The Protoss have learned to generate force fields over small areas in clusters to effectively block paths to hold up enemy ground threats. A unit found inside a force-field can exit it – but cannot move across it once on the outside.

As another feat of power of the Nullifier, they can reverse the gravitational field at a targeted location to cause whatever units or buildings present there to lift up into the air. This formidable ability would be used to dislodge, for example, Supply Depots blocking the path into a Terran base and allow a full Protoss force to charge in and wreck havoc.

The Null Void prevents anything or anyone caught within its area of effect from making use of energy-requiring abilities.

Increase the damage of ground units.

Increases the armor of Protoss ground units.

Increase shields of ground and air units.