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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The drop rates in this game can be atrocious sometimes. D2 could definitely benefit from bad luck protection. I've done 43 strikes and 2 nightfalls so far on my Hunter (trying to get the new bone themed ritual armor) and I got the chest piece on my 37th strike and that's it. 45 strikes for 1 drop.