Hunters have Cloaks, Titans have Marks, and Warlocks have Bonds. If there were a fourth class what would it have? I suppose it might depend on how you envision a fourth class thematically. Or maybe you just want to say something funny like putting a little flag on the top of their head. Either way try to come up with something that is visually distinct from the other classes.
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a choker
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A glowing, colour cycling orb hanging from a chain around the neck, or on a short chain hanging from the waist.