Protoss

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The Protoss are the first "creation" of the Xel'Naga(also calling themselves "The First Born" considering the Zerg was the second creation of the Xel'Naga), which unintentionally led to the creation of the Zerg. They meant to give the Protoss "Purity of Form".

Physiology
The Protoss are approximately 3 meters tall, and are bipedal, standing upon two, two-digit digitigrade legs while manipulating objects with two, four digit hands -- two of which are opposable. Their chests and shoulders are broad, while their waists narrow significantly; the midsections are slim. The hands are in fact clawed, and can be used as deadly weapons should the Protoss be cornered unarmed.

Their skin is a scaled, semi-permeable surface, through which they will absorb what little water they require to survive. It is capable of changing colors, likely through chromatophores, which occurs to display their emotions visually. However, the skin is capable of both hearing and smelling; their olfactoring is sharp enough to properly identify other Protoss. That being said, their primary sense appears to be sight. Their eyes are two glowing spheres embedded in their heads, and are capable of seeing very well, even at night.

The head ends in a bony crest, extending from the crown. Beneath this emerges the nerve cords, which grant them access to their racial psionic gestalt -- it is this gestalt that is the basis to the Khala. Mentally, the Protoss sleep and dream in manners similar to Humans.

They are totally bereft of mouths, noses, and ears, as they need none of these to survive. While the reasoning for their lack of noses and ears are explained above, they lack mouths because of the photosynthetic abilities of their skin, making the Protoss autotrophs. They are advanced enough to be able to survive off of moonlight as opposed to sunlight, and can go for extended periods of time without being under the sun. However, the Dark Templar were seen to survive on the formerly lightless world of Shakuras; how they accomplished this is unknown, but may be related to some biological modifications they made to themselves. Another viable possibility is that they are actually capable of using any form of cosmic radiation as 'sustenance'.

Since they do not need to eat like many other creatures would have to, they would not eat the creatures they hunted, instead only hunting them to collect their blood and the hides, used for a variety of purposes in their culture. They no longer seem to hunt, however, likely creating synthetic properties to use in the stead of any blood or hides originally required.

They are an incredibly adaptable and resilient species, able to survive in harsh natural conditions and climates. This, coupled with their strength and speed which were considered unparalleled by the Xel'Naga, led to the latter seeing the former as having purity of form, leading them to manipulate the species as they saw fit.

While their bodies are sustained using blue or purple, slightly iridescent blood, they also possess a psionic pulse that is encased within their physical shell, which may serve the purpose of a soul. Once their body is destroyed and they subsequently perish, this psionic pulse will dissipate, resulting in a flare of pale blue light that vapourizes any remains. With training, they can phase quietly into the Khala.

The average life expectancy of a Protoss is at least a thousand years, as seen in Matriarch Raszagal. Protoss under 300 years of age will rarely hold any form of significant political position. Artanis, who is 262 years old, is considered young, despite his powerful military position.

Philosophy
Protoss religion came about thanks to the wars that plagued their kind upon Aiur following the abandonment from the Xel'Naga. Finally united under the teachings of Khas after many generations of all-out warfare, the Protoss people began to adhere to the teachings of Khas, which was deemed "Khala", or the "Path of Ascension". Khala stated that if a Protoss warrior were to die in battle, then they would reach "Khala's End". Below are two philosophies of the Protoss:
 * Khala ("Path of Ascension"): This personal philosophy emphasizes inner peace and communal brotherhood. It also reflects in the caste system of the Protoss, where all castes are considered different but equal and working towards the same goal.
 * Dae'Uhl ("Great Stewardship"): This official policy was developed to concern the encountering of other races. Dae'Uhl is a strict code that, above all, protects life on the whole, while simultaneously mandating an inarguable policy of non-interference with the races they watch over, similar too the Prime Directive.

Aeon of Strife
The Aeon of Strife began when the Xel'Naga "abandoned" the Protoss, because they had forgotten their psionic gestalt field, which was what had drawn them in the first place. Each tribe blamed every other tribe, and the Protoss disintegrated into warring, primitive savages. This lasted until a mystic, name Savassan, who gained the title "Khas" (He who Brings Order), found a stockpile of Khaydarin Crystals, left behind by the Xel'Naga. After studying the crystals, he and his assistant, Temlaa, entered their psionic gestalt, the Khala. He gathered the tribal leaders, and instructed them on how to enter the Khala.

Golden Age
After the Aeon of Strife, Savassan's name was forgotten. The Protoss technology level shot upwards. They began to expand, defeating all who stood against them. They created the Motherships, huge saucer-shaped vehicles, with enough space for an entire colony, and enough power to rip holes in the fabric of space-time. It was "a good time to be alive".

