Week 27 31.28% Drop of an Exotic (still running) Week 26 36.66% Drop of an Exotic Week 25 57.58% Drop of an Exotic Week 24 50.55% Drop of an Exotic That seems to be statistically significant to me, though your first two weeks had far fewer votes. Is it possible that when the patch 1.1.1 went live they decreased the drop rate of exotics in Nightfalls from ~1/2 runs to 1/3 runs. I haven't gotten an exotic in three weeks, whereas before they were always dropping for me before then.