Protoss gameplay (StarCraft)

Gameplay attributes

 * High cost per unit produced
 * High unit power
 * High supply consumption per unit
 * Very powerful special abilities (the Psionic Storm is often referred to as the "most powerful special ablilty in the game").
 * The only race with plasma shields.

During the Aeon of Strife, some Protoss warriors used focused psionic energy to surround themselves in impregnable energy shields. Over time, Conclave scholars and Templar sages learned to reproduce the energy shield using induced psi-field generators, which allowed even the smallest robotic machine to surround itself with a protective field.

All Protoss military units (including buildings) have shields; when damaged, shields regenerate over time, even faster than Zerg units heal. Shields, however, always take full damage (see Damage types). Shields are instantly drained by the Terran Science Vessel's EMP ability. Shields on all units can be regenerated almost instantly by the Protoss Shield Battery structure. However, they are unable to heal damage sustained when their shields have been depleted.


 * Protoss structures, like their units, cannot be repaired of damage sustained while the shields were down (exception to this is a Terran medic healing a non-mechanical Protoss unit)
 * Fastest building method, moderate building location restrictions (Pylons)

Protoss structures and units, to a lesser extent, draw their energy from a great psionic energy matrix that emanates from Aiur. While the Nexus provides a link to this matrix, Khaydarin Crystal-based Pylons are needed to actually tap into the energy required to provide psionic energy to new colonies. Each Pylon generates a short-ranged aura of energy, which can provide the power needed by structures and warp gates. If a Protoss building loses its connection to the Psionic Matrix, it will shut down until it is reconnected, and new units cannot be gated in if there is insufficient psionic energy to provide them with power.

The most technologically advanced race in the game, the Protoss field relatively small but very powerful armies. Their units cost much more than those of the Terran or Zerg, and require more supply, but are far more powerful than the equivalent units of those races. Their shields also serve as a replaceable buffer of health. The Protoss builder unit, the Probe, does not actually build structures but instead warps them in from Aiur; once the Probe has finished opening the warp gate, it can walk off and begin mining, or even warp in more buildings as the first building warps in.

The Protoss's major downfall is their high cost; a Protoss player without a strong economy is essentially doomed, and it is a small economic disaster if they lose even one unit (as opposed to, say, the Zerg, who throw away their soldiers with impunity). The Protoss also have a weakness no other race has, in the form of their Pylons. Pylons are specialized buildings that project an energy field, symbolized onscreen as a transparent blue circle; all Protoss buildings require this field to function. Pylons are relatively durable (300 shield points and 300 Hit Points), but they are still the easiest thing in a Protoss base to destroy, with the added effect of 'unplugging' all the Protoss's home appliances and factories. A concentrated assault on Pylons, in other words, can bring Protoss production to a halt; and, since Pylons also provide Supply, those buildings that remain 'plugged in' still may not be able to produce more units until the Supply limit is restored.

