I have done all my subclass quest for the taken except my void walker class for the walker, I can't pick up the emblems for them.
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This is kinda late but the quest you must complete is the single subclass one on each character the quest will have you go and get 15 knife kills with the first subclass.Ex. Hunter will be using throwing knife. Then you go to grenades then to multikills with the super(requires two at least) the start over with the second class E.x Goldengun, Bladedancer and after the second subclass is complete the new ones. You will get the emblems after the super multikills from the vangards