I have got about 75 hours game time in my lvl 31 warlock, the only exotic weapon I have is the thorn which I got from a bounty, and last week I bought the obsidian mind helmet, I'm always seeing threads about people who have 3 gallyhorns and all but one exotic, how many hours will it take to get even a few more exotics?!?!?!
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I just got plan c from a roc strike, i was pretty happy about that! Keep trying and you'll get more eventually