Talk:The Crystal Empire - Part 2/@comment-88.101.133.155-20121118122352

My theory about the book:

Starswirl the Bearded was a powerful magician, who lived more than 1000 years ago. He invented spell to transform a pony (unicorn or pegasus) into an alicorn. The regal sisters used this spell to become alicorns and thus defeat Discord (and then Sombra). They kept the book for themselves and Celestia is testing her pupils (many generations of them). If they prove themselves to be worthy enough, Celestia reward them with turning them to alicorns.