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Once upon a time, the magical land of Equestria was ruled by two sisters: one who governed the sun and one who controlled the moon. However, the darker sister grew resentful and turned upon her sibling, becoming the dreaded Nightmare Moon. In order to save their subjects, the elder was forced to call upon the Elements of Harmony, sealing her away in the moon and taking the burden of controlling the night upon herself. Ever since then, Equestria has been peaceful and harmonic...At least, that's the version of events passed down by Celestia herself. Twilight Sparkle, however, suspects there's more to the story than that... and she wants nothing more than to see that mule fall.As the name implies, Friendship is Betrayal is a Darker and EdgierFanComic based on My Little Pony: Friendship Is Magic. Rather than being Celestia's faithful student, Twilight merely pretends to be loyal while plotting to bring about the cruel alicorn's downfall. To succeed, she'll need allies — but who, if anyone, can she trust? As both mentor and student prove, the most sinister of intentions can be hidden behind the brightest of smiles.
This Fan Webcomic contains examples of:
A Day in the Limelight: Each episode features a different primary POV character. "The Mare in the Moon" focuses on Twilight; "Griffon the Brush-Off" primarily stars Pinkie Pie, and "A Dog and Pony Show" revolves around Rarity. Fluttershy is featured in "Dragonshy", and Rainbow Dash takes center stage in "Sonic Rainboom".
Cassandra Truth: When they first meet, Nightmare Moon refuses to believe that Celestia's 'faithful student' is just as eager to see her fall as she is. Ironically, Luna herself struggled with this in the past, when she couldn't make anypony believe that her sister was evil.
Darker and Edgier: Celestia is a tyrant, Twilight is super paranoid, and it all goes downhill from there.
Demonic Possession: The 'Metamorphosis' spell Twilight tests on Rarity causes her to be possessed by Nightmare Moon. Rainbow becomes a secondary victim when Nightmare Moon senses her resolve is waning.
Dropped a Bridge on Him: The off-panel deaths of the Cutie Mark Crusaders is casually revealed while Pinkie's joking around with her friends. However, it's done without her naming names, setting up for an Internal Reveal that could be catastropic.
Twilight Sparkle: "That's surprisingly wise coming from a homicidal maniac."
The Ending Changes Everything: Twilight seems satisfied with the results of "Dragonshy"... and so is Fluttershy, who sports one heck of a Slasher Smile while gloating about how she didn't get caught by her loyalty test.
Friend or Idol Decision: "A Dog and Pony Show" starts this way: Celestia offers Rarity a penthouse in Canterlot in exchange for designing a beautiful gown for the princess to wear to the Grand Galloping Gala. However, Rarity fears that if her friends learn about this, they'll suspect she supports the mule... So she tries to Take a Third Option by completing the work secretly.
Hanlon's Razor: Due to her paranoia, Twilight is always looking for something that'll prove one of her friends is a traitor, and will leap to that conclusion whenever a new detail presents itself. In "Griffon the Brush-Off", for instance, she immediately assumes Pinkie betrayed everyone simply because Fluttershy didn't recognize Gilda's name.
Heel Face Mole: Played with in "Griffon the Brush-Off", where this was Dash's plan all along, but she bucked it up.
Killed Off for Real: The Mare in the Moon arc ends with Luna dead at her sister's hooves. "Griffon the Brush-Off" adds the swamp hydra and Gilda to the body count, and "A Dog and Pony Show" adds the head Diamond Dog.
Nice Job Breaking It, Hero: Nightmare Moon accuses Twilight of this: in defeating her, she may have accidentally ensured that nobody will be able to stand against Celestia.
At the core of "Griffon the Brush-Off"'s events: Dash thought she could manipulate Gilda into joining their cause, but just put her friends' lives at risk. Lampshaded by Pinkie declaring this An Aesop.
Of Corset Hurts: While fussing over Twilight, Rarity tightens her corset a little too much...
Pacifist: The central conflict of "Dragonshy" is that Twilight wants to exploit Fluttershy's Beastmistress talents to kill a dragon, while Fluttershy struggles with this concept, aware that if she backs out, Twilight will label her a traitor.
Refuge in Audacity: While trying to motivate Fluttershy, Pinkie casually reveals she murdered three fillies because she thought they were trying to steal her pie. Rarity and Applejack both laugh at her randomness, unaware she's talking about the CMC.
In "Dragonshy", if Fluttershy refuses to break her Pacifist ways and kill a dragon, Twilight will take that as proof she's The Mole.
In "Sonic Rainboom", Rainbow Dash intends to use the Sonic Rainboom to kill Celestia, even though she knows that will destroy New Cloudsdale as well... but it becomes more sadistic when her friends show up as well.
Secret Test of Character: "Dragonshy" revolves around Twilight testing Fluttershy's loyalty by setting her against a dragon. She's not very good at concealing her motives, however, and Fluttershy quickly realizes the Sadistic Choice she's faced with... and plays Twilight like a fiddle.
Self-Made Orphan: Twilight accidentally became one, while Pinkie Pie deliberately did so.
Start of Darkness: The seeds of Twilight's resentment of her mentor were planted when she left her parents cursed as plants, gleefully telling Twilight the curse she'd accidentally laid upon them could never be reversed — but that was okay, since that meant she could take her on as a student!
Pinkie Pie was disowned by her parents because laughter was 'a sin against God' and forced into slave labor. Before she was Driven to Suicide, however, she witnessed the Sonic Rainboom and became more positive... and Ax-Crazy.
Rarity didn't get to star in the school play, and turned to Black Magic to make everypony more interested in the costume she designed than the actual actors. Oh, and Luna dragged her away from her home and told her she was one of her chosen ones.
Fluttershy was constantly teased and belittled by her peers for being a weak flyer. Rainbow Dash was the only filly who showed any concern about her, but didn't rescue her when she knocked her off a cloud during the race.
Take a Third Option: Join Nightmare Moon's rebellion or perish? Twilight would rather take down both alicorns, thanks.
In "Dragonshy", faced with either breaking her moral code to kill a dragon and prove her loyalty or her friends turning on her as a suspected traitor, Fluttershy decides to blind the dragon instead.
The Stations of the Canon: A rather large station-skipping occurs when Twilight drinks the wrong thing and awakens in front of Nightmare Moon.
Broad Strokes: The author also welds elements of different episodes together, like the Hydra from "Feeling Pinkie Keen" appearing in the middle of "Griffon the Brush-Off''.