I needed 2 last minute strange coins to get Gjallarhorn and so I was acquiring engram's and then thats when I got a legendary heavy engram. LOW AND BEHOLD IT WAS GJALLARHORN.
Edit: Thanks for the supports everyone, hope you all find luck in your travels!
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#Destiny
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I think the game was trying to troll you and give you the launcher after you bought it, it just didnt expect you to actually decrypt that legendary before hand