>>529201823
Her gimmick is that she takes more damage the longer the fight goes, but deals more damage as well. So you want to spend some time learning her rotation, make sure to have instant death immunity on your party, bind when appropriate etc.
I actually fought her after doing most of the virtual mechagod ruins, so I had a lot of good gear and I was level 150. Her rotation's on the jp wiki too if you're interested. https://sanpingame.com/doujin/sequel_kludge/boss#mokuji-12