Google Dragon. Dragons in this world can change color and element based on how they are feeling. Fire is for rage which is why most people of this world associate them with fire, that is the element that is murdering them the most.
Crost is a 12 century old dragon. He spent the first eight centuries of his life acquiring the great magical artifacts of the world. He stole form other dragons, raided ancient Athlon ruins, and made deals with the great wizards throughout the ages. Now he is retired having acquired a horde so vast he had to clear out a hundred miles of Dark Road cavern just to store it all. So he loans out the artifacts for the servitude of their first born child.