Protoss

The Protoss are the first "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 light-less 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 each 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.

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.

History
Under Construction

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, 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.
 * Twilight Archon: Two Templar merged into one, capable of wielding powerful psionic shockwaves to obliterate those who would oppose them. (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 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.

Spacecraft

 * Scout: Under Construction
 * Corsair: Under Construction
 * 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, which can strafe light ground units. Quickly replacing both the Scouts and Corsairs on the battlefield after the fall of Aiur, they are able to unleash a short-lived storm of decimation when the pilot overloads its warp field through the ship's ion blasters. (Starcraft 2 only)
 * Warp Ray: A melding of Protoss and Dark Templar technologies, the Warp 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 Warp 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.