The sentry is a protoss support unit introduced in StarCraft II available early in the game. It was previously known as the disruptor,^[1] and nullifier before that.^[2]

Contents 1 Overview 2 Game Unit 2.1 Abilities 2.2 Upgrades 2.3 Wings of Liberty 2.4 Strategies 2.4.1 Force Field 2.4.2 Guardian Shield 2.5 Development 3 References

OverviewEdit

Used to support zealots^[3] in light of the protoss race's diminishing population, sentries are protoss combat drones. They are capable of deploying guardian shields, decreasing the effects of ranged enemy attacks. They can also project force field barriers to stall or split up opposing forces. Sentries also have the ability to create hallucinatory images that can draw enemy fire while a real protoss strike force maneuvers into position to deliver the killing blow.^[4]

Game UnitEdit

Sentry
Unit
Race	Protoss
Role	Energy manipulator unit
Armament	Disruption beam
Properties
Maximum energy	200 (init. 50)
Energy regen/second	0.5625
Transport size	2
Sight range	10
Production
Minerals	50
Gas	100
Psi	2
Build time	37 (32 second warp gate cooldown discount)
Produced from	Gateway/Warp gate
Requires	Cybernetics core
Hotkey	E
Movement
Speed	2.25
Acceleration	1000
Lateral acceleration	46
Deceleration	0
Collision radius	0.5
Protection
Shields	40
Shield regen/second	2
Hit points	40
Armor	1
Type	Ground Mechanical Psionic
Armor type	Light
Disruption beam
Damage	6
Targets	Ground Air
Cooldown	1
Range	5
Upgrade/level	+1
Function
Produces	Hallucinations
Meta
Target priority	20
Kill score	800
Production score	400

The sentry has a beam which does continuous damage to one target.^[5] Due to their high gas cost compared to stalkers, as well as their low HP and attack power, sentries are better being used as support units for other troops rather than frontline fighters.

Sentries are strong against mutalisks, zealots, and zerglings and weak against hellions, stalkers, reapers, and hydralisks.

AbilitiesEdit

For the terran-devised force field, see force field (terran).

Force Field
Acquisition Researched at Already researched	Usage Energy 50 Duration 15 seconds Hotkey F
Notes
Creates a nearly invincible "globe" over a small area that blocks the movement of ground units. Units caught under the shield when it is placed may escape but not reenter; while under the field they may attack and may be attacked.[6] Force Fields may be used to create walls and chokepoints to block or channel enemy units.[7] Stalkers may blink across the barriers. Reapers cannot jump across. Force Fields are removed by the mothership's Vortex ability, or by a massive ground unit walking over them. Force Field is smartcast.
Edit

Guardian Shield
Acquisition Researched at Automatically researched	Usage Energy 75 Range 4 (aura) Duration 15 Hotkey G
Notes
Sentries can create an aura which reduces incoming ranged damage to friendly units by 2.
Edit

Hallucination
Acquisition Minerals 100 Gas 100 Research time 80 Researched at Cybernetics core Hotkey H	Usage Energy 100 Duration 60 Hotkey C (archon: N; colossus: C; high templar: T; immortal: I; phoenix: X; probe: E; stalker: S; void ray: V; warp prism: A; zealot: Z)
Notes
Sentries produce false copies of units to distract opponents. Duplicates have the same number of hit points as the original but take double the damage. The number of hallucinations created depends on the actual cost of the unit. It can spawn 4 probes, 2 high templar, stalkers or zealots, or 1 archon, colossus, immortal, phoenix, void ray or warp prism. Hallucinations are instantly destroyed by psionic storm. The sentry can create duplicates of units that the player doesn't meet the tech requirements for. Hallucinations can be detected by detectors.
Edit

UpgradesEdit

Ground Armor Researched at Forge Hotkey A Properties Level Level 1 Level 2 Level 3 Minerals 100 150 200 Gas 100 150 200 Research time 160 190 220 Notes Increases the armor of protoss ground units. Edit

Ground Weapons Researched at Forge Hotkey G Properties Level Level 1 Level 2 Level 3 Minerals 100 150 200 Gas 100 150 200 Research time 160 190 220 Notes Applies to zealots, dark templar, archons, stalkers, immortals, sentries and colossi. Edit

Plasma Shields
Researched at	Forge
Hotkey	S
Properties
Level Level 1 Level 2 Level 3 Minerals 150 225 300 Gas 150 225 300 Research time 160 190 220
Notes
+1 armor to shields per level.
Edit

Wings of LibertyEdit

Sentries are not usable in the StarCraft II: Wings of Liberty protoss mini-campaign.

StrategiesEdit

Force FieldEdit

Sentries can use Force Field to isolate enemy workers, preventing them from escaping their onslaught.^[8] Force Field also proves to be very effective for splitting forces or preventing them from passing through choke points.^[9] Melee units may be blocked with force fields and attacked with ranged units.

