It's time this question gets a responce from bungie. Bump if you agree.
Edit. I didn't realize there were so many spoiled brats on here.lmfao
Edit. I received my first Gjallahorn from Hard Atheon just before weekly reset and still think Xur should sell it.
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I heard he doesn't sell gjallahorn because that's the only exotic Deej doesn't have, and xur is programmed by a a few employees, but they don't sell gjallahorn because that would be to Deejs benifit.