The Jasuru are often assumed to be the first of the higher races. They share the rough size and shape of the Firstblood, but with the metallic scales of lesser dragons. Most likely, they were created as a rough warrior caste, overseers to control the Firstblood slaves.
The Yemmu are clearly a later improvement. Their great size and massive tusks could only have been designed to intimidate the lesser races, but as with other examples of crafted races, the increased in size and strength has come at a cost. Of all the races, the Yemmu have the shortest natural lifespan.
The Tralgu are almost certainly the most recent of the Eastern Triad. Taller than the Firstblood and with the fierce teeth and keen hearing of a natural carnivore, common wisdom holds that they were bred for hunting more than formal battle. In the ages since the fall of dragons, it is likely only their difficulty in whelping that has kept them from forcible racial conquest.