patrick_pkl wrote:
so do most poison chars use A3 poison merc?
This is really your choice; if you're a necromancer it's not necessary at all since you have Lower Resist. I believe poison necromancers choose A1 physical merc because it is potentially a very strong alternative damage type to poison, and serves for an easy start to Corpse Explosion spamming.
As for a Rabies druid or a poison amazon, you may want to find either a tank-type mercenary or just go for a different type of damage. I'd personally go for the latter--one type of damage isn't that great in hell.
If you're looking for other means of -poison res, you can find it on equipment, easiest to find on necromancer gear even.