Just wasted 20 3oC on iron tomb. No exotics. Funny thing is, I was doing it before the daily reset and now it's not working.
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Yeah, it's pretty random, I went 10 3oC and got maybe 5 or 6 exotics From there i used maybe 15 more . . . AND NOTHING.
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It's all random... I have gone 30+ coins and get 1 exotic