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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]

Overview[edit | edit source]

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, and offer protection through guardian shields.[5] Sentries are able to move and levitate off of the ground through generators that create pockets of zero gravity.[6]

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 an protect allies via guardian shields, created by weaving light into a semi-solid state. Through this, the sentry can surround itself with an area-encompassing shield to safeguard protoss ground forces. Projectiles or energy blasts that penetrate the field lose some of their kinetic or thermal energy, and part of their effectiveness. Due to its considerable coverage radius, the guardian shield is not powerful enough to make much of a difference against larger types of ordnance.[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 lifelike 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 outfitted with portable shield batteries to better sustain the lives of protoss warriors in battle.[7]

A Tal'darim sentry

Sentries had also been incorporated into the Tal'darim arsenal by 2504[8] and by the End War, they had developed their own variant.[7] Nevertheless, some were left mostly unchanged, allowing for a varied array of robotic support and a certain degree of misdirection. Many Purifiers meanwhile retained sentries, in spite of their normal deployment of energizers. The Ihan-rii powered their sentries with volatile xel'naga relics called nebula wells.

After the End War, as part of an artistic movement calling back to the Golden Age of Expansion, some sentries were redesigned in the ancient styles of the era to complement vessels with longer histories.[9]

Game Unit[edit | edit source]

The sentry has a beam which does continuous damage to one target.[10] Their high gas cost relative to their low HP and attack power, delgates sentries 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.[11]

Wings of Liberty[edit | edit source]

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

Upgrades and Abilities[edit | edit source]
For the terran-devised force field, see force field (terran)
Force field.jpg
Force Field

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

Usage
Hotkey F
Cost 50 Energy
Duration 15 seconds
Cooldown 15 seconds
ve
Guardian shield.jpg
Guardian Shield

Sentries can create a radius 4.5 aura which reduces incoming ranged damage to friendly units by 2.

Usage
Hotkey G
Cost 75 Energy
Range 4
Duration 11 seconds
ve
Hallucination.jpg
Hallucination

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.

Usage
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 75 Energy
Duration 43 seconds
Acquisition
Purchased from

Cybernetics core (WoL)

Automatically available (HotS/LotV)
Hotkey H
Cost 100 Minerals 100 Vespene gas 80seconds
ve

Increases the armor of protoss ground units.

Acquisition
Purchased from Forge
Hotkey A
Level 1
Cost 100 Minerals 100 Vespene gas 129seconds
Level 2
Cost 150 Minerals 150 Vespene gas 154seconds
Required Twilight council
Level 3
Cost 200 Minerals 200 Vespene gas 179seconds
Required Twilight council
ve

Increases the attack of protoss ground units.

Acquisition
Purchased from Forge
Hotkey G
Level 1
Cost 100 Minerals 100 Vespene gas 129seconds
Level 2
Cost 150 Minerals 150 Vespene gas 154seconds
Required Twilight council
Level 3
Cost 200 Minerals 200 Vespene gas 179seconds
Required Twilight council
ve
  • +1 armor to shields per level.
Acquisition
Purchased from Forge
Hotkey S
Level 1
Cost 150 Minerals 150 Vespene gas 129seconds
Level 2
Cost 225 Minerals 225 Vespene gas 154seconds
Required Twilight council
Level 3
Cost 300 Minerals 300 Vespene gas 179seconds
Required Twilight council
ve

Legacy of the Void[edit | edit source]

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, and all three are highly viable.

Upgrades and Abilities[edit | edit source]
ShieldRecharge SC2-LotV Icon1.jpg
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.

Usage
Hotkey Q
ve
DoubleShieldRecharge SC2-LotV Icon1.jpg
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.

Usage
Hotkey Q
ve

Increases the armor of protoss ground units.

Acquisition
Purchased from Forge
Hotkey A
Level 1
Cost 100 Minerals 100 Vespene gas 129seconds
Level 2
Cost 150 Minerals 150 Vespene gas 154seconds
Required Twilight council
Level 3
Cost 200 Minerals 200 Vespene gas 179seconds
Required Twilight council
ve

Increases the attack of protoss ground units.

Acquisition
Purchased from Forge
Hotkey G
Level 1
Cost 100 Minerals 100 Vespene gas 129seconds
Level 2
Cost 150 Minerals 150 Vespene gas 154seconds
Required Twilight council
Level 3
Cost 200 Minerals 200 Vespene gas 179seconds
Required Twilight council
ve
  • +1 armor to shields per level.
Acquisition
Purchased from Forge
Hotkey S
Level 1
Cost 150 Minerals 150 Vespene gas 129seconds
Level 2
Cost 225 Minerals 225 Vespene gas 154seconds
Required Twilight council
Level 3
Cost 300 Minerals 300 Vespene gas 179seconds
Required Twilight council
ve

Co-op Missions[edit | edit source]

Zeratul has access to a variant of the sentry named the xel'naga shieldguard in Co-op Missions, with a similar campaign role of recharging allied shields.

Strategies[edit | edit source]

Force Field[edit | edit source]

Sentries can use Force Field to isolate enemy workers, preventing them from escaping their onslaught.[12] Force Field also proves to be very effective for splitting forces or preventing them from passing through choke points.[13] Melee units may be blocked with force fields and attacked with ranged units. Force fields can be broken by Massive units and ravager corrosive biles.

Guardian Shield[edit | edit source]

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.

Table

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).

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%

Development[edit | edit source]

Development profile

Main article: Sentry/Development

Achievements[edit | edit source]

Shroom absorption.jpg Shroom Absorption
Points

10 Achievement SC2 Game1.JPEG

Criteria

Absorb 1,000 damage with hallucinations in a single Unranked or Ranked game.

Edit
JustAnIllusion SC2 Icon1.jpg Just An Illusion
Points

10 Achievement SC2 Game1.JPEG

Criteria

Control 15 hallucinations at once in a Melee game.

Edit

Variants[edit | edit source]

Images[edit | edit source]

Skins
Portraits

References[edit | edit source]

  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. Battle.net 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 5.5 2014-10-30, Sentry Science. Blizzard Entertainment, accessed on 2014-11-02 Cite error: Invalid <ref> tag; name "SentryScience" defined multiple times with different content
  6. Zahn, Timothy (November 8, 2016). StarCraft: Evolution. Del Rey Books. ISBN 0425284735.
  7. 7.0 7.1 Blizzard Entertainment. StarCraft II: Legacy of the Void. (Activision Blizzard). PC. War Council interface (in English). 2015-11-10.
  8. Blizzard Entertainment. StarCraft II: Wings of Liberty (Activision Blizzard). PC. Mission:Wings of Liberty, Smash and Grab (in English). 2010-07-27.
  9. Blizzard Entertainment. StarCraft II: Legacy of the Void. Collections Tab: Skins. July 19, 2017
  10. 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.
  11. 2012-06-08, StarCraft II: Heart of the Swarm - Battle Report (Protoss vs Zerg). Blizzard Entertainment, accessed on 2012-06-21
  12. 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.
  13. 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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