Being around that level, I'm assuming they have completed or are at least close to Act IV.
The first quest of Act IV, called the Fall of the Heavens or something like that, is where you fight off a ton of those shadow beast things and a rare. After this one fight, the quest is over. I did this on nightmare (as I was only level 48 and 50 was required for hell) and at that level it gave slightly more than half a bar, though it would probably be more at a lower level. This doesn't sound like much, but when you can do it 2-3 times in five minutes it adds up fast.
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