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!
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Having similar problems, though I'm not tracking it to a tee, where it seems I'm tearing through coins. I only use a single coin and bounce around to allow for the 'undefined' timer, (thx for that Bungie - you can timer ammo syn' but not a coin...), and was having good success with exotic drops. Now not so much. THey drop but takes a lot of different runs - Strike, pvp etc.