The liberator was developed to ensure terran air superiority on the battlefield and was based off of the designs of the United Earth Directoratevalkyrie. An aerial counterpart to the siege tank, the liberator is a versatile, medium-sized gunship, armed with twin missile launchers to strike at clusters of aerial threats and can also deploy an anti-ground cannon after transforming into a stationary air platform. This cannon is strong enough to pierce even the armor of the Thor.
The liberator is introduced in Legacy of the Void. The liberator attacks in two mutually exclusive combat modes, switching from one to another and back is not instant (roughly 1 second). Each liberator in the selection is ordered to target an area (liberation zone) independently. Ordering them back to anti-air mode affects all selected liberators. Liberators cannot attack buildings.
In anti-air mode, the craft is mobile, and can only deliver multi-targeting anti-air splash attacks.
In anti-ground mode, a 5(9) diameter circle area on the ground is selected (not directly beneath the craft, but anywhere within 5(9) range); once an area is selected, the liberator is immobile and can only attack units within that circle, dealing very high single-target damage (enough to kill most ground targets in one to three shots). The circle can only be repositioned by switching back to anti-air mode, and then again to anti-ground.