Honestly it’s so rarely physical damage that kills my merc. Especially on my warlock that has a hephasto screaming in on top of them first. With the a2 merc I’ve been going guardian angel, Kira’s, and reapers toll. He also did well with obedience, tals helm, treachery.
I just tried using act 5 merc with hustle sword, head striker, treachery, and arreats face and it’s ok. He didn’t die one time with sazabis and hustle. If I’m trying to be a chad about it I get might or fanat on my demon then use whichever merc that gets me the other.
Himself wield infinity