>>542666157
There's a particular timing to the fight you need to survive the highest damage attack, but you're still going to need some Power to help you survive and push through it. In my experience, without macro btw, it wasn't that big of a wall as Mirror Container or Behemoth. You will get past it soon.
I think the chapters after that are hard but fair. If you have Ein for the water chapters and Summer Dorothy for the fire chapters, you will be good. But be prepared to rage even harder at the regular stages than you did with Black Snek. Ch 39 and 40 have some really frustrating stages.