There's no other way to do it, other than bounties. Which, for some weird reason, are only given once per week.
English
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Hello! So i'm new to Destiny and I was wondering, where do I find these bounties you speak off? I've been searching internet the last few days, but I seem to miss something. I've read that once a week you'll get a treasure key from completing these bounties. And I like them keys! Thanks in advance!
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U need to complete the taken war Petra quest line then u can get the bounties
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Off of Petra in the Reef for treasure keys