The Sen'kaal Dominarchy is the government of the Sen'kaal. Relatively little is known about its structure, history or culture.
The Sen'kaal are ruled by a single leader, known as the Dominarch. It is unclear exactly how the Dominarch is selected. The Dominarch has final authority on all matters, and captured Sen'kaal records seem to suggest that he (or possibly she, although the only Dominarch that mankind has encountered was biologically a male) rules for life. The Dominarch can be deposed through a ruzh'kalat, or "ritual slaying," where the Dominarch's advisors, the Khulai, assassinate him. This is considered acceptable in Sen'kaal society. The Dominarch, upon accession to the position, abandons his name; and, for the remainder of his lifetime, is referred to by a number (for example, the twelfth Dominarch would become Dominarch 0012). Dominarchs are biologically different from all other castes, and it is believed that, in order to become Dominarch, a Sen'kaal must undergo biological and genetic modification. The procedures appear to result in the Dominarch-to-be losing their ability to tap into the Nexus.
The Vaktorians are the next most powerful beings in the Dominarchy, after the Dominarch and the Khulai. The Vaktorians appear to be biologically different from the other Sen'kaal castes, and are believed by many to be a different species that was assimilated into the Dominarchy due to their very high intelligence and ability to tap into the Nexus. UN intelligence reports seem to suggest that the Vaktorians serve as a "bridge" between the Dominarch and the rest of the Dominarchy. Dissections of Sen'kaal corpses seem to indicate that Nexus-sensitivity is not a natural feature of the Sen'kaal race, and that all Sen'kaal are crossbred with Vaktorian genes to make them Nexus-sensitive.
The Prakton are the military leaders of the Dominarchy and are appointed by the Dominarch. Each Prakton commands a War fleet. It is believed that at least five Prakton and their respective war fleets were involved in the assault on Earth.