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<blockquote data-quote="Celebrim" data-source="post: 6929620" data-attributes="member: 4937">I ad hoc ruled a dust explosion about 3 weeks ago, after a I had a trap that involved producing choking dust clouds made of very fine dry particles, and some PC thought it would be a good idea to cast burning hands in that scenario.IRL, how much force a dust explosion has depends on the size of the particle, the density of the particle in the atmosphere, total volume of the dust contaminated area, and the average surface area of the particles.&nbsp; There are way too many factors to determine exactly based on the inputs (which are generally unknown) so the best answer is probably to make it reasonable for CR 1-3 type trap.&nbsp;&nbsp; I ruled his fire spell spontaneously transformed into a 5HD fireball centered on the emanation point of the spell (himself).&nbsp; Fortunately, he had fire protection up and the only other PC in the blast radius was a rogue with evasion, so little harm was done.More rigorous simulation would be to treat the explosion similar other explosives in your rules, probably with a combination of fire damage, with possible falling damage from being thrown (as if thrown or bullrushed, depending on the rules you have), and shrapnel damage if something in the area can get swept up by the explosion, and different degrees of effect depending on how far you are from the explosion.&nbsp; However, I didn't have anything prepared, and winging this works just fine.Keep in mind anything you allow, your PC's will copy.&nbsp;&nbsp; Flour itself isn't particularly dangerous, and I'd tend to make explosions of typical flour on the low CR end of the scale.&nbsp; Where you get dust explosions from flour tends to be in mills where very fine particles of flour tend to accumulate over time.&nbsp; Rice flour shed from rice abrading nearby grains is particularly bad.</blockquote>

[QUOTE="Celebrim, post: 6929620, member: 4937"] I ad hoc ruled a dust explosion about 3 weeks ago, after a I had a trap that involved producing choking dust clouds made of very fine dry particles, and some PC thought it would be a good idea to cast burning hands in that scenario. IRL, how much force a dust explosion has depends on the size of the particle, the density of the particle in the atmosphere, total volume of the dust contaminated area, and the average surface area of the particles. There are way too many factors to determine exactly based on the inputs (which are generally unknown) so the best answer is probably to make it reasonable for CR 1-3 type trap. I ruled his fire spell spontaneously transformed into a 5HD fireball centered on the emanation point of the spell (himself). Fortunately, he had fire protection up and the only other PC in the blast radius was a rogue with evasion, so little harm was done. More rigorous simulation would be to treat the explosion similar other explosives in your rules, probably with a combination of fire damage, with possible falling damage from being thrown (as if thrown or bullrushed, depending on the rules you have), and shrapnel damage if something in the area can get swept up by the explosion, and different degrees of effect depending on how far you are from the explosion. However, I didn't have anything prepared, and winging this works just fine. Keep in mind anything you allow, your PC's will copy. Flour itself isn't particularly dangerous, and I'd tend to make explosions of typical flour on the low CR end of the scale. Where you get dust explosions from flour tends to be in mills where very fine particles of flour tend to accumulate over time. Rice flour shed from rice abrading nearby grains is particularly bad. [/QUOTE]

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