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This system is expected to encourage players to stick with a skill build of their choice, select an area of the game they enjoy, and sweep it for rare and champion packs on their way to a boss, finishing off a run with a boss that’ll be worth killing. If you wanted a shorter play session you could be done at that point, but if you have more time, the path of least resistance would ideally be to stay in the same game and make your way towards the next boss.
New:
It seems the buff can stack up to 5 times (at least on Hell difficulty) while gaining 15% magic find and gold drop for each stack. The buff lasts 30 minutes and is reset whenever you kill a new elite stack. You do not lose the buff if you die
==References==
* [http://us.battle.net/d3/en/forum/topic/4241234476/ Nephalem Valor explained on the official Diablo 3 website]