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Chapter 10: Game Mastering / Environment / Natural Disasters / Volcanic Eruptions

Ash

Source Core Rulebook pg. 519 1.1
Ash from volcanic eruptions is hot enough to cause minor fire damage each minute. It limits visibility like a thick fog and can make air unbreathable, requiring characters to hold their breath or suffocate (page 478). Ash clouds generate ash lightning strikes, which typically deal moderate electricity damage but are very unlikely to hit an individual creature. Ash buildup on the ground creates areas of uneven ground, difficult terrain, or greater difficult terrain, and ash in the atmosphere can block the sun for weeks or even months, leading to colder temperatures and longer winters.