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?

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.

Failing once in her attempt to take Canterlot and failing again in her attempt to take down Twilight, one would think Chrysalis would have cut her losses and let things be, but the queen has once again appeared, this time in broad daylight with no disguise and no army. Her weapon of choice? Diplomacy.

Now Twilight is having to deal with the changeling queen, but surely putting up with her antics will be worth the knowledge she's willing to provide about her mysterious race and the potential undiscovered agents still within their midst...right?

Takes place before Magical Mystery Cure and diverges from there.

With thanks to MisterGunpowder for proofreading and editing.

Revision History:

05/09/2015: Chapter 1 updated with millions of little corrections.
05/20/2015: Chapter 2 revised and edited with another million small and large corrections.
06/12/2015: Chapter 3 given a thorough editing and revision.
06/23/2015: Chapter 4 taken to the gutter and edited twice to be sure.
07/14/2015: Chapter 5 thoroughly brutalized with the editing stick.
08/03/2016: Chapter 6 finally edited. Yes, I'm still alive, dammit.
09/29/2016: Chapter 7 fell out of the editing tree and hit every editing branch on the way down.
10/26/2016: Chapter 8 has emerged from the editing emergency room.
11/17/2016: Chapter 9 found and edited. No casualties reported.
11/30/2016: Chapter 10 treated for whiplash after lightning fast editing.
12/22/2016: Chapter 11 edited. Chrysalis shot first.
01/17/2017: Epilogue edited. Time to hit the cider.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

This story is a sequel to The Three Whooves

A letter from an ailing relative finds the Doctor and family in danger at the side of Ditzy's great aunt, Daring Do! Why does she recognize him? What evil stirs in her trophy cases? Can the Doctor save the day before his in-laws kill him?

Vectors used created by Durpy, luga12345, and DrumblastingQuilava

Be Awed and Amazed by the tale of Sweetie Belle as she traverses the multiverse in search of her lost mentor and friend, Twilight Sparkle! Will she find her in post-apocalyptic Equestria? Or maybe in a strange world where everypony is the wrong gender? Or even where a Pony claims to be a human? Read as she journeys through very familiar worlds you might have read about... if you dare!

At this point in time all the main worlds to be visited have already been chosen. Thank you all for the suggestions, and I hope you enjoy the surprises!

Here's the official TSC:F Music Intro: The Sweetie Chronicles: Fragments

WDTP: S2/3-CE
You can also visit the TV Tropes Page which has spoilers!

This story is a sequel to The Best Night Ever

Final Arc - The Black Wedding
CH63 - If I Had a Heart
- The ponies of the Fourth Tribe are ascendant. Shining Armor hunts down his changeling "daughters," and even Lady Antimony won't get in his way. Meanwhile, high above the burning city of Canterlot, a long awaited reunion occurs, and Twilight confronts Alpha Brass and makes a final decision.

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It began with a mare from Ponyville and a time-looping Prince from Canterlot. This most unlikely union now stands at a crossroads: a ruthless changeling invasion; a conspiracy within the highest circles of the Equestrian aristocracy; a half dozen power hungry noblemares looking to become a Princess in all but name. With the prize of Canterlot and its Platinum Crown at stake, it falls to six Elements of Harmony to once again save not just Ponyville, but all of Equestria.

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TVtropes page is here: link

The prequel to TPC, "The Best Night Ever" is here. link
The side-story crossover with "Sweetie Belle Chronicles" is here. link

Someone out there made a playlist for Platinum Crown: Rarity, Blueblood and Chrysalis. Pretty sweet!
Wish I knew who, or even when they did it, though. I especially like the Chrysy playlist.
https://8tracks.com/explore/this_platinum_crown/hot/1

I've gotten some cool TPC related art done, too.
So Sweet and Tasty's TPC Cover Art
link
Thanks to Madmax for these two:
Rarity, Blueblood and Antimony
link
Dash and Ritterkreuz
link
The Terre Rare Founder - Lady Arsenic
link
Twilight and Alpha Brass Battle Duet
link