The Luminary is a robotic support unit designed by the Kli'Flosis Tribe. It is used to support Protoss forces in the field of battle through the use of activated abilities. It also may 'attack' using a Chrono Disruptor, which slows a single target, be it on land or in the air.
The Luminary's effectiveness lies most notably in its ability to regenerate the shields of those around it at the cost of energy, allowing them to stay in the fight for longer periods of time. The Luminary also possesses the ability to place a special barrier of sorts over a target area. Although this "Null Field" does not impede movement, it does prevent enemy units from using most psionic and energy based abilities, as well as preventing cloaked units from remaining cloaked while in the field.