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GameMastery Guide / Advanced Topics / Disasters / Volcanoes

Lava Bombs (CR 2 or 8)

Source GameMastery Guide pg. 234
Blobs of molten rock may be hurled several miles from an erupting volcano, cooling into solid rock before they land. A typical lava bomb strikes a point designated by the GM and explodes in a 30-foot radius. All creatures in the area must make a DC 15 Reflex save or take 4d6 points of damage. Creatures under cover or capable of covering themselves (like with a shield) gain a +2 bonus on this save. Particularly large lava bombs might sometimes occur, dealing 12d6 points of damage. Normal lava bombs have a CR of 2, large lava bombs have a CR of 5.