The Crystal Eye (The Crystalline Chronicles Saga) by Blake R Wolfe

A bloodthirsty sorcerer seeks the power of the dragon lord’s crystal to rule the world. Can an escaped slave stop the evil that threatens to destroy all of humanity? A thousand years ago the dragon lords ruled alongside humanity and guided them through the weave of magic. When greed tore humanity apart, a powerful mage rose up to fight the dragons for their claim. In a single battle, the dragons were slain, the mage disappeared, and magic was removed from the world forever.