THIS IS A MY LITTLE PONY ORIGIN STORY I MADE UP. IF YOU DON'T LIKE MY LITTLE PONY, NOT A FAN OF IT, OR KNOW NOTHING ABOUT IT, GO!
OH, AND NO MEAN STUFF.
Once upon a time, there was a beautiful alicorn named Princess Velvet. Her cutie mark was a heat, a magican's want, and a magicain's top hat. She preformed tricks for all of Equestria. One day, an evil pony by the name of Grimm Hay came. He had a contest. Whoever won would get an infinite ammount of Bits. Whoever lost would be banished inside of an amulet.
So the contest was held. Velvet's magic was very weak. She fainted. So, Grimm picked up a red stone, and used a spell to trap Velvet inside. Later, he cast the stone into an amulet shape, and called it the Alicorn Amulet.
When a pony is trapped inside an object, (notably unicorns and alicorns) they can still use their magic. Whenever someone wears the Alicorn Amulet, they get possesed by Princess Velvet's magic, and their mind transforms into hers.