Asgorath

Asgorath, also known as The World Shaper and The Red Corruption, was the creator of Dragons. Originally a peaceful deity intent on creation, Asgorath arrived on Aurus Elura and began his work. Some time later, Asgorath was corrupted by his own desires to carry on his work without limits. Several thousand before the Elder War, Asgorath lifted the island of Drakanstorm from the Great Ocean and corrupted the red Dragonborn, forcing them into his worship and experimenting endlessly on them. Forced to intervene, Elura slew Asgorath atop a collosal cathedral of his own making, destroying it in the process and liberating the enslaved Dragonborn.

Arrival on Aurus Elura
Much like the other Gods that have traversed Aurus Elura in the past, Asgorath arrived from an unknown previous location. He is believed to have arrived around 6,000 years prior to the Elder War and immediately began a campaign to birth his own perfect creatures, eventually shaping Dragonkind under the close eye of Elura. Impressed with his creations, Elura allowed the Dragons to inhabit the wild lands to the north of the Elven tribes (that would eventually become Vel'oran), in a land that would later become known as Coldreach. The first Dragons were born from chromatic colours. Red, Green, Blue, and Black. Later, hungry to create more, he then made White, Brown, Purple, Gray, and Yellow variants.

The Dragonborn
Some centuries later, Dragonborn arrived from another plane, exiled from where they once were. They were named for their similarities to Asgorath's Dragons, but were clearly different. For their similarities and Elura's loving nature, she allowed them to settle in Coldreach and they became allied with Asgorath's Dragons.