Sentry

The Nullifier is a Protoss support unit introduced in StarCraft II available early in the game.

Overview
It appears that the Nullifier is a craft designed by the Dark Templar.

Game Unit
The Nullifier has a base attack similar to the Terran Marine's. The attack resembles a brightly-colored beam. However, the beam has been recently changed to that resembling the original attack of the Colossus.

Abilities

 * Force Field
 * Already researched
 * Ability Cost: 30
 * Creates an invincible "globe" over a small area that lasts 15 seconds that blocks the movement of ground units and melee attacks. Units caught under the shield when it is placed may escape. The Colossus may step over the shield.
 * Force Fields can create artificial choke points to channel enemies. This is particularly potent against melee attackers such as Zerglings, since some might not be able to reach the Protoss forces.
 * Force Fields can create walls, which Stalkers can blink across, attacking enemies from relative safety.
 * The render of the Force Field has been redesigned to resemble Stasis field of the Arbiter.
 * Anti-Gravity
 * Already researched.
 * Ability Cost: 50
 * Anti-Gravity can lift enemy units and structures (such as the Supply Depot) into the air, preventing them from moving and attacking, and rendering them as air targets. Even tall units like the Colossus will become an air unit and will lose the ability to attack, while buildings that have been lifted will lose special properties (such as a Pylon's ability to power nearby structures) and will pause in researching. It does not work on resource-collecting structures such as the Nexus. The ability is channeled, which means that the Nullifier using the ability should not perform any other action (such as movement) while using the ability if it is to continue. The effect lasts 12 secons.
 * Zerg structures removed from the Creep will not take damage while they are being lifted.
 * Burrowed Zerg units will be unburrowed by the ability, and will reburrow when they fall back to the ground.
 * Anti-Gravity can be used on allied units as well as on the enemy.

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.

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.