Continuous Breathable Air
(Alteration)(Elemental (Air))
Reversible

Range:  6 yards
Components:  V, S, M
Duration:  Until dispelled
Casting Time:  3
Area of Effect:  20-yard radius sphere
Saving Throw:  Negates

This spell causes the affected area to have breathable air until the spell is negated, as long as the surrounding pressure will allow it (eg., in shallow water the pressure will not remove the spell, in deep water the water pressure will reduce the area of effect considerably).
This is handy for emergency breathing supplies within a poison gas area, stinking cloud, etc. It is also in great demand by owners of mines to ensure that the mine continues to be workable. It is also handy cast on the inside of helmets to provide a flow of fresh air out of the helmet, thus giving a positive air pressure, allowing the user to continue to breathe underwater <at fairly deep water pressures) and also helps to counter many of the effects of poison gas or stinking clouds (save at +4).
The reverse, continuous unbreathable air, will cause the air to become totally unbreathable, causing choking (1d6 per round while within the area of effect) and making it difficult to cast spells (save versus spell to be able to do so). It also allows for some nasty traps in the bottom of pits, etc.
The material components are a vial of oxygen for breathable air, and a vial of poison gas or stinking cloud for unbreathable air.

