The Black Dragon was forged over six years by the King of Hiden and awarded to Margo Glenfall at the tournament in Esleburg. When Drel used it to kill the dragon of the North that had crippled Margo, it absorbed the dragon’s soul and became a “divine treasure”.
The sword has an eye and can emit dark smoke, carve huge gashes in the earth, teleport Drel to where it lands and summon the skeletal Dead Dragon. Drel fused it with dark arts (“Dead Dragon’s Claw”) and used it to create the Devil Blood Prison. It was broken by the King’s Hammer, and Rhode Royes later fought with one of its broken fragments.