I just finished all of Petra's and variks' quests, and I thought that's how you get Boolean Gemini but it didn't give it to me.
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Edited by Lostypoo: 1/15/2016 9:46:16 PMDid you do the quest lost and found and did you achieve rank 3 with queens wrath? Here's a guide http://www.primagames.com/games/destiny/walkthrough/destiny-taken-king-how-get-boolean-gemini-exotic-scout-rifle