Dragonkind: Dawn of Prophecy

People from a planet called Stelladahn have landed on Earth just as humans start creating their first civilizations. At first, the people seem friendly, promoting peace and sharing their incredible magic with the natives of their new world. While the Dragonian's look like any other person, they have the ability to transform into towering beasts we know as dragons. They carve out a canyon and create their capital in the middle of a magically created lake, claiming their own piece of land out of the uninhabited region of Earth.
A terrible tragedy during the birth of the Dragonian King's son causes the dragons to enslave humanity and begin despotic rule over the planet. The dragon hold on the land surrounding their black castle Ellende begins to tighten as the King's closest allies start questioning his motives and sanity. Fourteen seasons later a plot against the King to free the humans starts to unfold. At the center of this plot is the young motherless Prince. He will be forced to learn what it truly means to be free and what it means to fight for those who can't.