Where am I? Who are all these creatures calling themselves ponies? Why are they calling me Spike? Most importantly, how do I get home?

In a lonely cell, a broken, previous-human's psyche is buried deeper and deeper with the emergence of several other personalities, all with their own wants, needs, wishes, and traits.

The humans have travelled to Equestria to share their knowledge with the ponies. However, what the human scholars bring with them quickly turns out to be a bit much for the simple-minded locals.

Everyone in the Foundation knew 682. Most of them knew not to talk about him. Not to talk to him, more importantly, for fear of invoking his wrath. That creature made every single thing in the facility frightened, and they knew they couldn't do a thing about it. So what happens when he vanishes without a trace? Chaos. Absolute chaos. But this isn't about what happened there; this is about what happens to where he was transported. Which, coincidentally, is precisely the same thing.

Dedicated to everyone's favorite hard-to-kill reptile. You my boy, hamdoggz, for providing such an awesome rendition of it.

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

King Sombra’s dark influence was obliterated by the Crystal Heart, and the villain is well and truly dead. But when he attempts to steal the afterlife of an innocent victim, a human spirit is left hurtling towards Equestria, where this unfortunate soul is revived into the only vessel available: the reconstituted body of King Sombra himself.

Thus, a cheerfully oblivious alien is crammed into the form of the most evil and malicious being Equestria has ever known. Not that Shining Armor and Cadence know this, of course. As far as they are concerned, the King is back and he’s lost his fricking mind.

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Everything dies.

Sometimes sooner than it should, and sometimes not for very long.

When death proves to be a bit more impermanent than it should be, Celestia is left to figure it out.

As well as why the new citizen of her fair land seems so intent on keeping the answers to himself.

Twilight Sparkle's imagination as a child was unbelievable, probably due to all those books. Which also make up the amazing Fort Book, Twilightopia's first stronghold against the country of Armor! With the help of Captain Smartypants and Private Cadence, General Twilight defends her fort against her brother's advancing army of one!
A tale of Twi's childhood told from her point of view.

Inspired by the cover picture.