The Inconvenient Alliance

Introduction:
The empire sent out some men in a small scouting mission to find the one known as Grayson who stole a precious dragon egg and went rogue to the empire. They manage to find him and the ender hybrid drake, only to further follow and also end up finding a mysterious diamond along with them, but while entranced by it Grayson and Drake notice the scouts there, and a small fight begins, only to be ended by an unfortunate fate and quick, terrified fleeing of the area. The survivors of the empire head back and explain everything to the emperor of which he sends another group with some mages to further investigate it, only to find out that it is the sacred diamond from the stories, thought to be a myth but belongs to "him", and despite such things they manage to conceal its aura carefully, and claim it as the empires before "he" notices, knowing it holds great power that the empire may be able to use for its own interests. One destroyed by drake during the battle of the magic library, one captured by the empire now, and only one left remaining in "his" hands. Will the fate of magic in the world finally fall into the hands of the empire or will "he" manage to work with some of his enemies to be able to retrieve "his" stolen diamond and manage to bring back the fading magic in the land while also being able to defeat the empire once and for all with some help from others?