Land units

 * Probe &mdash; builder unit. Most effective builder unit as it is not consumed upon creation of a structure (Zerg drone) and does not need to remain at the structure to construct it (Terran SCV). It is tiny and, therefore, is manueverable and can take up small spaces. Attack power is not upgraded.
 * Zealot &mdash; primary attack unit. The Zealot is a melee attacker, wielding a pair of psionic blades, and is much stronger than the primary attack units of the Zerg and Terran. Can be upgraded for faster movement speed. It is incapable of attacking air units.
 * Dragoon &mdash; ranged attack ground unit that deals moderate damage that is most effective against large targets. Dragoons are especially vulnerable to Zerg players, as the Spawn Broodling special ability and swarms of zerglings can take them out easily. The dragoon can be upgraded for longer range. It also has the capability to attack air units.
 * Reaver &mdash; siege unit. It is both the slowest siege unit and the most powerful. Unlike most other units, it does not have unlimited ammunition. Instead, it constructs "scarabs". It has an initial capacity of 5, but can be upgraded to 10. Each shot uses up one Scarab. Note that the Scarabs move along the ground toward their targets; while they will circumnavigate obstacles if possible, they need a relatively clear path. If a target is within range but directly blocked by a wide obstacle such as several lined mineral fields, the Scarab will detonate regardless after approximately five seconds of high-speed attempted circumnavigation. The reliance on scarabs and its slow speed are the Reaver's main weaknesses. However, the high damage, splash effect and normal damage type makes it very powerful against groups of weak units such as Zerglings or Marines, and the long range can be used to take out defensive structures without fear of retaliation, although it lacks the range of the Terran Siege Tank. The Reaver can be upgraded for higher Scarab capacity and higher Scarab damage. The slow speed of reavers is also often compensated for by pairing them closely with shuttles, particularly with the speed upgrade, keeping the shuttles close to the reavers during combat operations and repeatedly unloading and reboarding the reavers in response to enemy action.
 * High Templar &mdash; primary caster. High Templars cannot attack and are rather slow and weak. However, their special abilities make them powerful support units.
 * Hallucination &mdash; Creates two copies of a target unit. Enemies cannot distinguish hallucinations from real units directly. However, hallucinations do no damage when they attack, cannot use special abilities, and take double damage. Hallucinations disappear if they are "killed" or once their energy runs out. This can be used for decoys or for intimidation. Hallucinations also immediately disappear when special abilities (target specific or area effect such as Stasis Field or EMP) hit them for some sort of effect or damage, even when the units are at full health.  Must be researched at the Templar Archives.
 * Psionic Storm &mdash; considered by many to be the most powerful special ability in the game. Psionic Storm covers an area with crackling electricity. Any units in the area, both friendly and enemy, take damage for each second that they stay in the field. This is extremely effective against slow-moving units like the Reaver or Siege Tank or against large groups of small units like Zerglings. Psionic Storm does not stack; that is, multiple storms cast over the same area at the same time do not combine effects. Must be researched at the Templar Archives. Psionic Storm has, since Starcraft's initial release, been downgraded in power several times via patches to the game.
 * Archon Warp &mdash; only available when two or more High Templar are selected at one time. The Templar merge in pairs to create Archons. This does not consume any mana; however, the merging takes some time during which the High Templar are vulnerable. The meld is irreversible, so the High Templar and their abilities are irretrievably lost.
 * Archon &mdash; Archons are created when two High Templar merge. They have a powerful ranged attack that deals splash damage, and have a powerful shield that can withstand a large amount of damage. However, they have very few hit points, so a Terran EMP will bring them to near-death. Archons are immune to both Irradiate and Terran Vultures' Spider Mines, and are almost unaffected by Plague (it lowers their HP to 1 without damaging their shields).
 * Dark Templar &mdash; stealth unit with permanent cloaking ability (no cloaking special ablility or energy points required), opponent requires units with detector ability (e.g. Terran Science Vessel) to see it. It has powerful attack but relatively low hit points and shields. They are an extremely effective harassment and assault unit. (StarCraft: Brood War only)
 * Dark Archon &mdash; caster, no non-special ability attack, formed from two Dark Templar. Its abilities include mind control, which allows you to take control of an enemy unit at cost of energy. This can even be used to take control of another race's worker unit, allowing you to build that race's tech tree. Of course, this is expensive and not always cost-effective. You can also mind control an enemy shuttle unit and take control of not only the shuttle but all units inside of it as well. The other two abilities are feedback and maelstrom. Maelstrom freezes all biological units in the radius of attack for a short period of time. Feedback is used to kill other energy using units by draining their energy and then using it as a physical assault to damage or kill the target unit (this may even be used on Battlecruisers because they use energy to power the Yamato Cannon). The damage dealt by Feedback in pure hit points is equal to two times the amount of energy the target unit had when Feedback was cast upon it. (StarCraft: Brood War only)

