Heretic Sangheili (Earth-5875)

Heretic sangheili were sangheili who stood by the side of Sesa 'Refumee and his heretic faction, the Light of Truth, rejecting the Path and rebelling against the Covenant and its Hierarchs.

Overview
Originally members of an artifact retrieval group of the Fleet of Particular Justice led by Sesa 'Refumee and Loka 'Bandolee, these sangheili were deployed to the Threshold Mine orbiting the gas giant Threshold during the Battle of Installation 04. After the end of the battle and the Covenant defeat during it, the team was abandoned by the fleet and were left stranding on the mine, where they were discovered by 343 Guilty Spark, who, after an extensive conversation with 'Refumee, revealed the true nature of the Halo Array, proving the belief on the Great Journey and the worship of forerunners as gods to be false. This led 'Refumee to band all sangheili, unggoy, and huragok under his command and form the Light of Truth.

Description
Heretic sangheili wore breathing apparatuses instead of helmets donned by the warriors of the Covenant, in order to enable their survival in hazardous environments, such as the Threshold Mine. Their armor possesses four fins at their backs, a design of Malurokian origin.