High Prophet of Truth

The High Prophet of Truth, born Ord Casto, was one of three Covenant Hierarchs of the Ninth Age of Reclamation, and by far the most influential. Formerly the leader of the Ministry of Tranquility, he was widely regarded for his role in bringing about the Great Schism.

Biography
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 * Implemented a lot of early reforms when Regret was away from High Charity; specifically, when Regret was touring the battlefields of the Human-Covenant War
 * Played a part in removing Xytan from the war: Mercy advised Truth that he could challenge the high council. Used the slower rate of his conquest to dismiss him and place the Combined Fleet of Virtuous Ascendancy under command of someone else.
 * In the latter half of the war, Truth had a lot of new manufacturing infrastructure built in the crossing regions between the Covenant and human spheres as well as beyond Jiralhanae space, staffed almost exclusively by Brutes. While the Sangheili councilors knew of the operation, they weren't aware of the sheer extent of it. This infrastructure represents the high end of Covenant industry outside High Charity, though much of it is also focused toward manufacturing gear for the Brutes; but those newly-formed industrial worlds will serve as some of the main battlegrounds of the Great Schism as it washes across the Covenant in the post-war era, and gaining control of them will be a key strategic goal for the Concord.
 * The position of the San'Shyuum in Truth's plan was also complicated, as not all Prophets involved with the plan were even aware of its full extent. Even as they were given new postings as advisors to Brute fleetmasters and chieftains they could only guess at the ulterior reasons. Only when the Schism began to unfold they were sent secret missives from Truth himself, informing them of what was about to take place and what their own role in it would be. Some San'Shyuum chose not to follow these orders despite Truth threatening them with immediate excommunication for siding with the Elites.
 * Often recruited not-quite-believers who quietly questioned the divinity of the Forerunners or the veracity of the Great Journey... but who enthusiastically supported the mission of the Covenant because they thought it was a vehicle for uplifting and enlightening the galaxy.
 * Truth couldn't rely on fanatics, because he couldn't control them when they were operating in the theater. If a fanatic realized what Humanity was, he could easily turn on the Hierarchs.
 * May have had a secret police unit to enforce his orders. Possibly trained by Prelates.
 * Had carefully-laid plans for replacing the Sangheili, but had to accelerate them due to Regret attacking Earth.
 * Seemed to prop up Cethegus as the next Chieftain of the Jiralhanae? Hard to say.