Dragonborn

Dragonborn are found in two varieties, with wildly different origins.

Metallic
Metallic dragonborn, also called Dragonborn of Numiel, are generally created from humanoids with great faith and devoutness to Numiel. Numiel grants a draconic body to his followers for service in the quest to support and protect all that is good and holy.

Some metallic dragonborn are born the old-fashioned way, to dragonborn parents: dragonborn, when they breed together, breed true; when a dragonborn breeds with a non-draconic non-dragonborn, the offspring has a 50% chance to be born dragonborn.

Chromatic
Chromatic dragonborn, sometimes called Dragonborn of the Burning Hate, were created in Gus by Sir Randolph Rifasson "the White". Sir Randolph bred together a myriad of chromatic half-dragons, kobolds, lizardfolk, and other dragon-descended persons, forming a small army of chromatic draconic humanoids to advance his purposes and the purposes of the Burning Hate.