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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]

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
Sentry SC2 Head1
Sentry SC2 DevRend1
Unit
Race

Protoss

Role

Energy manipulator unit

Armament

Disruption beam

Properties
Maximum energy

200 (init. 50) Energy Terran SC1

Energy
regen/second

0.5625

Transport
size

2

Sight range

10

Production
Minerals

50 Minerals Terran SC1

Gas

100 ProtossVespene SC2 Game1

Psi

2 ProtossSupply SC2 Icon1

Build time

37 (32 warp gate cooldown) Time SC2 Game1

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 SC2ProtUpgrdGrndArm

Type
Armor type

Light

Disruption beam
Damage

6

Targets
  • Ground
  • Air
Cooldown

1

Range

5

Upgrade/level

+1 SC2ProtUpgrdGrndWeap

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.

Sentry/stalker combinations are common in mid-game scenarios.[6]

AbilitiesEdit

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

Already researched

Usage
Energy

50 Energy Terran SC1

Duration

15 seconds Time SC2 Game1

Hotkey

F

Notes

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 Guardian Shield
Acquisition
Researched at

Automatically researched

Usage
Energy

75 Energy Terran SC1

Range

4 (aura)

Duration

15 Time SC2 Game1

Hotkey

G

Notes

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

Edit
Hallucination Hallucination
Acquisition
Minerals

100 Minerals Terran SC1

Gas

100 Gas Protoss SC1

Research time

80 Time SC2 Game1

Researched at

Cybernetics core

Hotkey

H

Usage
Energy

100 Energy Terran SC1

Duration

60 Time SC2 Game1

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.

In Heart of the Swarm, Hallucination does not need to be researched.[8]

Edit

UpgradesEdit

SC2 ProGrndArm Ground Armor
Researched at

Forge

Hotkey

A

Properties
Level

Level 1

Level 2

Level 3

Minerals

100 Minerals Terran SC1

150 Minerals Terran SC1

200 Minerals Terran SC1

Gas

100 Gas Protoss SC1

150 Gas Protoss SC1

200 Gas Protoss SC1

Research time

160 Time SC2 Game1

190 Time SC2 Game1

220 Time SC2 Game1

Notes

Increases the armor of protoss ground units.

Edit
SC2 ProGrndWeap Ground Weapons
Researched at

Forge

Hotkey

G

Properties
Level

Level 1

Level 2

Level 3

Minerals

100 Minerals Terran SC1

150 Minerals Terran SC1

200 Minerals Terran SC1

Gas

100 Gas Protoss SC1

150 Gas Protoss SC1

200 Gas Protoss SC1

Research time

160 Time SC2 Game1

190 Time SC2 Game1

220 Time SC2 Game1

Notes

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

Edit
SC2 ProShields Plasma Shields
Researched at

Forge

Hotkey

S

Properties
Level

Level 1

Level 2

Level 3

Minerals

150 Minerals Terran SC1

225 Minerals Terran SC1

300 Minerals Terran SC1

Gas

150 Gas Protoss SC1

225 Gas Protoss SC1

300 Gas Protoss SC1

Research time

160 Time SC2 Game1

190 Time SC2 Game1

220 Time SC2 Game1

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.[9] Force Field also proves to be very effective for splitting forces or preventing them from passing through choke points.[10] 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).

DevelopmentEdit

Main article: Sentry/Development

ReferencesEdit

  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. Blizzard Entertainment staff. 2010-07-24. Units: Sentry Blizzard Entertainment. Accessed 2010-07-15.
  5. 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.
  6. 2012-06-08, StarCraft II: Heart of the Swarm - Battle Report (Protoss vs Zerg). Blizzard Entertainment, accessed on 2012-06-21
  7. 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.
  8. Cloaken. 2012-10-12. Balance Update #6 (10/12/2012) Heart of the Swarm Beta Discussion. Accessed 2012-10-12.
  9. 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.
  10. 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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