Natural Immunities
Natural immunities describe attack forms that either have a lesser effect upon creatures, or which have no effect whatsoever. This first variety is called a "resistance," and may mean that the attack form is minimized or that the creature receives an unusual saving throw bonus against that kind of attack. Creatures with a great many immunities can be hard to destroy with magic or with weapons; most creatures like this are unearthly, from other planes of existence.
Immunities fall into general categories; these include immunities against disease; substances (acid, gas, poison, wood or metals of any kind); elements (cold, electricity, fire); and magic (items or spells). "Full immunity" means that the creature is not affected at all by these things. A "%" immunity means that the creature removes that much damage or effect from the attack form.
Immunity Forms
The following is a list of identified natural abilities possessed by monsters. As not every monster's immunities are presently known, this list is necessarily incomplete.