Frankenstein has 2 lives (Nomal and Revived). Normal has 2800 hp but when he dies he gets the Revived form (2100 hp) Meaning together is 4900 hp in total so its a hard enemie.
I have some questions like why the witches didnt give the giant skeleton a buff potion ot will be hard or Frankenstein didnt say the unfunny joke "oh i didn't die" or didnt change the jack-o-bot character and use the old one and Where are the witches?
Giant skeletons (early), frankensteins, sins, and reapers are the only threats there and you could easily beat them if you’re smart enough. Also, it took me like 4 tries to beat that act