Eberron: Dawn of Heroes
Born from the strife of the Last War, warforged remain as constant reminders of that terrible time. To look upon one is to see an instrument of destruction, a heartless killing machine, a siege engine in the shape of a man. Despite the purposes for which House Cannith built them, however, warforged can choose to be peaceful. When given thinking minds, warforged were granted the ability to surpass the limited uses for which their creators had designed them.
When peace finally came, the nations of Khorvaire agreed to free the warforged, granting them their first opportunity to make their own choices. Although tireless creations, the warforged had long ago become tired of war and chose to live among the other races. Unlike other veterans of the Last War, however, the warforged have never known peace and have no homes to which to return. The warforged thus live uneasily among the other races of the world, seeking to create a place for themselves in unwelcoming lands.