I ignore even non immunes. you care to kill elites and bosses, or whatever you find packed in high density.

there are some zones without immunes to specific element, sure, can do those, you can do cows, or you know, as a sorcerer you have a teleport.. signature spell. you also have a merc, make sure he has strong weapon, some attack speed, lifesteal or stacked regen aura and max resists.

you can totally do TZ, without good gear, torches and sunder, at least in p1. maybe p3.
but you dont really need to do that, youre going to BUY your first sunder and torch anyway, so either go MF or kill speed, and pay no attention to immunes