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Sentry SC2 Head1

A sentry

The sentry is a protoss support unit introduced in StarCraft II available early in the game. It was known as the nullifier[1] and then as the disruptor during development.[2]


Sentry SC2 Art1

A sentry

Used to support zealots[3] in light of the protoss race's diminishing population, sentries are protoss combat drones.[4] Sentries employ a disruption beam to attack their enemies,[5] and offer protection through guardian shields.

Sentries can also project force field barriers to stall or split up opposing forces.[5] This is done by turning bursts of energy into a small, impenetrable barrier to hinder, block, or funnel the advance of enemy troops. While creatures or machines of prodigious size can shatter the cohesion of these translucent force fields, ordinary soldiers and vehicles become fodder to protoss ranged weapons.[5]

Sentries also have the ability to create hallucinatory images[4] through an in-built holo-projector.[5] These holograms can draw enemy fire while a real protoss strike force maneuvers into position to deliver the killing blow.[4] These hallucinations are composed of solid light and are three-dimensional, able to mimic protoss warriors, vehicles, and constructs. Each replica, while limited in duration, is able to withstand some degree of punishment. The purpose of these life-like images is twofold: making the enemies of the protoss believe they’re fighting a much larger force than anticipated, and protecting protoss lives.[5]

By 2506, some sentries were being outfitted with portable shield batteries to better sustain the lives of protoss warriors in battle.[6]

Sentries had also been incorporated into the Tal'darim arsenal by 2504[7] and by the End War, they had developed their own variant.[6]

Game UnitEdit

Sentry SC2 Head1
Sentry SC2 DevRend1



Khalai SC2-LotV Logo1 Khalai


Energy manipulator unit


Disruption beam

Maximum energy

200 (init. 50) Energy Terran SC1





Sight range



50 Minerals Terran SC1


100 ProtossVespene SC2 Game1


2 ProtossSupply SC2 Icon1

Build time

26 Time SC2 Game1

Produced from

Gateway/Warp gate


Cybernetics core











Collision radius






Hit points



1 SC2ProtUpgrdGrndArm

Armor type


Disruption Beam


  • Ground
  • Air





+1 SC2ProtUpgrdGrndWeap





Kill score




The sentry has a beam which does continuous damage to one target.[8] 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.

Sentry/stalker combinations are common in mid-game scenarios.[9]


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

Creates a wall of energy at target point, pushing nearby units away and making the terrain impassible. Massive units and the mothership's Vortex ability remove Force Fields.

Force Field is smartcast.

Hotkey F
Cost 50 Energy Terran SC1
Duration 11Time SC2 Game1
Guardian shield
Guardian Shield

Sentries can create an aura which reduces incoming ranged damage to friendly units by 2.

Hotkey G
Cost 75 Energy Terran SC1
Range 4
Duration 11Time SC2 Game1

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 unit: gateway units spawn in twos, probes in fours, and all other units spawn one.

Hallucinations are instantly destroyed by psionic storm and are detected by detectors.

The sentry can create duplicates of units that the player doesn't meet the tech requirements for, but cannot make hallucinations of dark templar

As of Heart of the Swarm, hallucination no longer needs to be researched.

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; disruptor: D; adept: H)
Cost 100 Energy Terran SC1
Duration 43Time SC2 Game1
Purchased from

Cybernetics core (WoL)

Automatically available (HotS/LotV)
Hotkey H
Cost 100 Minerals Terran SC1 100 Gas Terran SC1 80Time SC2 Game1


Increases the armor of protoss ground units.

Purchased from Forge
Hotkey A
Level 1
Cost 100 Minerals Terran SC1 100 Gas Terran SC1 114Time SC2 Game1
Level 2
Cost 150 Minerals Terran SC1 150 Gas Terran SC1 136Time SC2 Game1
Level 3
Cost 200 Minerals Terran SC1 200 Gas Terran SC1 157Time SC2 Game1

Applies to zealots, dark templar, archons, adepts, stalkers, immortals, sentries and colossi.

