[@Mister Thirteen]

Common folk lore state that the dragons are one with the elements. So, that would be : Fire, Water, Air, Earth, Gold dragon (light) and Black dragons (darkness). Of course, you don't need to follow the common folk lore. I believe that going for 6 types of dragons would give Rpers more choices and not limit their options. 

I am on board with the Orc war arc.  Maybe after the war, humans or some other humanoid species arrives in Eldenir and they are thought to be orcs when they only wish to...idk study the dragons etc. But let's deal with the first arc before talking in detail about other arcs. 

Magic maybe could be specific to their "element" if we do the element type dragon spin. A water dragon that could cast fire magic would not make much sense, right? 

I would be honored to help you with this RP as it's CO-GM :)