The Templar Caste was comprised of the protoss holy warriors who followed the Khala's disciplines to achieve ever-escalating pinnacles of psionic power. Their ranks comprised some of the most powerful individuals in the Koprulu sector.
Templar were trained from youth to harness fear and to give their lives if necessary. Members of the Templar Caste who were particularly skilled psychics were known as high templar. Both high templar and any member of the Templar Caste were sometimes simply referred to as "Templar".
Before the advent of the Khala, each tribe had a definite proclivity or strength. The dictates of the Khala advised a three caste system, which each tribe fit easily into. The Templar tribes were those who had great physical prowess or agility, or tended towards strategy. In the early days of the Khala, they fought to protect the new protoss culture from those who disagreed with it. When the battles ended, the Templar defended their people from fearsome fauna and later from hostile alien beings while settling their colonies. The Templar Caste were called to battle their own during the Discord, as rogue tribes rejected the Khala. Even in times of peace, rare as they were, Templar would train constantly. Before the Fall of Aiur, members of the Templar Caste would often make pilgrimages to various sacred sites on the planet.
The Templar were engaged during the zerg invasion of Aiur. Uninspiring leadership by the Conclave hampered their efforts. Further difficulties arose with the return of Tassadar and the short lived civil war which further divided the Templar's resources. Ultimately the battle was lost and the Khalai were forced to abandon Aiur for Shakuras.
In 2506, the Templar Caste took part in the Reclamation of Aiur. The zealot Kaldalis and cadre of Templar serving as the akhundelar of the invasion established a pylon, allowing ground forces to warp to the surface. Templar warriors, alongside their Khalai Caste and Nerazim allies, pushed through the ranks of the zerg that held Aiur, but encountered hybrid as they attempted to clear the warp conduits on the planet.Amon then corrupted the Khala, chaining all Templar warriors who were bound to it to his will. Zeratul gave his life to free HierarchArtanis, who then set about to free what other Khalai protoss he could. Artanis and the liberated Templar escaped the planet onboard the arkshipSpear of Adun. The corrupted Templar then set out with the Golden Aramda under ExecutorSelendis to carry out Amon's will and purify the universe of life.
Onboard the ship, the ancient Templar warriors and dragoons onboard were brought out of cryosleep after thousands of years, and had their nerve cords cut to prevent Amon's corruption. Templar warriors served alongside Artanis during the evacuation and destruction of Shakuras, the defense of Korhal, and the reclamation of new Purifier technology from Glacius. They also helped unseal Ulnar, and after Artanis was trapped by Amon, they aided in his rescue.
The following section contains timeline information which isn't necessarily in chronological order.
Artanis's freed Templar took part in the operation to free the ancient Purifiers locked in stasis near Endion, and in the push to instate Alarak as Highlord of the Tal'darim, ending their alliance with Amon. Both of these operations were successful, and the Purifiers and Tal'darim stood united with the Daelaam. Meanwhile, the corrupted Templar began engaging with the Terran Dominion, and began to break through their weakened fleets.
When MatriarchVorazun'sdark templar tracked Amon's hybrid breeding operations and the headquarters of Moebius Corps to an asteroid field named Revanscar, Artanis sent forces to investiagte. However, Moebius Corps battlecruisers trapped the Spear of Adun, forcing Artanis's best Templar to stay behind to defend the arkship while a Khalai Caste member, PhasesmithKarax coordinated an assault on the facility. Karax's attack was successful in destroying the base and crippling Amon's army, and the boarders on the Spear of Adun were repelled. The act of Karax proved to Artanis that the age of the caste system was over, and that through deeds all should be able to become Templar. Thus, the Templar Caste was abolished that day, though protoss warriors would continue to be referred to as Templar.
↑Raszagal: "Congratulations, Executor. Your success has brought us the promise of hope against the Zerg. However, we face a new threat within our own ranks. In your absence, JudicatorAldaris and an entire legion of Khalai survivors from Aiur have begun an open revolt against us." Zeratul: "By the gods, this is ill news indeed! Why would Aldaris betray us so?" Raszagal: "He and his ilk believe that it was wrong to have abandoned Aiur and consorted with our people. Their prejudices have driven them to perpetuate the Conclave's sins against us! Even now, Aldaris and his loyalist templar forces are preparing to attack our Citadel." Artanis: "I can scarcely believe this. As if the Zerg were not enough! Matriarch, are you certain of this?" Raszagal: "All too certain, young templar. Executor, as Matriarch of the Dark Templar and custodian of this world, I hereby order you to terminate Judicator Aldaris, and quell this untimely uprising without delay! There will be no dissent among us while the Zerg are poised to strike!" StarCraft: Brood War. Vivendi Games. Level/area: The Insurgent (in English). 1998.