I picked up the Vanguard bounty from Xander this morning called 'Deathless,' where you must earn 10,000 XP without dying. I've been running around killing enemies for a while now, and the progress bar has not filled up a single percentage point. Not sure if I'm actually getting the points and it's just not displaying properly; I guess I'll find out eventually. I'm on the PlayStation 3.
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Don't know why but it works when you play crucible.