Just curious on the results.
Xur has sold Ghorn before, but never Thunderlord (aside from PS exclusive exotics, I think it's the only one he's never sold). And from what I've been hearing from several day-1 Destiny players, is that the only exotic weapon they are missing is Thunderlord.
Personally I got Thunderlord sometime back in September or October. But only recently got Ghorn as a random drop. So for me, Ghorn was the rarer one.
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Got 4 ghorns and one thunderlord, thunder was my last exotic I needed before dark below. And I got it from hard Crota once it came out