Merit rewards are going to be the only way right now, unless the devs decide to raise the drop rate. It's going to take a long time, years, before I can get to this point but that's all the fun.
Also updated build with alpha level incarnate. I forgot how much easier min/maxing is with incarnates.
http://www.cohplanner.com/mids/download.php?uc=1538&c=710&a=1420&f=HEX&dc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