The Conclave were a group of elders, chosen for their wisdom and their knowledge and orthodoxy in relation to the Khala. The Ara Tribe controlled who presided within the Conclave, as it maintained the power within the Judicator caste. In addition the Ara commanded the khalen'ri Praetor Guard, the personal guard and enforcement arm of the Conclave.
While the Conclave existed, it never allowed females into the organization.
At least one preserver was always on hand at the Conclave during its existence. They knew many secrets also known to the preservers, who could offer advice but could do little more than observe.
The Conclave directed that all texts and artifacts from the Aeon of Strife be sealed away on the xel'naga archive world of Zhakul upon taking power. The information was entrusted to a trio of preservers.
The Conclave kept secret the existence of a group of rogue protoss that refused to submit to the Khala, convinced that their aberrant influence might spread throughout protoss society and destroy all that Khas had accomplished. They ordered Adun to eradicate them. When Aiur was rocked by a series of violent psionic storms, the Conclave was shocked that the Templar had not destroyed the rogues, but knew that it would be forced to publicly admit their existence if it punished Adun for insubordination. The Conclave decided to banish the rogues from Aiur. This act earned them the hatred of the Dark Templar.
The purifiers were built under direct order of the Conclave to be an ultimate fighting force at a time when protoss scientists were making technological advancements in intelligent robotics and artificial intelligence. The program was originally kept in shadow and unified by the belief that consciousness could be turned into data, thereby used to preserve the thought-process and decision-making ability of a formerly living being. Studies proved that the replications were often 99.3% accurate to the protoss subject the replication was patterned after. The Conclave moved to use this technology to build a force replicated from the greatest warriors in history.
They did not, however, treat the purifiers with the same respect afforded to regular Templar. Instead, the purifiers were little more than slaves in the Conclave's eyes. Eventually, the purifiers chose to rebel, killing their masters. In return, the Conclave determined that the purifiers were too dangerous and banned them. They were powered down and launched away in a command vessel, Cybros, to be reactivated only in the direst of circumstances.
When ExecutorTassadar brought a number of zergprobes to Aiur in 2499, the Conclave referred to the terrans as "worthless" and argued that if they had already been infested, they were to be purified. Upon hearing that Chau Sara had been infested, the Conclave immediately ordered Tassadar to burn it.
After the zerg invasion of Aiur in 2500, the Conclave dictated that the first priority was to strengthen their defenses.
The Conclave became convinced that its stratagems were winning the war against the zerg after the destruction of the hive cluster near Scion. Turning their attention to personal matters, they ordered JudicatorAldaris to find and arrest Tassadar and bring him to Aiur to stand trial for treason.
The Conclave branded Tassadar a traitor upon Aldaris' return to Aiur. The Heart of the Conclave was destroyed by Tassadar's followers, but Tassadar was taken into custody. However, the Conclave was unable to prevent Fenix and Jim Raynor from securing his release due to the intervention of Dark PrelateZeratul. The Conclave lost many members to the civil war.
↑Tassadar: "Executor! Aldaris! This madness must stop! The sight of my brethren slaughtering one another is more than I can stand. Though I fear you would doom us all, Aldaris, I surrender myself to the Conclave. En Taro Adun, Executor. Don't give up the fight!" Aldaris: "Tassadar of the Templar, by your actions you have severed yourself from the mercy of your brethren. You refused to destroy the Terran worlds as was commanded. You have questioned time and time again, the sacred will of the Conclave. And you have abandoned your Homeworld in its darkest hour. Most grievous of all is that you have allied yourself with the blasphemous Dark Ones, and learned to utilize their profane powers in tandem with our own! What say you, oh fallen Templar?" Tassadar: "Aldaris, I submit myself to the Conclave's judgment. But know this, given the same choices again, I would surely have made them. I have sacrificed all that our world might live. I have sullied my honor, I have discarded my rank and standing, and I have even broken our own most ancient traditions. But never think that I would, for one moment, regret my actions. For I am Templar, and above all else, I have sworn to Protect our Homeworld 'till the end." StarCraft. Vivendi Games. Level/area: Homeland (in English). 1998.
↑Zeratul: "Stay thy hand, Judicator. The stewards of Tassadar shall not fall while the Dark Templar live. Call off your guards and stand aside, and you may yet live to see another moonrise." Aldaris: "I will not be addressed so by one so devoid of the Khala's light. You and your vile brethren shall die with these traitors." Zeratul: "Are you truly so blinded by your vaunted religion, that you can't see the fall ahead of you? Your Conclave believes that they are winning this war, but all they've succeeded in doing is helping the Overmind to win." Aldaris: "What could you possibly know about our designs, blasphemer?" Zeratul: "You speak of knowledge, Judicator? You speak of experience? I have journeyed through the darkness between the most distant stars. I have beheld the births of negative-suns and borne witness to the entropy of entire realities... Unto my experience, Aldaris, all that you've built here on Aiur is but a fleeting dream. A dream from which your precious Conclave shall awaken, finding themselves drowned in a greater nightmare." StarCraft. Vivendi Games. Level/area: The Trial of Tassadar (in English). 1998.
↑Aldaris: "Executor. Tassadar. This comes too late to you. But the Conclave has witnessed your defeat of the Cerebrate. They know now that they cannot deny the necessity or the valiancy of your actions. We sought to punish you, while it was we who were in error. You represent what is greatest in us all, and all our hopes go with you. EN TARO ADUN, brave Sons of Aiur!" StarCraft. Vivendi Games. Level/area: Eye of the Storm (in English). 1998.
↑Underwood, Peter, Chris Metzen and Bill Roper. StarCraft: Brood War (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.