He who fights monsters should see to it that he himself does not become a monster.
But, sometimes, the only way to fight monsters is to create monsters of our own and show them, we're not defenseless.

Evil has multiple faces and the Mane Six have defeated many of them. But what will happen when the new one is way beyond they can handle?
When a new threat come to Equestria, menacing to destroy everything at their path, the world will change. War will arise and the once peaceful ponies will have to embrace a new way.

Invaders think they can conquer Equestria? Just who the hell do they think the ponies are?!

(Massive Multiplayer Crossover with Transformers, Mazinger Z, Getter Robo, Gundam Wing and Power Rangers)

Equus just survived an impossible war. It's been a month since the Super Robot Squadron saved the planet from the sinister enemy.

Now, peace reigns in the magical land of Equestria once again, reconstructions are in order, the mecha pilots can go back to their normal lives and the Super Robots are about to be sealed away until the world needs them again.

Trixe and Rainbow Dash, two veterans of the robots wars and master pilots, have always had a stormy relationship. Although they were on the same side, rivalry and competition have accumulated over the time but always put aside for the sake of saving the world. Now that the war is over, they can finally see who is truly the best.

Trixie and her Great Mazinger or Rainbow Dash in the Getter Dragon?

Princess Celestia has no problem with leaving the three Sirens in the realm across the mirror, in effect dumping her own world’s problems on another world. Princess Twilight Sparkle makes regular visits. Sunset Shimmer, while redeemed and intent on staying there, is still a foreigner to the human realm. Sunset knows this status quo can't last, especially after not one but two schools know about magic following the Friendship Games.

Sunset soon decides that, if Equestria has no problem with its own citizens visiting other dimensions, it better be prepared to allow the reverse. Thus begins Sunset's Extradimensional Tourist Agency.

What freaks her out is just how many people adore the idea of temporarily becoming magical coloured ponies.

Other Characters tag includes the Shadow Five. Sex Rating will be for innuendo and references.

When history is rewritten so that Equestria is doomed, it's not a hard choice to try to revert the timeline.

While battling Starlight Glimmer's interference with the timeline, Twilight is faced with a moral dilemma when she lands in a timeline which has weathered Equestria's trials almost as well as her own. How can the lives of those living there be balanced against her vanished world?

Season 5 Finale-related.
So many realities. So many horrible futures. But in yet another alternate timeline, Twilight finds herself in the Golden Oak Library with the Princess of Friendship: Sunset Shimmer. Rather than the awful futures she's seen before, she now finds herself in a timeline that actually seems nice. But that means she has a tough decision to make...

-Awesome cover art used with permission from the amazingly talented Huussii (Teemu Husso).
-Based on an idea from Silver Quill.
-Featured as of 12/8/15! Thank you to all the readers!
-Editors: GenerousGhibli and E3gner

After the most important night of her career is ruined and its saboteurs not even so much as punished, Octavia's life changes. She begins to pursue a path that has never been seen before in Canterlot, where concertos and rhapsodies give way to controversy and rebellion.

A path where symphonies are composed with cans of spray paint.

Cover art used with permission by LuGiAdriel14

This story is a sequel to The Assassination of Twilight Sparkle

(Alternate Continuity to Rated Ponystar's The Assassination of Twilight Sparkle)

A plot to assassinate a newly crowned Princess. A guard's warning. A trick, and vanishing. After an assasination attempt on the life of Twilight Sparkle is discovered, the perpatrators think they have succeed but they were wrong.

For, perhaps, Twilight Sparkle yet lives.

MLP/Undertale crossover.
Not a PWNY-verse story.

Long ago, the Monsters and Humans fought a great war. The Monsters lost, and were sealed in the Underground. It would take the power of seven human souls to break the barrier that kept them imprisoned. They only had six. And so the Monsters waited and hoped, praying that another human would find their way to the Underground. Some thought the seventh soul would give their King the strength to break the barrier. Some dreamed of a human who would be their friend, and save them all...or had nightmares of one who would bring back the war.

...but nobody came.

...but somepony did.

Eons after the war, with no way to tell how much time had passed above, a tiny blue filly with wings and horn fell into the underground, calling for her Mama. None knew the poor creature's nature or origins...but her soul was powerful with magic, even more so than a human soul.

None can know what will come...of this little 'Woona'.

Cover art by Sanyo21

Bringing a lost empire into the modern age is stressful enough, but for a pair of young lovers, the weight can be difficult to bear. Fortunately, their love is stronger than ever. Their vows to one another the solid foundation of their marriage. There is nothing he wouldn't do to protect her from harm, nothing he wouldn't do to show his love. But, whether he is Captain of the Guard or Prince of the Crystal Empire, Shining Armor is her stallion, first and foremost. Her beloved. For the one who captured her heart, Princess Cadence will protect him from that which would harm his spirit—whether he knows it or not.

Editing and prereading done by The Albinocorn, Bad_Seed_72, Foals Errand, Meridian Prime, and Zodiacspear

Artwork originally done by Silfoe/RoyalSketchbook and used with permission.

Somepony is sabotaging Moondancer's research project.

Twilight Sparkle suspects Starlight Glimmer may be responsible. She enlists the Canterlot Royal Guard to protect Moondancer, and offers to help with her research.

Soon, however, the two ponies discover an unexpected side effect of Moondancer's research: one with dangerous consequences for all of Equestria—and possibly even their friendship.

Inspired by The Writeoff Association's "Out of Time" contest.