The Dark Templar
However, as with all good times, it had to end. The Conclave, the Protoss government caste found out about a small group of Protoss who did not embrace the Khala. They demanded their greatest hero, Adun, to murder all these dissidents. However, Adun refused, instead teaching the "Dark Templar" to become invisible. A small group of Dark Templar began experimenting with something - nobody knows what - and caused a devastating storm over Aiur. The conclave was furious with Adun for disobeying them, and decided to banish them, forbidding Adun to see them off. Again, Adun disobeyed. The Conclave, again furious, began attacking the refugees. Sacrificing himself, Adun was able to use both Light and Dark energy to protect them long enough to escape.

Coming of the Zerg
The Protoss began expanding again, pushing ever outwards, meeting and greeting several alien races, including Humanity. After several centuries, they discovered a few small organisms, which they captured for study. One of the tests they used was how they responded to Khaydarin crystals; the beings handled the energy just fine. They then read the minds of the probes, and were dismayed to find that they were the harbingers of a new terror, the Zerg.

The Zerg attacked a Human colony world, Chau Sara, and the Protoss had no choice but to destroy the planet through a process called Sterilization or Purification. A fleet of 50 protoss warships warped into range and burned the entire planet's surface from space. Blasting away the atmosphere, vaporizing the seas, and liquefying the entire crust down to the upper mantle, no living organism, zerg, human, or indigenous lifeform, survived the extermination. Several more terran worlds were cleansed with this process. However, the Protoss commander, Tassadar, found murdering humans abhorrent, and often committed to long planetary campaigns to give the humans time to escape, disobeying the Conclave like Adun before him.

Alongside this, a small group of Dark Templar, led by their Prelate Zeratul, found that Void Psionics could permanently kill Zerg Cerebrates. They landed on Char, a planet housing the main bulk of Zerg forces, and tested their theory on a Cerebrate named Zasz. It proved a successful venture, but with a terrible price. Zeratul's mind brushed the Overmind's, unintentionally telling him the location of Aiur. The Zerg quickly attacked it, bringing shame on Tassadar and the entire Templar Caste.

Invasion of Aiur
The Zerg stole some Khaydarin Crystals, and made themselves at home, slaying the hero Fenix in the Temple of Antioch. Sometime during this struggle, the Shrine used for integrating "dead" Templar into Dragoon walkers was destroyed or taken over by the Zerg. After many months fighting the Zerg, Tassadar and his ally, James "Jim" Raynor, Zeratul, and the fallen hero Fenix, attacked the Overmind. After whittling it down, Tassadar used both Khala and Void psionics to permanently kill the creature, leaving the remaining Zerg as rampaging idiots.

Flight to Shakuras
The majority of the Protoss jumped through a Warp Gate to Shakuras, the new home of the Dark Templar.

Unfortunately, a small brood of Zerg made it to Shakuras first, although the Protoss quickly dispatched them. However, Shakuras, like Aiur, soon became infested. The Protoss went on a quest to obtain two gems, the Uraj and the Khalis. They brought these crystals, one imbued with a massive amount of Kala energy, another comprised of Void energy. The Protoss commanders, Artanis, who was promoted to Executor at "only" 262 after Tassadar's death, and Zeratul, brought them to a Xel'Naga temple, where the energy was focused, intertwined, and channeled into a massive explosion that scoured the Zerg from Shakuras.

The Brood War
During the time that the Protoss were fighting to keep Shakuras from Zerg control, the infested remains of the once-human Sarah Kerrigan mind-controlled the Dark Templar Matriarch, Razsagal (Rash-uh-gall), and murdered the last surviving Judicator. Zeratul could not stand to see her as a Zerg slave and killed her. Near death, Raszagal dubbed Zeratul the Patriarch of the Dark Templar. After this, Zeratul left. During his travels, he found a secret research facility experimenting on combining Zerg and Protoss genetics. He was extremely appalled, and disappeared to brood over what this meant.

Aftermath
The Protoss have recovered somewhat, and are bringing home some of their Motherships, and retrieving the massive Colossus war-robots. They are also experimenting with combining Void and Khala psionics, resulting in the creation of the Warp Ray and Twilight Archon.

Units

 * Zealot: Templar warriors who have yet to reach the upper rankings of Khala. They serve as the Protoss' main infantry.
 * Dragoon: The discontinued branch of Zealots who had been crippled in battle, yet volunteered to be implanted in exosuits to continue the fight. Because Aiur was abandoned and the temple dedicated to the dragoon infested by the Zerg, they are now all but gone.
 * Immortal: Those Dragoons who survived the exile from Aiur have been transformed into the Immortals, and are now retrofitted with twin phase disruptors and hardened energy shields. Because Aiur was abandoned, and the Shrine necessary to facilitate integration into a robotic shell was destroyed or corrupted, no Immortals can be built, and as more and more die on the front lines, soon there will be none left to fight. (Starcraft 2 only)
 * Dark Templar: Templar warriors of Shakuras, armed with Warp Blades, who learned to use the psionic powers of the void to combat their foes.
 * Archon: Two Templar merged into one, capable of wielding powerful psionic shockwaves to obliterate those who would oppose them. Their quotes imply a state of paradise and purity.
 * Dark Archon: Two Dark Templar can merge their souls in the same way normal Templar can, but the result is very different. They are able to create maelstroms of psionic force as well as permanently taking over an enemy's mind. Their quotes imply that their existance is a living hell.
 * Twilight Archon:-The Twilight Archon is a fusion of both kinds of Protoss, light and dark. They are capable of projecting psionic shockwaves, but it is unknown if they can use any of the Dark Archon's abilities. (Starcraft 2 only)
 * Stalker: The Stalker is a Dark Templar version of the Dragoon. Instead of the cloaking ability of the normal Dark Templar, it can teleport short distances, either to flank or retreat. (Starcraft 2 only)

