Just play and when you get it you get it. Although i'm a bad example because since this new dlc i don't play destiny much. I come on to get my armor core and do nightfalls each refresh and that is it now. And don't stress over maxing legendary weapons to much. Because once the new dlc comes you'll just be doing it all over again...and AGAIN...AND AGAIN. Lol
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Yup I agree You only really need 1 etheric light Then you are guaranteed 3 a week You get 1 to 34 do level 34 get 2nd character do level 34 again now you have 3 Keys are a different story but IMHO none of the guns do I really need Rare coins were at that as well to start