
Whale_Cancer |

Looking at the rules for wood structures and various fire effects... objects take half energy damage, but there's no rules for actually lighting something like a house on fire.
Yeah, I'm not happy with the new energy rules either. They do, however, state that certain materials can be made vulnerable to certain types of energy by DM fiat.
I'm upset with how much it underpowers acid damage (which used to ignore hardness).

Foghammer |

Does everything need rules, or can some things be left to common sense?
Common sense isn't... well, common.
Not everyone will agree on how long it takes for something to catch and/or burn completely. There are already rules for dealing damage to structures in some ways, but not this one.
Because I could not find rules for it does not mean they don't exist, it just means that I may not have looked in the right place.

Foghammer |

One of the Council of Thieves AP books had rules for disasters, including fires in a house and city. I think it was #5 or #6, but I don't have access to them atm.
This proved helpful. Even if it's all up to the DM how it goes, it gives solid guidelines on spreading and consumption times. Thanks! :)

Treppa |

This D20pfsrd entry has some of the rules from Council of Thieves. I know there are more, but I can't put my hands on the book.

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Fires IRL takes mere minutes to become a conflagration, but in terms of a 6 second round of combat its not exactly a game changer. But throw a pint of oil and light it in a wooden structure and you'll start a fire. Have it spread to adjacent squares each minute (which exponentially spreads faster and faster). Add in smoke and heat effects and viola structure fire! Remember that the damage takes quite a bit of time to destroy a structure representing the hardness.
--Lava Vrock