That was the first legendary helmet I had for my hunter. I dismantled it though. Really regret it.
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Don't worry you still have a chance at getting it by grinding pre-dlc engrams on Vanguard Tiger Strikes, or by grinding Vanguard Rank and hope you get it from a package. (Yes it's possible to get pre-dlc items from Vanguard and Crucible packages.) This applies with Vanguard Roc strikes as well because you will get Dark Below engrams from Vanguard Roc strikes.