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Message: <blockquote data-quote="Helldritch" data-source="post: 8439964" data-attributes="member: 6855114">There are different types of frost burns and coolant will kill you if you're unfortunate enough.On the contrary, extreme sudden cold will not harm inanimate object unless the temperature difference is extremely high. A heated refractory wall is almost like stone or concrete and extreme heat or cold will not harm it unless the temperature difference is in the thousand. There are heatcurves to respect to dry the refractory but once these are done, you can pretty much heat them up quite fast. Colding is even faster.But to see refractory stone litterally explode, you need much more that what you imply in here. So much that liquid nitrogen do not even harm stone but will fragilize it. If allowed to heat slowly it will be as if nothing had happened. (and here slowly is to determined, could it be 10 minutes? 20 minutes? I don't really know as I have never done this experiment.) Hey, glass can support sudden extreme cold without any trouble. As you pour liquid nitrogen, the glass does not suddenly go boom! Nope, these were the ones I had in mind all along because guess what? This is what I am working with all the time. And the link you provided also speak a lot about powder extinguisher. Almost every notes are on these. Not much on CO2 extinguishers. Sometimes, your line of work makes you forget that others are not necessarily working in the same line of work as you. I plead guilty on that one.Which brings us back to liquid nitrogen that will not harm glass but will kill the poor person that is unfortunate enough to be immerge in it...For the moment, all adventures written has been with Waterdeep in mind save two? Hey, we even get the SCAG, this is the only "official" setting we got unless you count Ravnica, Theros and Tal Dorei.Ok. Let's keep to the village. What tells you that there is not 5th level casters in it able to cast that damn spell and that does it whenever it goes off? Nothing. You simply can't hand wave this as this is not yours to say but the DM's. No, but the duke will send a scribe that works for him to do the job. And if the demand comes from the king he will send the scribe with pleasure.Wizards did not exist. So we can't know for sure aren't we? And 5th level isn't that high level. Quite easy to do.Wizards are not the only ones able to provide this service. Clerics can too.If we take a small village described, most priest in a small village church will be able to cast this spell. In fact, if you follow the rule and only have access to the MM (and no splat book) all priests in a church are fifth level (not counting acolytes) so all priests in a small village can and will provide this service. And in a small village, that service might come up what? Once a year? Once every two years? Maybe even less? Jails were not that often used for reasons I told you about.This is what we call a convenient approximation to hasten gameplay. Do you imagine if players were litterally forced to haggle everytime they wanted to buy something? This would remove precious play time. So conveniently, we abide by the convention that in the PHB, the players are expected to pay these prices. And guess what? In some adventures, these prices are higher than what the PHB states for "reasons". They are there for the players. Not the NPCs.</blockquote>

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