Sentry

The nullifier is a protoss support unit introduced in StarCraft II available early in the game. It is also known as the disruptor.

Overview
The nullifier was seemingly designed by the Dark Templar.

Game Unit
The nullifier had a base attack similar to the terran marine's. The attack resembles a brightly-colored beam. The beam has been recently changed to one resembling the original attack of the colossus. The beam does continuous damage to one target.

Strategies
Nullfiers can use Force Field to isolate enemy workers, preventing them from escaping their onslaught. Nullifiers deal bonus damage against biological units, making this a particularly effective tactic against drones.

Development
The nullifier was previously known as the stasis orb. The Force Field and Anti-Gravity abilities were used by the high templar in earlier builds of StarCraft II. Anti-Gravity was later moved to the Phoenix.

In earlier builds, Anti-Gravity could affect destructible doodads, but this was a bug.

Earlier builds featured an ability called Null Void.


 * Null Void
 * Ability Cost: 50
 * Prevents any unit caught in the target area from using abilities that cost energy. It does not affect abilities such as a stalker's Blink, a carrier's Build Interceptor, a Phoenix's Overload or an SCV's Repair. Units that move out of the field immediately can immediately use their abilities.
 * Nullify acts as a detector, decloaking units such as ghosts and dark templar and revealing burrowed units. The ability to detect cloaked and burrowed units is currently being subjected to balance testing.
 * The effect lasts 15 seconds.

As of February 2009 the nullifier lost the Molecular Disruption ability.

Trivia
The nullifier resembles a trilobite.