Corpsefire with conviction, sure!
Merc Death count: 7
Eventually got it done..
Cold plains, north to the wp. Immunity? 33 light res merc? you get the point.
Merc Death count: 9
I stopped after this one. I am finally at a point where I could play the game without killing much stuff at all.
Light immunes must be passed and all other bosses treated with care or ignored.
I doubt that I would have any problems with act bosses but this is not all about finishing the game, I want to kill stuff and not with trouble.
Therefore I decided I'll do Baalruns until I feel absolutely comfortable, including better merc gear, he lacks damage and leech. I want to swap tals mask to him after getting a gaze for example, or get him an eth gaze, whatever happens first :-P