Prologue
"Far away, in the Crystal Empire, there were two sisters," Twilight Sparkle read out loud.
"That sure sounds like Princess Celestia and Princes Luna." Spike commented.
"Yes, but this book was written only recently. You can tell by the cover," She said, glancing at the glossy finish. "Anyways, these two sisters were twin princesses, and they were inseparable."
Spike peered at the illustration. "That looks like Princess Candace!"
"That does look like her, but she doesn't have a sister. I'm pretty sure of that. Moving on, one of the sisters was courted by King Sombra, but she spurned him, he also wanted to take over the Crystal Empire again. Furious, he turned his fury to her sister, and took her prisoner. She managed to escape, and blocked his attack. But the price of saving her sister cost her dearly. Sombra was defeated, but the Alicorn's horn was shattered to pieces."
"Whoa."
"She would never be the same. The princess left ruling the empire to her sister and hasn't been seen since. But it is said she still roams the skies, trying to find a cure to her broken horn."