Guardian ShieldEdit

Guardian Shield is most effective against attackers with low base damage: marines and mutalisks. Guardian Shield protects all ground and air units positioned over the horizontal circumference of the shield (where the shield joins the ground), even if a protected air unit is not visually within the "bubble" of the shield. However, the shield is centralized around the sentry, and units moving outside its area of effect no longer gain its benefits. This means that Guardian Shield is best used by keeping the sentry close to the rest of the player's forces. If the sentry is destroyed, the effects of Guardian Shield will instantly end.

The table shows the effective health for a defender protected by Guardian Shield. The figure assumes the defender has 1 base armor (as is the case with most protoss units), and defender and attacker both have 1 defense and attack upgrade. For example, the defender lasts 66% longer against marines if protected by guardian shield.

Attacker	Effective health of defending unit		Notes
	Non-Armored defender	Armored defender
Mutalisk	167%		Includes reduction from bounces
Marine	166%
Stalker	140%	116%
Marauder	129%	111%
Hydralisk	122%
Roach	114%
Immortal	111%	104%
Deployed siege tank	103%

The comparisons vary only 0-2% assuming attack and defense upgrade levels remain evenly matched.

The Guardian Shield bonus is applied after the immortal's Hardened Shield. Therefore, effective health of an immortal protected by Guardian Shield is at least 125% (higher if the attacker deals <10 damage before the Guardian Shield bonus is applied).

DevelopmentEdit

Main article: Sentry/Development

ReferencesEdit

↑ Well since you guys are so intently asking :) Yes, the Nullifier is known as the Disruptor now. Didn't want to bombard you guys with too many name changes at a time. There is still possibility of name changes moving forward as well. Karune. 2009-05-26. Nighthawk+HSM vs Mutalisk. Battle.net StarCraft II General Discussion Forum. Accessed 2009-05-26. ↑ 2009-05-08. Michael Graf. Starcraft 2 - Alle Einheiten (page 3). Gamestar. Accessed 2009-05-08. ↑ Races: Protoss. Blizzard Entertainment, accessed on 2010-08-07 ↑ Blizzard Entertainment staff. 2010-07-24. Units: Sentry Blizzard Entertainment. Accessed 2010-07-15. ↑ Only changes are balance changes, which will still continue to change. Otherwise besides that, the abilities are still the same. Hallucination still does not work on Carriers, Motherships, Dark Templars, an Observers. I'll have to get back to ya on the lore side :) maybe get them to post up a website update on that. The Sentry's weapon hits one target at a time, doing damage as long as the enemy is targeted. Karune. 2009-03-16. Karune: Has the Dark Pylon changed? Battle.net StarCraft II General Discussion Forum. Accessed 2009-03-16. ↑ They do not get pushed outside of the force field. If a unit is underneath a force field, when it exits the force field's radius, it will not be able to pass through the force field again until it dissipates. Units under the force field can fire out as well as be hit by enemy fire. Karune. 2009-03-16. Force Field. Battle.net StarCraft II General Discussion Forum. Accessed 2009-03-16. ↑ Pardo, Rob and Zetaras Xal'Kurat. 2008-06-29. WorldWide Invitational 2008: Pictures, Presentations, Videos (StarCraft II Panel: Evolving Design) SC2 Blog. Accessed 2008-06-30. ↑ In one of our Battle Report considered replays, I have actually seen 2-3 Nullifiers brought straight into the enemy resource line, then all exits force fielded so the enemy drones couldn't get out, and the Nullifiers pretty much killed a large amount of them easily since they get bonus biological damage. Karune. 2009-05-01. Worker harassment with Nullifiers. Battle.net StarCraft II General Discussion Forum. Accessed 2009-05-01. ↑ Dustin Browder, Robert Simpson, Yeon-Ho Lee, David Kim. 2009-06-22. Battle Report (3). Blizzard Entertainment. Accessed 2009-06-22.

Protoss Units and Structures of StarCraft II
Infantry	Probe · Zealot · High templar · Dark templar · Archon
Land mechanized	Stalker · Immortal · Sentry · Colossus
Air units	Warp prism · Observer · Phoenix · Void ray · Oracle (HotS) · Carrier (Interceptor) (WoL) · Tempest (HotS) · Mothership (WoL)
Basic buildings	Nexus · Assimilator · Pylon · Gateway (Warp gate) · Forge · Cybernetics core
Combat buildings	Photon cannon
Advanced buildings	Twilight council · Dark shrine · Templar archives · Robotics facility · Robotics bay · Stargate · Fleet beacon
Campaign-only units and structures	Units Scout · Star relic · Stone guardian Buildings Monolith · Obelisk
Canceled Protoss Units and Structures of StarCraft II