Material spells that conjure a large body of material below the point of casting.
Causes a large rectangular area some distance beneath the caster to be filled with Flammable Gas. Only open air is filled, any existing matter remains the same at the time of casting.
Considering the harmlessness of Flammable Gas itself, this spell can be considered rather weak. Even if you light it on fire it will only last for a couple of seconds, and since gas rises upward you'll probably be immersed by it by then which mean you'll mostly just torch yourself.