Air units

 * Shuttle &mdash; flying transport unit. After its speed is upgraded it is the fastest transport unit in the game. It can carry up to eight unit slots. (Each unit takes up a different number of slots; probes take up 1, zealots, dark templar, and high templar take up 2, and dragoons, archons, dark archons, and reavers take up 4.)
 * Scout &mdash; Heavy fighter craft. Speed and sight range upgrade at Fleet Beacon. A fleet of scouts can even defeat the heaviest of air units, making them extremely deadly units. However, scouts can be quickly dispatched if they are hit with EMP. Scouts are ineffective against ground units, but can make good harassers.
 * Arbiter &mdash; caster; all nearby units belonging to the player with the Arbiter except other Arbiters become cloaked without cost. Can cast stasis field that freezes all units for a set amount of time. No health or energy points can be lost or gained during stasis.  No other abilities can affect units, including the undoing of the stasis field. Can also cast recall, which transports a player's units to the vicinity of the arbiter almost instantaneously. They can recall locked down units but cannot recall units in stasis. Special ability and energy point upgrades at Arbiter Tribunal.
 * Carrier &mdash; heavy air unit. The carrier attacks by launching Interceptors, each of which built at the cost of 25 minerals. Carriers start the game able to hold four interceptors, but an upgrade at the Fleet Beacon increases the capacity to eight. The Interceptors give the Carrier the longest range of any Protoss unit, comparable with the Terran Siege Tank and the Zerg Guardian. Carriers are most vulnerable to the Zerg Scourge and Devourers as well as Protoss Scouts that are properly defended. They are one of the most powerful units in the game, but can be taken down easily by a skilled player if not defended properly.
 * Observer &mdash; flying scouting unit. Detector unit. Observers are permanently cloaked and thus visible only to other detectors. Observers have no attacks or abilities, and have few hit points. The speed and sight range of Observers can be upgraded at the Observatory.
 * Corsair &mdash; caster and light fighter with a rapid-fire low damage splash attack usable against air targets only. The Corsair can cast Disruption Web, which prevents all land units (friendly and otherwise) and defensive buildings within the web from firing or operating. Units and buildings in the Disruption Web can be targeted for attacks and special abilities. The disruption field cannot be undone until the spell wears out. Corsair upgrades to abilities and energy points are available at the Fleet Beacon. (StarCraft: Brood War only)
 * The original corsair, appearing on an original edition Brood War CD, has a disruption web with a very long persistence. The first patch (and later patches) for Brood War, incorporated in later edition CDs and a required download for play on the Battle.net, dramatically reduces the persistence time of the disruption web from that original setting. This was done in response to original edition Brood War games on Battle.net in which it quickly became apparent that the Protoss enjoyed a brutal advantage if they accumulated mass corsairs, with which they could essentially douse an enemy base with disruption webs that - at least when a second round of webs were deployed - stayed in place typically until everything under them was destroyed. This was most striking in the case of an all-aerial assault of corsairs and carriers; when done right, the carriers could simply come in and park over a screen full of disruption webs, with any opposing air units quickly dispensed with, and with the enemy base in utter ruins, if not completely destroyed, by the time the disruption webs finally wore off.
 * The Corsair was developed by Dark Templar during their wandering exile from Aiur in order to protect their Xel'Naga freighter, and has since been adapted as an anti-Zerg weapon.

Buildings
All buildings must be built in the vicinity of a Pylon except for the Nexus, Assimilator and other Pylons. All buildings that do not have an completed pylon required for operation will cease all operations, including upgrades, unit training, magic point restoration, and attack.

Basic buildings

 * Nexus &mdash; provides 9 Psi, resource depot, starting point of technology tree, produces Probes
 * Assimilator &mdash; collects Vespene gas
 * Pylon &mdash; creates 8 Psi each, powers buildings
 * Gateway &mdash; summons infantry units
 * Forge &mdash; upgrades ground weapons and armour, as well as plasma shields which applies to all units and buildings
 * Shield Battery &mdash; rapidly recharges shields at the cost of 1 energy per 2 shield point
 * Cybernetics Core &mdash; upgrades Protoss Dragoons range and spacecraft weapons and armour
 * Photon Cannon &mdash; all-purpose detector defensive structure

