Detect Harmful Gas

Useful in mining and underground exploration, this spell enables the caster to detect the presence of harmful gas in a sphere 60 feet in diameter around the caster. The primary use of this spell is to detect underground hazardous natural gases such as explosive methane or poisonous sulphur, or toxic gases like carbon monoxide, but this spell can also detect any other harmful gas that occurs naturally or is produced by alchemy or magic.

In addition to revealing the presence of such gases, the caster has a 5% chance per level to identify the specific type of gas found (for example, chlorine gas, methane, or carbon monoxide), to a maximum chance of 75%. Some rare, exotic gases might be beyond a priest's ability to identify exactly, although the identification roll may indicate the possible danger from or effect of the gas.

The material component of this spell is the priest's holy symbol.