Earos: On the Brink
Occasionally a Dragonborn will be seen today, but they are considered one of the fallen first races. They no longer hold any power despite having a few small villages in the far south. The only history found for them among the other elder races is an entry in the History of the Eladrin nation: Executed by order of King Oelemir II; 231.
The Dragonborn are a proud, noble race. But a race that is extremely isolated and views all outsiders with suspicion. From what can be seen from those few that do appear in other lands, they have no particular aptitude towards a particular class or power source.