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GameMastery Guide / Advanced Topics / Disasters / Volcanoes

Lava

Source GameMastery Guide pg. 234
Lava flows are usually associated with nonexplosive eruptions, and can be a permanent fixture of active volcanoes. Most lava flows are quite slow, moving at 15 feet per round. Hotter flows move faster, achieving speeds up to 60 feet per round. Lava in a channel such as a lava tube is especially dangerous, moving as fast as 120 feet per round (a CR 6 hazard). Creatures overrun by a lava flow must make a DC 20 Reflex save or be engulfed in the lava. Success indicates that they are in contact with the lava but not immersed.