Like all other Mobians, they were a bi-product of mutation by the Xorda's Gene Bombs. Dragons had lived in harmony with inhabitants of Mobius up until very recent times, when the takeover of Dr. Ivo Robotnik and the process of roboticization resulted in most of the dragons becoming Robians, while the rest went into hiding. After Dulcy the Dragon saved the surviving hiding dragons from Dr. Eggman, contact with the outside world was re-established, with Dulcy acting as the dragon's official liaison to the rest of Mobius. (StH: #155, #156)