Great Truth

The Great Truth movement was a splinter group of the Empire of the Covenant, first formed in late 2552 by warriors of the Special Warfare Group of the Fleet of Particular Justice, and led initially by Special Operations Commander. While initially small in size, scope, and influence, the Great Truth movement would ultimately come to encompass virtually all, as well as significant numbers of , , , and , setting the basis for the re-establishment of the United Republics of Sanghelios and its associated protectorates.

The movement traced its origins to Sense and Bearing, a Special Operations detachment of Sangheili and Unggoy warriors dispatched by the Fleet of Particular Justice to reconnoiter a  located nearby the gas giant. Although orders were simply to provide armed reconnaissance and a catalogue of Forerunner artifacts, the warriors found there instead the Monitor-class construct, who, without a charge in the wake of Installation-04's destruction, had traveled to the Threshold facility; the intelligence related to Commander 'Refumee and the operators under his command the true purpose of the Halo installations and the lies surrounding the Imperial Faith, prompting Sense and Bearing to renounce the Empire entirely, founding the Movement of Great Truth to lead the races of the Covenant out of the darkness of manipulation. Independent from the Empire and expecting retaliation from the Imperial Military, warriors of the newly formed movement swiftly began fortifying positions and broadcasting "Heretical" messages across Covenant military channels, hoping to incite revolt among the ranks of the Fleet.

Although the Separatists, deemed Heretics by the Hierarchy, would ultimately be defeated by their brother-warriors of the Fleet of Particular Justice's Special Warfare Group, the seed of doubt planted, in addition to events set in motion, would in time lead to the Great Schism, tearing the Empire asunder and leading many of the Covenant's former subjects toward the path of freedom from oppression and manipulation. Many of Sense and Bearing's warriors, dead or surviving, would be given apologies and military merits by Sangheili leadership, held in high esteem as those who spearheaded the search for truth, while Special Operations Commander 'Refumee, killed in the fighting above Threshold, would be granted high honour and have his line secured in the aristocracy by Arbiter Thel 'Vadam.

The Movement of Great Truth was formally disbanded immediately following the end of the Human-Covenant War, leaving in its place a re-formed United Republics of Sanghelios and its Unggoy, Kig-Yar, and Lekgolo protectorates.