The Dominion of Air and Darkness is a Monarchy formed in the RE-524 Galaxy, when a human female was turned into an energy being by Iconian Technology. Now able to control the technology, but becoming mentally unstable, she renamed herself Li'Asha and expanded her borders, taking in multiple other races and technologies (including a race that was cloned, and the mindless clone being used for Li'Reva's body), until the Dominion began clashing with the Imperium of Reclamation.
The war between the Dominion and Imperium began in 1583, and has gone on since, neither side budging.