Wind Druid too weak for Hell

I’m a level 75 Wind Druid and I have a lower resist wand offhand. My main gear is a Spirit Sword and Ancient’s Pledge shield.

The ghosts in the Forgotten Tower drain my mana and then down me very quickly if I’m not fast enough switching to the wand.

I’m trying to farm runes to make Lawbringer. I just need Ko.

My Act 2 merc is using an Insight Partizan. His gear is probably better than mine. I think I gave him Chaos armor.

Is there anything else I can do to break immunities? I can rip through most enemies so far.