In most cases they probably won't even notice what's going on, assuming they continue deeper down the dungeon they'll pass out before they figure out it's monoxide poisoning (if that concept is even known to anyone in the party)
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In most cases they probably won't even notice what's going on, assuming they continue deeper down the dungeon they'll pass out before they figure out it's monoxide poisoning (if that concept is even known to anyone in the party)