Advanced buildings

 * Robotics Facility &mdash; Used to warp in the Protoss robotic units
 * Stargate &mdash; Used to warp in the Protoss air units
 * Citadel of Adun &mdash; Required for the Templar Archives, and contains a Zealot movement upgrade
 * Robotics Support Bay &mdash; Required for the Reaver, and contains upgrades for the Shuttle and Reaver
 * Fleet Beacon &mdash; Required for Carriers, and contains upgrades for the Carrier, Scout, and Corsair
 * Templar Archives &mdash; Required for warping in the Arbiter, High and Dark Templar, and both types of Archon. Also contains upgrades for the High Templar and Dark Archon
 * Observatory &mdash; Required for, and upgrades the Observer
 * Arbiter Tribunal &mdash; Required for, and upgrades the Arbiter

Strategy
There are many different strategies for Protoss, highly dependent on the stage of the game:

Opening Strategies

 * Zealot rush &mdash; during the initial stage of the game (1 min or so into the game), rush into the enemy's base with at least 4 Zealots. If your forces have an obvious superiority over the enemy, destroy their base as a whole. If not, try disrupting their mining operation as much as possible to cripple your enemies' abilities to retaliate in the long run. This is often done by setting the zealots to move straight to the resource collection area to attack the resource gatherers, after running by and typically taking nominal damage from enemy forces concentrated in a front area of the base. A common mistake of amateurs is to try to run the zealots through in attack-response mode, so that any engagement by a frontal defense at the base distracts the zealots into battling the defending units, leaving the resource gatherers to continue their work unimpeded.


 * Dark Templar rush &mdash; This tactic involves a rush of Dark Templar, typically 1-3 for an early game edge. Works very well against Terran; also works very well against Protoss if the enemy does not yet have any cannons, though even a single cannon, allowing other combat troops to attack, often effectively neutralizes a dark templar rush; and is not likely be successful against the Zerg. This strategy is high-risk because it requires the user to ignore defense and early game units, and tech straight towards Dark Templars, if there is to be a realistic chance of catching a Protoss or Terran opponent before they have detection capabilities. Because of this, the dark templar rush, like other high-risk opening strategies, is only safely done by coordinating with at least one teammate who agrees to pursue a more fundamental opening strategy of high-volume, low-tech troop production sufficient to defend both bases. Otherwise, any competent opponent who manages to deflect the dark templar rush and find your base quickly should have a decisive advantage. Dark Templar are permanently cloaked and deal a high amount of damage. Just a couple of these can easily wipe out an entire mineral line or take out a single Turret or Comsat Station to further avoid detection without loss.


 * Early cannon rush &mdash; This strategy takes a lot of speed and luck. In some Starcraft maps, such as the popular Big Game Hunters, the mineral fields of certain starting positions contain a pocketed area behind the mineral field with a single tiny entrance, small enough that a Probe may seal itself in by constructing a Pylon at the entrance of the pocket. It may then warp in one or two Photon Cannons as a Forge is completed back at the base. The cannons' positions make them impossible to reach without first destroying the Pylon, which has a combined total of 600 points in shields and structure. This usually occurs in the first three minutes of the game, so the aggressor is almost always left completely defenseless at home. Most of the time, however, the defender has not had enough time to set up proper unit production, and if the cannons are warped in without the Pylon being destroyed quickly, the nexus of the defender is at risk of being destroyed, which may prevent the player from mining any more minerals (if they do not have the 400 minerals required for a second Nexus), essentially taking them permanently out of the game. Counters to this include the construction of Sunken Colonies or Bunkers near the mining areas.


