Did any1 kill that guy so far? if yes I'd like to know on which diffculty, because according to this:
http://destiny.wikia.com/wiki/Xyor,_the_Unwed
that guy should only spawn in Nightfall
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#Destiny
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I killed him on the special strike for the "thorn" hand cannon i had to do it solo as 3 people makes it too hard imo