not much usually. so why make us do it?
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Expectations, basically. It's why there's a power minimum for adept and heroic nightfalls, but there isn't one for legend or master. If you want to team up with a couple of 1100 players and attempt a master nightfall, that's on you, best of luck. But if you don't have control over who you're matched with, then you at least expect to get teammates that are able to damage enemies.