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You are, all of you, vermin! Cowering in the dirt, thinking... what, I wonder? That you might escape the coming fire? No! Your world will burn until its surface is but glass! And not even your Demon will live to creep - blackened - from its hole to mar the reflection of our passage, the culmination of our Journey. For your destruction is the will of the gods! And I? I am their instrument!
~ The High Prophet of Truth
~ The High Prophet of Truth's last words before Thel kills him.

The High Prophet of Truth is one of the three Prophet Hierarchs that led the Covenant Empire (the others being the Prophet of Mercy and the Prophet of Regret), and one of the main antagonists of the Halo video game series, being one of the main instigators of the war against Humanity.

After learning from a Forerunner AI that humanity were the ones meant to inherit the Forerunners' legacy, Truth and the other prophets decided to eradicate humanity to prevent the secret from coming out and sparking a revolt against them.

His ultimate goal is to activate the Halo Rings and use them to remake the galaxy to his liking, as he sees himself as a god. He is one of the main antagonists of the Halo series, serving as the main antagonist of Halo 2 and one of the two main antagonists of Halo 3 alongside the Gravemind.

In Halo 2, he was voiced by Michael Wincott, who also played Top Dollar in The Crow, Philo Gant in Strange Days, Michael Korda in Metro, and Scroop in Disney's Treasure Planet. In Halo 3, he was voiced by Terence Stamp, who also played Ramsley in Disney's The Haunted Mansion, and General Zod in the Superman series.



Ord Casto originally served as a junior staffer in the Ministry of Concert. While working there, Ord uncovered a plot by several Kig-Yar Shipmasters to poison Infusions, recreational narcotics often enjoyed by Unggoy, to render the Unggoy infertile as retaliation for the Kig-Yar nests that had been displaced by a recent boom in the Unggoy population. Casto reported the incident to his superior, the Minister of Concert who issued a fine to the Kig-Yar involved in the scheme. Feeling the punishment was too lenient, Casto attempted to submit a formal complaint, but was blocked. The Infusion Incident soon brought about the Unggoy Rebellion, leading into the 39th Age of Conflict. After the rebellion was put down and the Unggoy were brought back into the Covenant, Casto was promoted to Minister of Fortitude.

Fortitude was later notified by the Vice Minister of Tranquility that a Luminary had discovered a massive trove of Forerunner relics on planet Harvest. Intending to use the artifacts to advance to a high position within the Covenant, Tranquility offered the same for Fortitude, who accepted. Rather then use Sangheili to retrieve the artifacts, the two chose to use the Jiralhanae instead so they wouldn't upset the fine balance of power by leting the Sangheili obtain them. Fortitude and Tranquility also began a plan to become the next Prophet Hierarchs of the Covenant by exposing the Prophet of Restraint, one of the current Hierarchs. Before doing so, the two visited the Forerunner dreadnought and met with the old Philologist on board it to receive advice from the ship's "Oracle", which had long been inactive. The two decided to input the Luminary's data on Harvest to see what would happen. Much to their surprise, the Oracle, in actuality a fragment of the Forerunner Contender-class A.I. 032 Mendicant Bias, suddenly reactivated and revealed that they'd misinterpreting their findings. The AI revealed that the humans were actually the true inheritors of the mantle of the Forerunners and that the Forerunners had in fact not ascended when they activated the Halo rings. Mendicant then attempted to use the Dreadnought to take the humans to the Ark, but was short-circuited by Lekgolo worms exploring the vessel's pathways.

As the truth spoken of by the Oracle revealed the Covenant religion to be false and would surely tear the Covenant apart if it got out, the three San'Shyuum who had bore witness to the revelation swore to secrecy. Fortitude and Tranquility decided to bring the Philologist into their plan to become Hierarchs and go forward with their plans to oust the current ones. Having discovered that the Prophet of Restraint had secretly fathered two children when he offered Tranquility a high position if he adopted the children, the Fortitude and Tranquility used the information to blackmail Restraint and make him and the other two Prophet Hierarchs step down or they would reveal his affair. The Minister of Fortitude, Vice Minister of Tranquility and the Philogist then took their place as Prophet Hierarchs ascended to become the new rulers of the Covenant. Fortitude chose "Truth" as his Prophet name as a reminder of the lies he would tell to keep the Covenant in order.

To prevent the truth about the humans being the true Reclaimers from being discovered, the three Hierarchs declared war on humanity with the intention of wiping them out and staying in power.

