Kaosa

Kaosa (which means "rose" in Draconic dialect) was once a human being during the prehistoric era of what would become known as Earth - she was the first human to form a close bond with a dragon, in the form of Dusk, and it was this dragon that gave her the name she would keep to this day.

Through contact with Dusk Kaosa evolved much further than the rest of humanity, who were still in the primitive hunter-gatherer stage of evolution - barely able to communicate past a few grunts (though they were social and had began to form very basic communities).

Kaosa knew that humanity wasn't ready to see a creature like Dusk and despite his desire to be with her he accepted that she was correct - however tragedy would strike when Dusk was slain by a tribe of savage hunters (secretly informed of Dusk's location by the ancient Ebonscale).

Kaosa was horrified and rushed to the side of her dying companion, unable to withstand the grief she pledged herself to the Twilight Force - despite Dusk's warning - within moments she began to transform as the Force overtook her, stripping away her humanity as her rage and misery altered her body and mind into that of the Brood-Mother.

Kaosa ravaged the land, killing many people and installing a fear of dragons into the minds of humans that would remain for centuries to come - then she fled into the Twilight-Realm and began her centuries-long struggle to destroy humanity and spread the Twilight Dragon-Flight across the stars.