I would consider duped AA over Iceman but it's a really tough call. I'm doing it on my second account and there were so many fights AA could just roll right through at 4/55 sig 20.
Iceman would be most valuable on 6.1.6 if you do the all or nothing path, and then you've gotta deal with 6.1.5 Crossbones. I would rank up AA and Medusa, use AA on paths and Medusa for the relevant bosses (6.1.2 Sentinel and Ultron, 6.1.6, and there's a robot-heavy path in one level that she crushes).
Edit: assuming you aren't squeamish about it, just revive Corvus to kill Crossbones. Crazy damage, die before the Vigor regen, repeat a few times.
I would rank up AA over Iceman, and I'm saying that as someone who has them both. I mean I would definitely r4 Iceman as well, but AA is gonna do far more damage & end fights a whole lot quicker than Iceman.
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Iceman would be most valuable on 6.1.6 if you do the all or nothing path, and then you've gotta deal with 6.1.5 Crossbones. I would rank up AA and Medusa, use AA on paths and Medusa for the relevant bosses (6.1.2 Sentinel and Ultron, 6.1.6, and there's a robot-heavy path in one level that she crushes).
Edit: assuming you aren't squeamish about it, just revive Corvus to kill Crossbones. Crazy damage, die before the Vigor regen, repeat a few times.
We got same champs , most of it ! I too need some good champs to do act 6