|“||You are not the prize we are looking for. But it will be a joy killing you anyways,||”|
– Two Alicorns finishing one another's sentence
Alicorns are a race of pony that possess all three distinguishing features of the other pony races: the horn of a unicorn, the wings of a pegasus, and the fortitude of an earth pony. As such, this also grants them access to the inherent magical abilities of all three races: a unicorn's ability to directly control magic, a pegasus' ability to fly and manipulate weather, and an earth pony's natural affinity to the earth. Prior to the war, alicorns were considered goddesses, and the only two known alicorns were Princess Celestia and Princess Luna.
After the death of Princess Celestia and Princess Luna, the only alicorns in Equestria are artificial, created through deep exposure to the I.M.P. fluid developed at the Maripony, Ministry of Arcane Sciences facility. They have only been a visible presence in the Equestrian Wasteland for roughly ten years leading up to the opening of Stable 2.
Alicorns are one of the most feared sights in the wastelands, due to their abilities, malevolence and loyalty to The Goddess and Red Eye. Littlepip and her group has came into conflict many times with alicorns and are often only able to win through a mix of luck, surprise or overwhelming firepower.
The Alicorns having lost the leadership of the Goddess along with Maripony were left with no means to survive as a species, turning to seek out Red Eye, who planned to become an Alicorn himself, and promised to create Male Alicorns so the Female Alicorns the Goddess made would be able to procreate and survive. With the death of Red Eye, along with the re-created I.M.P. Facility built beneath The Cathedral, the Alicorns decided to turn towards Velvet Remedy for help since her kindness helped save their lives at times, dubbing the unicorn as their de-facto leader. They remember Velvet showing them compassion and Littlepip as one who kills them but want no further confrontations with Littlepip who they now deem The Destroyer. The Alicorns assist Velvet Remedy in her part of Littlepip's plan protecting her from the Enclave Pegasi in order to gain control of the Single Pegasus Project and completely end OperatioN Cauterize once and for all.
Also worth noting is the Alicorns abilities appear to be growing now they are free of the The Unity as shown by the Alicorns using each other's abilities regardless of color.
During the Epilogue, set a decade after the events of the story, the zebras of Glyphmark managed to successfully synthesize a compound that would be able to turn Alicorns male (a brew which Fluttershy noted included Killing Joke extract), allowing the Alicorns to naturally procreate. In the New Canterlot Republic which was set up by Velvet Remedy and Calamity, a pink Alicorn filly named Surprise lives in the small town: the third such Alicorn to be naturally born, but also the first whose coat color wasn't a form of Purple, Green or Blue like the artificial Alicorns.
Appearance and Abilities
The synthetic alicorns (or alicorn drones) are all female, with no cutie mark(even though both male and female ponies can be turned). Alicorns are dark-coated, although they vary in appearance and specialty, with the three varieties each corresponding to the unicorn mares "who were powerful enough to exert influence over the alicorn creation process." Alicorns with dark purple coats have the ability to teleport, as this was Twilight Sparkle's special ability. Dark blue alicorns can turn invisible, as Trixie was the only unicorn to develop such a spell. The dark green alicorns can generate nearly impenetrable shields, and can cooperate with other green alicorns to amplify their powers. Their power comes from the green pallet-swapped twins Gestalt and Mosaic, who had the odd habit of not only finishing each other's sentences, but even each other's spells.
Alicorns are telepathically under control of The Goddess, and anything witnessed or experienced by one alicorn is learned by all of them simultaneously. As Littlepip quickly realizes, the same trick doesn't work twice on alicorns (unless they severely underestimate an opponent).
Alicorns are able to supercharge their powers through exposure to radiation, growing in both size and capability. Conversely, proximity to Pink Cloud has a disruptive effect on the telepathic abilities of alicorns, forcing them to awkwardly revert to speaking aloud. Owing to their similar appearance and malevolent tendancies, zebras refer to alicorns as Nightmare Moons.
Princess Celestia -Ruler of Equestria and eventual co-ruler of Equestria. Abdicated the throne to Luna.
Princess Luna - Formerly Nightmare Moon. Ruler of Equestria during the Great War.
Nightmare Moon - A transformed Princess Luna.
Nightseer - An artifical alicorn leading the others in Canterlot. She wore Princess Luna's skull as part of a necklace. Killed by Littlepip, who telekinetically killed her using the skull's horn to stab her in the head.
Surprise - A pink Alicorn filly of natural birth, she is a citizen of the New Canterlot Republic and is noted by Fluttershy during the Epilogue as the third to be born; yet at the same time the first whose natural coat isn't a shade of purple, green, or blue.
Princess Cadence - Luna and Celestia's niece. She is mentioned in Project Horizons as a minor pre-war character.
Lacunae - An artifical alicorn whose soul is composed of weaker personalities and doubts of the rest of Unity. She bears a striking resemblance to Luna. She is one of Blackjack's friends and companions
Aurora Borealis - An artificial alicorn free from Unity & the protagonist of New Beginnings, rediscovering who she is and trying to do better. Adoptive Mother/Guardian of Silent Requiem. Owns a Pipbuck and struggles with various identity issues.
Snakebite Tourniquet - An artificial alicorn free from Unity and the protagonist of the story Misfits. Snakebite is seeking answers about the fate of his caravan
Calculare - A monstrously large artificial alicorn who is shown to be excessively powerful, especially with her magic.
God - A very large mutant alicorn male, encountered by Dead-shot outside the Casino Royale. God was a servant/slave of a diamond dog named Dog, who was killed by killer toy robots. God in a fit of rage attacks the toys and becomes Dead-Shot's servant.
Platinum Haze - An alicorn running a school/orphanage in the tunnels of Dise. She is a member of the Followers of the Apocalypse and a former resident of Dise, which is why she chose to go there and teach.
Diamond Sky - An alicorn who is assisting Platinum Haze in running their school/orphanage in Dise. She prefers working with older children and is more responsible. She acts like an older sister to Haze and warns Hired Gun, not to try and take advantage of her.
- Alicorns are the Fallout Equestria universe's equivalent of Super Mutants from the Fallout Series.