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Chapter 2: Building Games / Environment / Natural Disasters / Volcanic Eruptions

Lava Flows

Source GM Core pg. 97 2.0
Lava flows are an iconic volcanic threat; they usually move between 5 and 60 feet per round over normal ground, so characters can often outrun them. However, flows can move up to 300 feet per round in a steep volcanic tube or channel. Lava emanates heat that deals minor fire damage even before it comes into contact with creatures, and immersion in lava deals massive fire damage each round.