Ple-Sen
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Can't you just tank the tank until his buffs run out and then finish him with a death spell? Since they all move as a group.
Whitecalm and Lorican have bows and are positioned in the center. They can hit any character on the battlefield except Stephanie. Even aside from that, while the cavalry might still potentially ride away, Nelia and especially Axel won't be able to do so. I can go invisible, but that's just me. And it's not really a problem for me, generally speaking.