Vex's disguise for his mission to the Vortian system.
VIR's Vortian disguise.
Vort's Solar System is home to 12 planets, two of which are gas giants with small planetoids orbiting around them. Invader Vex was given the mission to wipe out all resistance or refuge camps on the other planets in the Vortian System, along with his SIR unit: VIR.
Importance to the Irken Empire
The resistance camps had to be destroyed in order for no Escapees to be able to leak information about the Irken Armada, as Vort assisted the Empire design most of their starships and quite a bit of other technology.
Only one Vortian escaped Vex's sweep: Lard Narr, leader of The Resisty. Fortunately, Vex did not let him escape with any Irken blueprints or schematics, and Lard Narr was forced to work only with his memories when attacking The Massive in "Backseat Drivers From Beyond the Stars"
Methods for Conquering
Vex conquered the Vortian Resistance camps by first infiltrating them as a stranded alien on the run from the Irkens. He then located and destroyed all information that may have compromised the Irken Empire's safety by getting close to a few key people in the various compounds. After this, he destroyed all life support as well as transportation off the planets. He then flew around blasting buildings while Commander Thresh and a small group of Irken Special Operation troops went into the larger compounds, killing people or destroying life support systems until everyone had either suffocated or been shot.