 * Standard cannon rush &mdash; This tactic involves building Photon Cannons just near the enemy's base, so that (if properly positioned) they can attack the foe's soldiers and factories. Because the Zerg factory is its Hive, this tactic doesn't work on them (the Creep also gets in the way), but against Terrans or the Protoss itself, just two or three properly-positioned Photon Cannons will end the game, destroying factories and allowing you to build another row of cannons with which to further advance.  Zerg cannot use this tactic, as their defensive structures require Creep; Terrans can, but 100-mineral Bunkers are useless without another 200 minerals' worth of Marines, whereas with only 250 minerals (100 for the Pylon and 150 for the cannon) the Protoss are ready to go. Finally, do not attempt this tactic unless your teammates are willing to defend your base, which will be essentially unprotected.

Second Round / Post-Opening Strategies

 * Dragoon charge &mdash; Similar to the Zealot rush, but requiring more time, a group of 4-12 Dragoons can wreak havoc in the early-middle stages of a game. In addition to the Zealot strategies, the long (upgraded) range of Dragoons often enables them to hit key targets with impunity, especially if the enemy is overly reliant on static defense. This is particularly useful versus Terran, if the opponent's Refinery can be taken out before Siege Tank production starts. Counters to this include the wall-in, strategic Bunker placement, Stimpacks, and U-238 Shells.


 * Mass zealots &mdash; A surprisingly effective maneuver that maximizes the ease and simple power of persisting with a lower-tech approach, this strategy focuses on simply accumulating a large number of gateways and pumping out more and more zealots - although crucial mid-tech advantages to be sought with this strategy are the zealot speed upgrade, available from the Citadel of Adun, and Forge upgrades, particularly for ground unit attack. Some complementary dragoons may be mixed into the zealot hordes, or better yet, this strategy is coordinated with a teammate who focuses on complementary units, such as dragoons, marines, mutalisks, reavers, or even high templars; corsairs are a particularly effective complement. But even if the zealots must bear the brunt of air-to-ground attacks with no anti-air, their sheer numbers make it difficult for an enemy to cut their numbers quickly (unless a splash or area attach is used), and the mass zealots can often inflict serious damage before they can all be taken down; and the robust simplicity of this approach means that by this point, you have probably had plenty of time to produce another wave of zealots, and potential complementary units. This approach is not without its limits, however; a vast field of sunken colonies infested with low-tech zerg units is likely to be able to repel mass zealot attacks indefinitely.

Mid-Game Strategies

 * Reaver Drop &mdash; This requires a substantial investment in tech, up to the Robotics Facility and Robotics Support Bay, which can't realistically be done without dividing one's focus on more standard base defense; but once prepared, if the enemy has not developed comprehensive defenses, can still wreak havoc, even with a small-scale expedition. At least one shuttle and typically at least two reavers are produced; as soon as the reavers are ready, scarab production is begun, the reavers are set on a control group and loaded into the shuttle(s). A safe route has preferably been scouted out, along which the shuttles are flown, away from the attention of any enemy forces, around to the back of an enemy base; the reavers are then dropped on the enemy base, typically beginning near the production pile, behind the minerals or even between the minerals and base, directly among the resource gatherers. Additional scarab production is begun as soon as the reavers are out. The reavers fire their scarabs at the resource gatherers, which are typically tightly congregated and particularly vulnerable to the scarabs' splash damage. A dramatic number of the resource gatherers can be wiped out in a surprisingly short time in this manner, crippling the enemy's economy. The inexperienced often have their defensive forces heavily concentrated in a forward position in anticipation of a land attack, although this becomes less typical as the game advances. The enemy then tries to summon the defending combat units back from the forward position to the production pile area. Even then, however, it is often surprisingly effective to load the reavers back onto their shuttles (giving the command to the reaver control group, rather than the shuttle, for a speedier upload), fly the shuttle to the opposite rear corner of the base, and unload them again; any ground units that have been gathered toward the reavers' original location have to traverse the typically very densely packed central base to approach the reavers again. Because of the reaver's significant investment, it is also often worthwhile to pack up the reavers and fly them off in retreat if they sustain significant damage, rather than let them fight to the death, then use them again a moment later when their shields have restored (and hopefully, scarab upgrades and ground armor/shield upgrades have been completed).
 * A reaver drop can be effectively defended against by providing defensive capabilities surrounding all sides of a base, and maintained in close proximity to the production pile itself, so an airborne attack force will not be clear of the defenses upon penetrating to the core of the base. Photon cannons or sunken colonies placed in immediate proximity to the mineral pile is often an effective defense.
 * A reaver drop can be paired with complementary units, at the expense of additional time and production prior to deploying the reaver drop expedition. Zealots, dragoons, and dark templars are all useful in helping defend the reaver while it provides the brunt of offense, particularly by keeping them close to the reavers. Keeping the reavers well-positioned is also very important; they can be fairly idiotic if left to move around on their own; often it works well to keep them stopped in a particular spot and just let the scarabs fly. An observer is often an indispensible companion for the reavers. High templars can be very effective when dropped together with reavers, although this operation requires an intense level of rapid micromanagement. Corsairs are a favorite pairing with a reaverdrop; not only can they help keep the skies clear above the reavers, and defend the shuttles in flight, but their disruption webs and the reavers' scarabs are a perfect complement for a devastating attack. This is particularly true when facing siege tanks, one of the reaver's deadliest foes, but which suffers horribly under the influence of both a disruption web and an angry reaver.
 * The reaver drop was popularized in tournament games in 1998 by the player known on Battle.net as Zileas, then an underclassman at MIT, whose quickness with coordinating the reavers and shuttles were described as "like a shuttle that fires scarabs".

