Celestia is not invincible. Strong, yes. Ageless, assuredly. Magical, undoubtedly. But not invincible.

The Princess of the Day has been attacked, and she did not escape unscathed.

While Luna fights against the mortal fear gripping her subjects in the wake of the assassination attempt, the enemy runs free. Twilight Sparkle must assemble a team to bring the pony to justice. Few ponies can be trusted, and fewer still can be expected to succeed.

But the kingdom has heroes: The Knights of Harmony. Ponies who have stood against evil and won, who fight to make Equestria a safer place. Each is an expert in their particular field, masters of their trades, but they have yet to work together.

An adventurer past her prime.

A tinkerer with too much time on his hooves.

A spy whose primary instinct is to lie.

A dishonored soldier with an axe to grind.

As they delve into the origins of the assassin, they find that Equestrian history still has secrets long buried. Can the knights come together as a team before she finds her next mark?

One day, after a long and complicated genealogy project, Sundance goes to visit his distant grandmother so he can say hello...

In return, she gives him a headache.

An experimental entry in the Weedverse.

A human has arrived in Ponyville that the Apples dubbed, "Anonymous."
Twilight is worried he might be dangerous. They know nothing about him after all. However, the Apples still treat him like a common pet, until he begins mimicking speech.

Princess Celestia has always been an incredibly busy pony who never has enough time in the day to do what she wants. Time seems to slip by as she struggles to get all of her work done.

One day, however, something terrible and unexpected happens, and more time than ever is lost to the sands. When Celestia reawakens, she'll find that her entire world is gone and that almost everything she knew and loved has long since disappeared.

A tale of sadness and of tragedy, the likes of which not often seen. Celestia, Princess of the sun...grand ruler of Equestria, and loving sister. Painful are the tears she will shed, and broken her heart will remain.

There is no greater pain than that of utter helplessness.

Pincer is a changeling, a proud soldier of Queen Chrysalis. After the failed invasion of Canterlot, he finds himself trapped and at the mercy of Princess Celestia's Royal Guard. Believing that Celestia sees his species as nothing but soulless monsters, he prepares himself for the worst. The weeks crawl by, marked by an endless series of questions he will not answer for fear of endangering his friends and family at The Hive. As his nerves wear down and his interrogators learn just how ruthless he thinks they are, they have nothing to report but his belief that they will kill and destroy his kind without mercy.

Celestia steps in to prove him wrong, and what Pincer learns leaves him questioning everything he has ever known — but also gives him hope for what he'd never thought possible.

Cover art commissioned from http://www.demonkings.com.

Now with a TVTropes page.

Well it's not actually a sequel. Here is a collection of short stories and histories detailing the life of Alternia, a changeling queen impersonating the life of Princess Celestia. These are the stories of the ruler under her mask.

Reading the main story: Princess Celestia: The Changeling Queen is a requirement if you don't want to be spoiled or confused. I will try to provide background information when I can.

For readers of the main story, there are basically no spoilers if you've read past chapter 8. Enjoy!