Pre-RoI it would take two or three instances of stacking two 3oC to get an exotic. Post-RoI I have used about 12 with zero exotics. I mean, I haven't got an exotic engram with or without 3oC while doing Crucible, story, or patrol since RoI release. What's up with that? Are drop rates significantly reduced to begin with, or do 3oC no longer work? Please enlighten me!