Halo 2

The Prophet of Truth first appeared during Supreme Commander Thel Vadamee's trial, where he was already seen as more dominant than the other Hierarchs and later made Thel the new Arbiter of the Covenant, making his first assignment to assassinate Sesa Refumee and his Heretic followers. After the recent murder of the High Prophet of Regret, Truth organized the Changing of the Guard where Elites would give up their positions as Honor Guards to the Brutes, one of the stages that Truth planned to overthrow the Elites with Brutes as the latter were more loyal and easier to use as pawns. 

After the capture of 343 Guilty Spark, he sent Thel Vadamee to retrieve the Index (Sacred Icon) from the Flood and Forerunner Sentinels that are guarding it. Truth soon had the Index in his hands and when John 117 infiltrated High Charity, Truth escaped alongside Mercy and ordered his Brutes to kill him. John's main objective was to find Truth and get the Index from him, but Truth made his way to the Phantoms with Mercy and Tartarus. He gave the Index to Tartarus and wanted him to begin the Great Journey, then Truth left High Charity to lead Covenant forces in invading Earth.

Halo 3

On Earth, Truth led a fleet and first appeared in Crow's Nest where he gave a hint to the UNSC forces there that they will die in the fire. Holograms of Truth was then spread throughout various missions that involved Covenant enemies, where Covenant forces preached to him and listened to his every word until an enemy attacks them. Truth then appears in person on The Covenant, where he has Sergeant Johnson captured and used him to fire the Halo Array, he also murdered Miranda Keyes with a Brute Spiker. Both John 117 and Thel then confronted Truth and stopped him from activating the rings. Thel then got his revenge by impaling the Prophet, ending Truth once and for all.

Halo 3: ODST

Prophet of Truth assembled a Brute fleet to attack the New Mombasa which ODSTs were deployed in and were ordered to kill all the remaining Elite commanders as well as Human survivors. If you get the Legendary Ending, Truth will appear in person with two Engineers beside him and oversee Phantoms going to Earth.


Halo's destruction was your error and you rightly bear the blame. But the Council was... overzealous. We know you are no heretic. This is the true face of heresy, one who would subvert our faith and incite rebellion against the High Council.
~ Truth in the mission The Arbiter.
The release of the parasite was unexpected, unfortunate. But, there is no need to panic. In truth, this is a time to rejoice. A moment that all the Covenant should savior. For the Sacred Icon has been found. With it, our path is clear, our entry into the Divine Beyond guaranteed! The Great Journey is nigh...and nothing, not even the Flood, can stop it.
~ Truth in the mission Gravemind.
Shall we let the Flood consume our holy city? Turn High Charity into another of their wretched hives? No enemy has ever withstood our might. The Flood, too, shall fail
~ Truth in the mission High Charity.
I opened the portal to this hallowed place, this shelter from Halo's fire, in the hopes that more of our Covenant would join us. Alas, save for a rabble of Heretics and their Demon allies (Humans), we are all that remains on this new world. So we must temper joy and sorrow in our hearts, for those who were left behind
~ Truth in The Ark.
Your forefathers wisely set aside their compassion...steeled themselves for what needed to be done. I see now why they left you behind. You were weak... and gods must be strong!
~ Truth in The Covenant.



            Halo Villains

The Flood | Huragok | Mgalekgolo | Jiralhanae | Kig-Yar | Sangheili | San Shyuum | Unggoy

Covenant Empire
Covenant High Council: Prophet of Truth | Prophet of Mercy | Prophet of Regret
Covenant Sangheili: Ardo 'Moretumee | Bako 'Ikaporamee | Field Marshal | Lat 'Ravamee | Luro 'Taralumee | Merg Vol | Ontomee | Re'gish Wamik | Rho 'Barutamee | Ripa 'Moramee | Rtas Vadum | Thel 'Vadam
Covenant Jiralhanae: Lepidus | Parabum | Tartarus

Storm Covenant
The Didact | Jul 'Mdama | Gek 'Lhar | Parg Vol | Kitun 'Arach

Cortana | Warden Eternal | Guardians | Prometheans

The Banished
Atriox | Decimus | Let 'Volir

Office of Naval Intelligence
Jameson Locke | James Ackerson

Jerald Mulkey Ander | Robert Watts

343 Guilty Spark | Commissioner Kinsler | Gravemind | Heretics (Sesa Refumee)

Halo: Legends
Harka | Pluton

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