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GM Screen
GameMastery Guide
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Advanced Topics
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Disasters
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Volcanoes
Poisonous Gase (CR 5)
Source
GameMastery Guide pg. 234
One of the more insidious threats of a volcano is toxic gas, often escaping notice amid the fire and destruction. A wide variety of poisonous vapors can result from a volcanic eruption, some visible, some unseen. Poisonous gas causes 1d6 points of Constitution damage per round if inhaled (Fortitude DC 15 negates, the DC increases by 1 per previous save), and visible gases also function as heavy smoke. Poisonous gas clouds flow toward low ground, and are typically 50 feet high. Gale-force winds can divert gas clouds, as can high barriers—provided the gas has somewhere else to go.