For as long as the oldest of them could remember, the Guardians had defended what remains of humanity against the forces lurking in the dark. With gun, blade and the Traveller's Light, the heroes born of Earth put themselves between the monsters from the void and those too weak to fight back. Human, Awoken, Exo; the physical coil of the Guardian had never truly mattered so long as they were willing and capable of defend their homeworld.

Until a Guardian came from the wastes that was neither Human, Awoken or Exo; a Guardian not born of Earth.

(Destiny/FiM Crossover)
(Gore tag for blood and violence)
(Thanks to Noble Cause, BradTheBrony and Metallusionsismagic for prereading!)
(Possible Spoilers in the comments, BEWARE!)

Twilight had planned to visit Sunset Shimmer and her friends over in the other world for a nice, quiet weekend, away from all the worries and problems associated with being a Princess of Equestria. Unfortunately, things rarely go as planned.

After an accident cuts her off from Equestria, Twilight finds herself stuck in the human world until the gateway between the two worlds can be fixed. Which wouldn't normally be a problem...

...If she wasn't still a pony.

Now with TvTropes page!

Cover art
Proofread by Dusty Old Qrow, RQK, Dusty Tomes (Ch. 2), Emtu, and Doctor Candor.

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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Have you ever had a dream that just seemed so real, that it was impossible to say for certain that it was even a dream at all? A dream that, despite all of its impossibilities, seemed to re-write your entire perception of reality, re-writing your sense of what—and indeed, who—you are? Accepting change is hard enough as it is. But when you're a somebody who wakes up as a somepony, how do you cope with the impact such a drastic change has on your mind and body? With changes like these, it must surely just be a lucid dream—albeit a suspiciously accurate one—just brimming with potential and ripe for exploration. So you might as well suck it up and make the most of these distressingly…unusual circumstances, and seize this psychological adventure before you wake up and the dream ends.
After all, this couldn't possibly be real, so the dream must come to an end eventually…right?