I've poked around him and found that beating him solo without killing deers is just waaay easier then without(is enrage even beatable with less then over 9000 men?). Its just some sort of hard enrage, which makes him unbeatable by making him too fat and his attack range too big(normal attack range is somewhat fine, but jumping attacks can no longer be dodged by Wolfgang with walking cane(50% speed boost, son)). Knowledge is power and stuff, but that enrage is just garbage right now. Unless Ive missed something and there is a way of putting him out of it.
I know that new reign awaits and stuff, but making Klaus absorbing deers powers or something would seem much better then that. Making enrage phase really hard but fun and putting extra(and different) rewards to it would make it viable!