I have the Legend Achievement, and no Helioskrill.
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343! Why don’t I have Helioskrill yet! I have the Legend Achievement, and no Helioskrill!
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As for your issue, try going into MCC, change a customization item (armor, emblem, banner, something like that), and make sure it saves your change. Might help to open up the Halo Channel app, too. Then go back to Halo 5 and see if Helioskrill is there.
i would hate that if that happen to me