Ok, I have run into a obstacle. On The campaign mission 4 afaik I've just met Neurothrope. I've tried everything only left the unlimited health on for obvious reasons and still not even a flesh wound. I've tried multiple ways with multiple weapons (chainsword. Bolter and mini bolter. I'm missing something, could you help?
It's annoying, I've left off the weak enemy as it causes problems with "boss" fights.
have you checked a lets play on youtube?