Farming for hours and not getting a single key, there needs to be a more reliable way to get a treasure key. Such as trading in Tokens of Identity, Flight, and Judgement for a key or 2 for 1 trade off. Another is doing all Petra's bounties for the week rewards you a key, this encourages people to continue to go out into the wild after hitting max rank with Petra.
Any other Ideas?
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Xur sells them for 23 strange coins a piece You can earn them from faction packages They can drop from raids We get a guaranteed one from nightfall and/or level 30 heroic Trade one exotic shard for one key