Format: 
cast 'noxious cloud' <target>           cost: 12 mana

   Noxious cloud is a mid to low level offensive mage spell.  The caster
conjures forth a cloud of putrid gas, which engulfs the target.  The immediate
effect is to choke the target, causing some initial damage.  The cloud then
continues to hover about the target for some time, reducing charisma and
regeneration.

Protections against this spell are the following saving throws:
Saving breath :  resistance to gaseous attacks in general.
Saving spell  :  helps negate part of the spell before it can be attached.
Saving poison :  reduces initial damage from the attack.