Sentry

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

Game Unit
The Nullifier is a mechanical hovering ground unit and has 100 energy points. It has an attack similar to the Terran Marine's.

It is produced from the Gateway and requires a Cybernetics Core. It costs 50 minerals and 100 Vespene gas.

Abilities

 * Force Field
 * Energy 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.
 * Null Void
 * Energy Cost: 50
 * Prevents any unit caught in the target area from using abilities. The effect lasts 15 seconds. Units that move out of the field immediately can immediately use their abilities.

Development
The Nullifier was previously known as the Stasis Orb. The Force Field ability was used by the High Templar in earlier builds of StarCraft II.