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GM Screen
GameMastery Guide
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Advanced Topics
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Disasters
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Volcanoes
Pyroclastic Flows (CR 10)
Source
GameMastery Guide pg. 234
Some volcanic eruptions create a devastating wave of burning ash, hot gases, and volcanic debris called a pyroclastic flow that can travel for miles. Treat a pyroclastic flow as an avalanche (Pathfinder RPG Core Rulebook 429) traveling at 500 feet per round, combined with the effects of poisonous gas listed above. Contact with the searing-hot debris of the flow causes 2d6 points of fire damage per round, while any creature buried in the flow suffers 10d6 points of damage per round. Only reality-warping magic like miracle or wish can turn aside or impede a pyroclastic flow.