I've gotten so many damn graviton lances like I didn't choose it during the story. And now every single engram I have gotten has been a damn graviton lance. Is this really that hard to fix or change? And xur selling it? Wth. Why is that even in the pool? You're able to get all of the campaign guns, you guessed it, through the campaign. Armor I can understand as that's harder to get without making a ton of characters but come on. Why is the rng so crap? Why bungo why must you hurt us.
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From my own experience and seeing a few people post, never decrypt more than 1 exotic engram per visit to the crypturd. Decrypt, walk away for a minute or two. There isn't any hidden timer or anything, but results from the field indicate doing multiples results in increased chance for duplicates.