Defense Strategies

 * Photon Cannon Placement &mdash; A common error of amateurs is to rely too heavily on photon cannons; to place too many of them close together in "cannon farms"; and to concentrate them in bottlenecks of anticipated attacks. The opponent's solution to any or all of these tendencies is likely to involve the investment needed to launch either an airborne attack that bypasses the cannon farms, or develop an antidote to the cannons, such as guardians, who are probably the cannons' worst enemy. Either way, your heavy investment in stationary artillery is neutralized, and the enemy's superior investment in mobile units is likely to pay off. Instead, cannons should be scattered in front passageways and bottlenecks in small numbers, and scattered judiciously around one's production pile, perimeters, and other assets, leaving the bulk of resources available for units they can complement. A good guide is to keep cannons just far apart and scattered widely enough that their range of cloak detection covers the broadest possible area.


 * High Templars On the Home Front &mdash; Keeping several high templars close in around one's base often proves an invaluable component of homeland defense, particularly in combination with photon cannons and dragoons, for example. Having high templars that can get just within range of a bottleneck the enemy is trying to pass through, in a tightly packed crowd, can have brutal effects on the would-be attackers. Keeping a few high templars wandering around the core and back areas of the base can provide an immediate and effective counterattack against an aerial invasion. If an invasion is still going strong when the high templars run out of energy, it is often worthwhile to merge them into archons as soon as they can't produce any more storm. Waiting for them to power back up again while an enemy is actively advancing is typically just a recipe for letting the templars die uselessly; the archon meld, while it also takes some time, has a really high shield strength, and is likely to be able to finish into a substantial new combatant in time to contribute effectively. As a bonus, the archons look and sound the coolest of any unit in the game.


 * Defensive Reavers &mdash; A few reavers buried deep behind the zealots, goons and cannons forming the front and secondary lines of your defenses, plopping scarabs way out in front to shower splash damage on tightly bunched invaders, can be very difficult for the enemy to come up with any effective counter for.


 * Defensive Carriers &mdash; Carriers are an exciting late-game unit for attack, though they are typically not the most effective option. For defense, however, they can be parked right above a shield battery or two; while the shield batteries are typically not very useful, and always require micromanagement, their use is maximized the larger the investment and power is concentrated in a single unit. Shield batteries and carriers that can be parked above them, thereby filling a defensive role, are more useful together than either one could be in any other context. With the interceptors complementing other units and cannon fire against an invasion force, and a carrier not only tucked unmoving behind and above the bulk of the defense and with repeatedly recharging shields to boot, the defensive carriers can turn into an almost invincible protector of the base.