RNG dude. The past 4 exotic engrams I've decrypted have been 310 on my 310 titan
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It's only guranteed if you're 311 or higher.
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It's not guaranteed even when 311+, just there's a high chance for a 310
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Edited by awallo: 11/24/2015 7:48:34 PMI never get 290s as a 311