You actually can't reset the zone to get different mobs once you get to 60, which is when you deal with the most difficult combinations anyways. Well, you can, but you really don't want to. Whenever you kill an elite or group of champions at level 60, you get a stack of Nephalems Valor, which gives you 15% magic and gold find. Stacks up to 5. You lose it if you leave the game, so you really don't want to do that.
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The batman villians all seem to be one big joke that batman refuses to laugh at - SantaRPG