This story is a sequel to Petriculture

It's been several months since Pinkie Pie made a stunning admission about her past that permanently changed her relationship with her friends, particularly Twilight Sparkle, but life seems to have settled back to normal (well, normal by Pinkie Pie's standards, at least). However, when an old nemesis returns and ensnares Twilight in her influence, it's up to Pinkie to make things right.

This is the second story in The Petriculture Cycle. There is a TV Tropes Page for the entire Cycle here.

Cover image by Page Turner; "Princess Twilight" vector by Nianara.

The supernatural: Ghosts, zombies, werewolves, spirits... vampires...

Twilight Sparkle always thought that the supernatural was just a bunch of superstitious nonsense, just some scary stories to tell around a campfire. She couldn't have been more wrong.

After an occult ritual gone horribly right, Twilight finds herself among the ranks of these so called 'myths', whether she likes it or not. Due to the same force that changed her, dark shadows have begun to spread across Equestria, bringing to life these ancient fairy tales. And Twilight might just be the only one that can stop them...

For better or for worse, Twilight has been changed. Will she embrace this dark gift and become the hero Equestria needs, or will she eventually succumb to temptation and become the very thing she fights?

Twilight receives an urgent message from the Princess to meet her, but it comes with something she didn't expect... a bouquet of flowers. With nothing but the words "It's very important!", Twilight sets off for Canterlot.

Spanish Translation by SPANIARD KIWI: https://www.deviantart.com/spaniard-kiwi/art/La-reina-y-la-pupila-1000351296

Getting a college roommate is random chance.
Sometimes you get lucky, and sometimes you get a pony.

Rainbow Dash enrolls at an Earth university.

Update: and then some other stuff happens.

The last thing you remember was being blown out a hole in the side of a crashing star cruiser, catching fire in the upper atmosphere and falling to your death upon an alien world below, yet there you are, whole and mostly unscathed and without a clue how you got there. But just because you survived the crash, it doesn't mean you're anywhere near out of the woods yet. With nothing but your power armor, rifle and wits to guide you, can you survive the depths of the swamps and forests of Everfree? And even if so, what about beyond?

[Second Person POV] [Sci-Fi]

Twilight Sparkle is taken into the nightmare of SCP when containment is breached - can she survive?

Cover Art By: Limey-Boy
Based on the SCP Foundation.

In a moment of weakness, Chrysalis had more than a taste of Shining Armour's love. 11 months later, Twilight Sparkle finds herself a brand new niece by way of 'A small foal in a basket on my door step'.

Special thanks for the picture by Awilldrawforfood1
Now edited with DoomManta.

What happens when you discover that your most private of sanctuaries is no longer there? Two beings, one man and one pony, learn just that when they find that their bathrooms are no longer their own. How do these beings handle this strange occurrence and will they let it get in their way?

Since This isn't my bathroom! did so well and I was told by many to do more, I have transformed this into a short series where one poor man will be subjected to more room swaps than should ever happen. Yes, the first addition to the bathroom is the kitchen..

After a mishap involving the Transportalponder, the Courier finds himself in a place he doesn't recognize. With no way back and nothing else to do, he decides that wandering into the nearest town is the best option. Being the Courier, things aren't that simple...

A Fallout: New Vegas/My Little Pony: Friendship is Magic crossover

The style alternates between omnipresent third-person and the Courier recounting his tale to... Well, take a guess.

Twilight Sparkle wakes up one morning to a harsh dose of unreality. She is stranded, without her friends, on an island which matches no known locale on Equestria. Surrounded and harried on all sides by the alien and the dangerous, she will find her mettle sorely tested, and find perhaps that the best friends you will ever have in your life are the ones you make when your back is to the wall...

Thanks to CedricBale and noobie56xx for tracking down the name of the artist so I could give them credit.