Depending on your level 100 armor/magic armor is pretty nothing. One chloroform attack in Arena and well come to stunlock town.
Also your guys are having 100 at wich level? 8? They surely did not have it at level 2 or 3.
At lvl5-6 you get that on each char (you can get more, but I feel it's the min you shall have).
I did Arena at lvl2 or 3, had no problem, first try.
Same for the frogs ambush, first try, no problem.
People are just no used to play tacticaly.
I never ever got my whole party stun-locked to any encounter.
