Guardians are dead, right? I mean, they don't technically have functioning organs, right? Like... the only feasible reason for a dead thing to have oxygen in their helmet is so they can speak on radios inside the helmet... and Ghost does most of the talking anyway.
https://www.bungie.net/en/Armory/Detail?type=item&item=231278444&itemname=Wolf%20Pelt%20Weave%201.0
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I'm a robot.