Build up your reputation with the vanguard or crucible and buy your legendary gear with marks. Rank 2 gets you armor and rank 3 gets you weapons.
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Is that just missions that earn you vanguard marks?
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You earn marks from strikes, weekly & nightfall strikes, exchanging materials to the quartermaster and from doing public events. They all give reputation and marks. You can only get 100 marks a week then you "cap out".