Oh, right sorry, I didn't think to check Normal/Hard!
Sounds like you've managed to complete the challenge already, but I think I managed to get around that Chopper's passive using The Prisoner.
Well done!
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Thanks mate, been a good day in general too, dropped G banshee, S banshee, Eda Valkyrie knight, G Irigami, M chopper, iron maiden eddie, gunner dog, and gunner undead allied soldier been after the last 2 for ages but they never ever dropped. And moved up to king iv in arena lol