From Halopedia, the Halo wiki

Thremaleon were an endangered species of running lizards native to Sanghelios. The barbed skinned reptiles were known for being quite vicious and were hunted by ancient Sangheili, who used their spiked leather for braces and boots. Wearing thremaleon skin was considered a sign of affectation, typically to show off one's membership in a Victory or Death cult. [1]

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