Druid's spirits are great samples to explain that. They are immune to poison in NM and hell, and DR% is 100% in nightmare.
Another interesting thing is to creat a "elemental immue" iron golem using items with high resistant bonus. Integrating with summon resist, they are invulnerable to elemental attack.
Another interesting thing is to creat a "elemental immue" iron golem using items with high resistant bonus. Integrating with summon resist, they are invulnerable to elemental attack.