I'm currently DMing a play-by-post D&D 5e game. The module I'm using involves the party battling trolls in stables. Defeating trolls involves judicious use of fire damage. Stables are also often filled with (flammable) hay.
The party has its share of spellcasters who love to use fire to solve many of their problems in combat, and I've made it clear (without specifics) that using spells which include the words "A flammable object hit by this spell ignites if it isn’t being worn or carried" incur some risk of that fire spreading.
I've searched for posts regarding how to handle the spread of (nonmagical) fire, including the smoke it may generate, but have only found a few questions regarding specific spells, or this question regarding damage from one grid hex/square. Comments have additionally noted these two questions:
Beyond these questions:
- Are there any rules or guidance in the PHB, DMG, or other published modules or guides that I can reference to avoid making things up as I go along? Specifically I'm looking for how fast it might spread, and how much smoke it may generate (and what impacts that would have on the characters.)
- One would assume given the ease of starting a fire that it should be equally easy to extinguish magically but I've seen very few. I don't particularly want to give the players an unsolvable problem. How hard is it to put out a fire you accidentally start?