonite and magic to build the ultimate Superman-killing weapon. Before Superman can arrive to meet his maker, however, he realizes he hasn't had anything to eat in a while. And those cakes look awfully delicious...

Little does he know that Equestria has its own solar-powered protector, and she doesn't like it when you steal her dessert...

After the events of "My Little Alicorn," everything seemed to be back to normal...except for one pony.  Prince Blueblood is now trapped as a colt, his title, possessions and birthright stripped for his crimes.  Before Princess Celestia will return him to normal, however, he must prove himself by attending Magic Kindergarten.  Even worse, his current situation has attracted the vengeful gaze of two ponies he has offended in the past: the Captain of the Royal Guard and the Moon Princess.

Will Blueblood rise above his past self and emerge a better pony?  Or will he sink back into his old depravity, and be stuck a colt for the long term?

Note: This is a sequel to "My Little Alicorn," so you might want to check that out first.

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The Cutie Mark Crusaders ask Rainbow Dash and Fluttershy about what happened just after the events of the Cutie Mark Chronicles; specifically, what happened to Fluttershy and Rainbow Dash immediately after the race.  Reluctantly, Dash and Fluttershy delve into a tale.  A tale of a young Fluttershy's amazement at the world she had landed upon, and a filly Dash's desperate quest to save her from that most evil of places: THE GROUND.

Luna has had enough of Celestia's games, and has found the perfect means of revenge.  Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever.  Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.