Cloaking Field
Source: Control Tower
Minerals: 150
Vespene Gas: 150
Research Time: 100
Mana: 25
This ability is very similiar to the Ghost's cloaking. Cloaking will make the Wraith invisible and unattackable, unless there is a nearby detector to expose it. If they do get exposed, it is best to flee because they will fall fast due to their low health. Cloaking consumes a small amount of mana initially and also uses a small amount while cloaked as well. A Wraith with full mana can cloak for several minutes, but be sure to return to a safe place when its mana gets low.
With this ability, it makes the Wraith effective at harassing the enemy and attacking its weak points rather than a frontal assualt. Although attacking ground units while cloaked will work, the damage is so small it generally isn't worth the effort. It is capable of destroying entire air forces simply by destroying the enemy's detector units first, then finishing off the rest of the fleet. A common tactic is to send some wraiths over to the enemy resources and destroy the harvesters.