A world of our own

Since before I could remember, I've been having these dreams. Dreams where I was a different person in a different world. The world was about magic, and magic was power, and I was the most powerful magician. I thought it was just dreams from a powerful imagination, until the day when I accidentally cast magic in the real world. That was the day when the first stone was cast. What was magic? What were these dreams? What is real? And what did I set into motion?