The Dwarven Empire is the secret goal of the wars started by the Dwarves. It is a world in which the Dwarves rule over the other humanoids species with absolute power and control.
The dream of the Dwarves to rule over all was started by their 104th king, Don Jagg III he felt that relations with the Orcs would only become worse over time so he began planning a scheme of domination over them. This was called the Dwarven Empire. This dream was shared between most of the Dwarven kingdom, and the kings that followed him carried forth his dream.