Since day 1 of D2 I've never found one single Antiope-D. NOT. A. SINGLE. ONE. Yesterday, I opened more then 75 Banshe's Engrams. I got EVERYTHING but not a single Antiope-D. Last days I opened hundreds and hundreds of them, stil nothing! I talked to other players and they told me that they got the same problem: they simply can't find the Antiope-D, they've never found one! It's like that some players can't find it, like the -blam!-ing thing is bugged for some reason or is locked. Wtf?
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Are you sure you're grinding in the right places? Not all vendors have it in the pool. Preview the would-be engram in the vendor's inventory to make sure you see if there. If not, hold on to your tokens until their inventories change. I've had at least 40 drop this year.