Templar are trained from youth to harness fear and to give their lives if necessary. Members of the Templar Caste who are particularly skilled psychics are known as high templar. Both high templar and any member of the Templar Caste are sometimes simply referred to as "Templar".
The Templar Caste is led by an executor. At various times there have been multiple executors.
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. 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.
↑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.