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Farm engrams after doing the weekly strike. You get 9 in total if you beat the highest level one, 3 for each difficulty. After that it's all luck in engrams.
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Weekly heroic strike gives 3-6. Engrams can give 1-3. You can also get then as rewards from PvE & PvP.
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Trade material and or glimmer to Xur, and do weekly strike
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Play the game?