I did the Eye of Gatelord farm. Kill him and grab exotic engram if he drops it, immediately go into orbit (you have to do this quickly or you have to restart mission). Reload checkpoint, use coin, rinse, repeat.
Got two Telestos, Fourth Horsman, year 2 Invective, Immolation Fist, Sealed Ahamkara Grasps, 2 year 2 Crest of Alpha Lupis and a year 2 Insurmountable Skullfort.
Exotic engram drops every 5 to 9 coins used on average.
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So does it work better to use 1 per time, or several at once?
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One coin each time you kill a boss. Using multiple coins at once is a waste as far as I know.
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That's what it seemed like to me too. Thx