The Kobold Slave Revolts (non-narrative)
Kobolds didn't like being slaves. They revolted. A method for breaking the magical bond between a kobold and a dragon was found which allowed for traditional reproduction. Once dragons were severed from the process in creating more kobolds populations were able to form away from their former slaver's control and after several decades of bitter conflict the dragons largely left to live in the realms of magic although the full details of this transition are list to REDACTION.