Purchased from Forge
Hotkey G
Level 1
Cost 100 Minerals Terran SC1 100 Gas Terran SC1 114Time SC2 Game1
Level 2
Cost 150 Minerals Terran SC1 150 Gas Terran SC1 136Time SC2 Game1
Level 3
Cost 200 Minerals Terran SC1 200 Gas Terran SC1 157Time SC2 Game1
  • +1 armor to shields per level.
Purchased from Forge
Hotkey S
Level 1
Cost 150 Minerals Terran SC1 150 Gas Terran SC1 114Time SC2 Game1
Level 2
Cost 225 Minerals Terran SC1 225 Gas Terran SC1 136Time SC2 Game1
Level 3
Cost 300 Minerals Terran SC1 300 Gas Terran SC1 157Time SC2 Game1

Wings of Liberty CampaignEdit

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

Legacy of the Void CampaignEdit

In Whispers of Oblivion, the sentry gains a Shield Recharge ability, that functions similarly to the heal ability of the medic, restoring shields to a nearby protoss unit at an energy cost. The sentry cannot attack while using Shield Recharge. In the Legacy of the Void campaign, the sentry lacks Force Field, but the base sentries found in "Forbidden Weapon" have the Shield Recharge ability. The Aiur sentry can use Double Shield Recharge, allowing them to restore shields to two units.

The player may choose the energizer or havoc as sentry variants in the Legacy of the Void campaign. The sentry acts as a purely defensive support unit between Guardian Shield and Double Shield Restore, whereas the energizer and havoc can support the player's armies with more offensive-based abilities.


ShieldRecharge SC2-LotV Icon1
Shield Recharge

Restore 3 shields a second to an allied protoss unit at the cost of 1 energy per 3 shields restored. Can be set to autocast.

DoubleShieldRecharge SC2-LotV Icon1
Double Shield Recharge

Restore 3 shields a second to up to two allied protoss units at the cost of 1 energy per 3 shields restored. Can be set to autocast.



Force FieldEdit

Sentries can use Force Field to isolate enemy workers, preventing them from escaping their onslaught.[10] Force Field also proves to be very effective for splitting forces or preventing them from passing through choke points.[11] 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%
Sentry SC2 DevHead1

Development profile

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).


Main article: Sentry/Development



  1. 2009-05-08. Michael Graf. Starcraft 2 - Alle Einheiten (page 3). Gamestar. Accessed 2009-05-08.
  2. 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. StarCraft II General Discussion Forum. Accessed 2009-05-26.
  3. Races: Protoss. Blizzard Entertainment, accessed on 2010-08-07
  4. 4.0 4.1 4.2 Blizzard Entertainment staff. 2010-07-24. Units: Sentry Blizzard Entertainment. Accessed 2010-07-15.
  5. 5.0 5.1 5.2 5.3 5.4 2014-10-30, Sentry Science. Blizzard Entertainment, accessed on 2014-11-01
  6. 6.0 6.1 Blizzard Entertainment. StarCraft II: Legacy of the Void. (Activision Blizzard). PC. War Council interface (in English). 2015-11-10.
  7. Blizzard Entertainment. StarCraft II: Wings of Liberty (Activision Blizzard). PC. Mission:Wings of Liberty, Smash and Grab (in English). 2010-07-27.
  8. 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? StarCraft II General Discussion Forum. Accessed 2009-03-16.
  9. 2012-06-08, StarCraft II: Heart of the Swarm - Battle Report (Protoss vs Zerg). Blizzard Entertainment, accessed on 2012-06-21
  10. 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. StarCraft II General Discussion Forum. Accessed 2009-05-01.
  11. Dustin Browder, Robert Simpson, Yeon-Ho Lee, David Kim. 2009-06-22. Battle Report (3). Blizzard Entertainment. Accessed 2009-06-22.

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