For a thousand years the dragonborn served with distinction. As their population grew, they spread across the region. Another thousand years passed, and the young grew frustrated. They were a race of warriors waiting for a battle that might never come. Their skills were wasted, and the dragon lord of Haka’torvhak had little interest in their doings. Rhashaak’s attention was confined to his city and to a spiritual battle no dragonborn could understand.
So the dragonborn ventured across the Endworld Mountains and into the plains that lay beyond. There they encountered a worthy challenge in the Empire of Dhakaan. Another thousand years passed as the dragonborn carved out their nation in the Blade Desert and Talenta Plains, the tides of the Goblin Wars waxing and waning. There were great triumphs and terrible defeats. It was a joyful time for a people who thrived in battle. But in building this new empire, they forgot the battle they’d been sent to fight, and this finally came back to haunt them.
In Haka’torvhak, Rhashaak had been holding the fiend Masvirik at bay through sheer force of will, until he finally faltered. The wards around Haka’torvhak trapped Rhashaak himself. While the fallen guardian couldn’t leave the fortress, the influence of the Cold Sun spread across the land and the Poison Dusk was born. Kobolds, troglodytes, and the transformed dragonborn of Haka’torvhak rose up in arms. Across the empire, young dragonborn corrupted by Masvirik’s power turned on their kin. As the empire collapsed, the dragonborn returned to Q’barra to face the source of the curse. The dragonborn fought valiantly, but it wasn’t a battle that could be won with courage or skill at arms alone. To this day, the dragonborn themselves don’t realize the true source of their salvation.
The couatl that bound Masvirik left a failsafe in place. As the overlord’s power grew, a pulse of radiant energy flowed across the land, filling Eberron dragonshards with the light of the Silver Flame. This power weakened the influence of Masvirik and the Poison Dusk and woke ancient memories in the lizardfolk. This was the creation of the dawn shards, and this web of light has kept the darkness at bay for thousands of years. Now House Tharashk is harvesting these shards in record numbers, and Masvirik’s power is growing once more.
Source: Dungeon 185
All dragonborn trace their origin to the continent of Argonnessen, where they were created as soldiers in the endless wars against the forces of Khyber. While most dragonborn still live on that continent and the neighboring isle of Seren, significant populations of dragonborn have been deposited around the world to guard ancient sites.
Over ten thousand years ago, a black dragon named Rhashaak led several legions of dragonborn from Argonnessen to guard the ancient ruins of Q’barra. Rhashaak claimed the fiendish city of Haka’torvhak for himself and the Trothlorsvek (“Defenders of Prophecy”) clans took up positions at various other fiendish ruins scattered throughout Q’barra.
Over time, Rhashaak grew singularly focused upon the prophetic and spiritual demands of Haka’torvhak. Meanwhile, the Trothlorsvek clans grew bored and began dreaming of an empire they called Arkhosia. They expanded beyond Q’barra into the neighboring Talenta Plains where they encountered the goblinoid armies of Dhakaan and waged war across the halfling’s grasslands.
The dragonborn empire was expanding when disaster struck. The dragon lord Rhashaak was corrupted by Masvirik’s fiendish power, transforming the dragon who then sent tides of servants to establish a new empire loyal to him. The threat of Rhashaak’s new army, the Poison Dusk, spurred the legions of dragonborn fighting the Dhakaani to return to confront their traitorous kin. The war was long and hard, ultimately costing the dragonborn their empire, but they succeeded in trapping Rhashaak in the accursed city of Haka’torvhak, where he dwells today. Unable to fully defeat the dragon, the dragonborn chose to remain in Q’barra, guarding the same ancient ruins they always have. Their empire remains fallen, as every attempt to rebuild it is met with a surge of traitors who abandon their duty and side with Masvirik.