What is "Noxious" damage mitigation for?

[V4n]

We get several debuffs that reduce "noxious" damage mitigation, but no nukes that do noxious damage.  Am I missing something?

[Tanatus]

<DIV>Yes you are ... 95% our spells do save vs. Nox ...hint: Nox = poison and disease, Ele = heat, cold, Arcane = Divine, Mental, Magic = all</DIV>