Poison

When you are exposed to poison, you are required to make a saving throw (usually fortitude) vs. the poison's difficulty class. Your character will have a modifier to this saving throw that is derived from your class levels, and your race- and is potentially modified by what enhancements and feats you have taken, as well as whatever buffs have been cast on you, and what equipment you are wearing.

Sources of inflicting poison

 * Poison (spell)

Sources of resistance/immunity to poison

 * Dwarf race (+2 bonus and enhancements to increase it)
 * Warforged race (immune)
 * Proof Against Poison item enhancement (immunity)
 * Poison save item enhancement
 * Neutralize Poison spell (dispels poison; existing damage is not healed; grants immunity for a duration)