I have done hero, legends, and a master nightfall with no drops of PRE ASTYANAX IV (this week's bow) and any other time I would get the drop way before id have to run a master, usually a couple of hero's and I'll get it but even a master didn't drop it and now I'm curious that there's something going on. could be just really bad rng but at least I said something if it isn't.
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NF drops in Legend and Master to my experience: Common drop = 3/10 Uncommon = 2-4 guaranteed drops per run Rare = 1-2 drops every other run It's not worth it to grind the regular weapon unless double loot is active, and depending on the mission, even the adept isn't worth it. Only 1 group I've been in has been able to clear this NF, the rest keep falling apart when opening the door in the beginning.