Robots

 * Probe: Small "construction" robot.
 * Reaver: A hulking, worm-like mobile factory which creates Scarab drones.
 * Observer: Small scout drones employed to record information on vast wastelands and battles for later study. Due to their complex sensor array, they have little room for weaponry, and therefore go without. However, they are capable of detecting cloaked or otherwise concealed opponents with ease, making them an invaluable asset to the Protoss war machine. While Observers built for deep space missions have no defenses whatsoever, those destined for battle are equipped with a micro-cloaking field that does not require large doses of energy to keep on for long periods of time due to its minuscule sensor signature.
 * Interceptor: Small robots built and serviced by Carriers. Aboard most of these capital ships, they serve as their only means of weaponry. They are capable of quickly bringing down hostile flight formations and can also fire potent plasma charges at ground-based targets.
 * Phase Prism: Used as a transport vessel, these robots convert both living and inorganic subjects into pure energy, with their unique signature imprinted temporarily within the prism's crystal lattice core. This process is obviously reversible. It can also be used to power Protoss structures around it, like a makeshift Pylon; however, this effect is only temporary, and the prism must revert to its transport mode within a matter of moments. (Starcraft 2 only)
 * Colossus: Striding across the battlefield on four tall, slender legs, the Colossus has a high level of mobility. Because of its massive size and the length of its legs, it is capable of stepping over and onto steep elevations such as cliffs with little difficulty, giving it a dominant field of fire. It carries two thermal lances, one mounted to each side of its chassis, which can create swathes of destruction as they burn through enemy troops. Unlike most Protoss robots, the Colossus was constructed purely as a war-machine. (Starcraft 2 only)

Spacecraft

 * Scout: Under Construction
 * Corsair: The Dark Templar needed an air-to-air defender during their travels, and built the Corsair fighter. The prongs on the front of the ship focus a large amount of neutrons onto an enemy, causing weak damage, but the high rate of fire makes up for that. The pilot can focus Void energy through the neutron projector, and disrupt the firing sequences of enemy surface to air weapons.
 * Carrier: The Protoss' main capital ships, the Carriers unleash fleets of robotic Interceptors to do battle with hostile flight formations while also strafing slower ground-based targets with plasma charges. Other than this, few Carriers possess on-board weaponry.
 * Super Carrier: Few and far between, these are the Protoss' ultimate capital ships. These are heavily armed, and are likely the vessels capable of "glassing" worlds to eradicate Zerg infestations. Because these are so few in numbers, they cannot be fielded into battle.
 * Phoenix: Air-to-air spacecraft armed with twin ion cannons. Quickly replacing both the Scouts and Corsairs on the battlefield after the fall of Aiur, they are able to create an anti-gravity field capable of lifting ground units into the air, rendering them vulnerable to other anti-air fire. (Starcraft 2 only)
 * Void Ray: A melding of Protoss and Dark Templar technologies, the Void Ray is built around a single gigantic power source: the prismatic core, which draws energy from both the psionic matrix of the Protoss of Aiur and the Void, which only the Dark Templar truly understand. When attacking, the arms "blossom" open like a flower, while the complex array of warp lenses and phase-crystals focus the core's energy into a ravening beam. As time elapses, the beam is held on its target, while three more focusing arrays work to focus two more beams, causing its devastating power to grow exponentially with the beam's intensity. It is said that the Void Ray will one day fully replace the Carriers as the top Protoss capital ship in service. (Starcraft 2 only)
 * Mothership: Constructed centuries ago, these vessels once used as primary command ships and then holy shrines now make their return as the primary command ships of the Protoss fleet, with the loss of Aiur. At their heart is a huge khaydarin crystal which has been infused with an incredible amount of psionic energy. By tapping into this energy, it can warp or even crack the very fabric of space and time itself. With this devastating power unleashed, it can wipe out entire squadrons of enemy ships in the blink of an eye, or even lay waste to entire planets. Female Templar, who up untill now have not been seen in the Protoss military, are being compensated by being the only ones authorized to command these mighty vessels.