Use it on any difficulty but wait for the weekly reset on Tuesday, since you will be guaranteed an exotic weapon.
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Yeh not a sure thing exotic look at it as another nightfall roll could be exotic but might not
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Nope your not guaranteed an exotic that was only first week
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Unfortunately not guaranteed exotic each week first time tried this week got her mercy again
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can also confirm not guaranteed unfortunately. Maybe it is a higher chance? But I used one on a 32 last night and no exotic dropped for any members of my team.
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Not guaranteed. Just used my first treasure key of the week and got a Dreamwaker, again
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Why guaranteed?
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Supposedly there's a weekly reset on a guaranteed exotic from the chest. That remains to be seen since this isn't a week old however.
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I'm not sure, but that is what I heard from someone