Asceticism

Asceticism is a form and variation of Forerunner worship among the Covenant way of creed, involving a variety of practices, including humbling oneself before Forerunner technologies. Asceticism is followed in different forms by both the Sangheili and many San 'Shyuum in diversities of Covenant Ages and by notable individuals.

Ascetic priests
One of the former-Minister of Fortitude's clerics was a follower of the San 'Shyuum ascetic teachings. Ascetic priests led by the Philologist Hod Rumnt, who would later be known as the Prophet of Mercy, resided in the Forerunner Dreadnought, exploring its interior pathways with the help of trained Lekgolo worms. The Philologist also tended to the Oracle in the Dreadnought, and Covenant politicians would need to get the Oracle's blessing for formality's sake when deciding important matters. The priests weren't beyond political bribing or blackmail, however - for example, the Minister of Fortitude was prepared to make a donation of some sort for the Philologist when asking for a blessing for what they though to be a newly-discovered reliquary.

Sangheili Ascetics
The Ascetics are an ancient group of Sangheili whose main function is to defend and enforce ideological purity. During the Covenant's existence, the Ascetic guard was incorporated under the authority of the Ministry of Abnegation. The Sangheili Ascetics used their type of combat armor, known as the Ascetic Harness.

Trivia

 * In the real world, Asceticism is a form of strict self-denial intended to foster spiritual discipline.

List of appearances

 * Halo 3
 * Halo: Contact Harvest