Centered in the city of Stormreach, DDO is set on the fictional continent of Xen'drik, in the world of Eberron, a Dungeons and Dragons campaign setting. Xen'drik is a vastly unexplored and wild locale, once the center of the Advanced Giant Civilization, which was destroyed thousands of years before. Players can create their characters following the revised edition of D&D 3.5 rule-set fashion, and play them in both indoor and outdoor environments, including dungeons.