Shadow of the Dragon. The Captive

Every dragon needs a Shadow to remain human and rule. The Diamond Dragon claims that I am his Shadow. He threatens that he will never let me go. He even bound me with magic, and now I am his captive. But I will definitely find a way to return home, for something very important is left there. A piece of my heart, without which I cannot survive. If it means I have to put things in order in the dragon's realm, I am ready to do it. May the magic sword help me!