I bought the skerren corvus mask from Tess Everest during the holloween event and it doesnt have a masterwork slot but i saw other people with their helmets masterworked, bungie please fix, i have ocd and this is bugging me that all my armour besides my helmet is masterworked.
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Anything you bought, rather than obtained through a Festival engram won't have a masterwork slot. They're aware, and are presumably working on a fix.