Its not a big deal, the discipline on it is trash. I got mine from an engram and got rewarded with 50 more discipline than the one he's selling. I wonder if Xur always sells exotic items with low stats, and to get items with higher stats you need to "EARN" them as so many people like to say. Lets be honest though, its a combination of luck and trading your real life time for an imaginary item.
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Yea those are all pre set. For me, it doesn't matter about the amount of discipline, for the rest of my armor provides enough to have 90% bonus
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My Light beyond nemesis has less base strength bonus than the Xur bought one.