This boss is dumb, Catwoman can deal 100k damage in one basic attack hit. How I did this (I didn’t even realise this until it happened) was to let Catwoman hit me after she tags in while in a special animation, as currently her passive seems to be bugged as it drains about 3 bars of power per hit. 2 piece Lexcorp gear means that I can reverse the power drain and so I gain 3 bars of power every time she hits me so, combined with the Ibistick, I can use Arkham Knight Batman’s 2nd move repeatedly thanks to 2 piece Lexcorp, and he gets healed thanks to the Lexcorp chestpiece and also there is a 16% DOT applied thanks to Ibistick and the Lexcorp helmet to Catwoman which is what causes her to take enough damage to be KO’ed. I only discovered how you can basically cheese this fight during this go, so I was lucky to be able to pull it off. Killer Frost also comes in handy to reduce her power gains so she can’t use a special attack which would basically be an instant KO. Also the stats are bs, I dealt 2.5 million damage (over 1.5 million of that dealt by my Arkham Knight Batman) when Catwoman apparently has only 500k health while neither Nightwing nor Batman have over 100k. You also just have to get partially lucky and hope that the opponents just act in a way in which you won’t get screwed over.