LOL the Shadow Boss is quite easy ... (you only need to reduce the focus below 100 and he does't can kill you) and to the Dr.Herregods (The boss with 1 million hp) you can beat him whitout subversion (you need more time to get him down but if he have no focus he can't heal himself anymore) in my opinion the hp's of this 2 bosses must be changed ^^ good luck all