Poison: Poison damage can be inflicted both as a result of 
being poisoned or as a damage type.  It can be injected, ingested,
or as contact poison -- immunity to poison does not make one immune
to poison damage.  Poison is aligned with Earth and Water
as the "toxic liquid", and represents the slow damage of
a living being on a cellular level.  Armor protects very
little against poison.
See also: HELP POISONING