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Cake day: June 8th, 2023

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  • What do you mean official statblock? As in it’s a statblock from the dmg/mm? Then they can still just tack in things they want/need (as can you, as dm).

    I agree they probably could (and should) have better specified that this diverges from the stat block, but the point of the module is to try and cater to everyone, including rewarding players that took points in perception here apparently.

    I think it’s got its pros and cons, I’m very fond of seeing all the rules and following them, even as a dm, so 3e (and Pathfinder) were always more my thing, but having played 5e nowadays (and other, even more “you have a 5 damage power, flavour it however you like” like mutants & masterminds) I kind of like the dm style of “know your players, make exceptions where it would increase enjoyment and/or add an interesting challenge without breaking the future fun of the game” too.

    Arguably that’s the difference between DM and GM. A DM is just running a dungeon. A GM is running the whole game, rules and all.

















  • Close, but now you come into contact with the atmosphere not actually being the same density (in weight/volume as well as in particles/volume) throughout, but instead gets thinner as you get away from the earth.

    For simplicity, assume space is actually empty, and the atmosphere gets thinner linearly up until x kilometers above sea level it’s completely empty. Then the density will also decrease with height, and the helium balloon will eventually find a spot that matches its density, and stop there.

    Again there’s so much more to it but as a simplified model this works 😅

    Rockets mostly need to fight speed (of the earth revolving around the sun), and indeed in our atmosphere speed means friction, but in space rockets still need a lot of propellant to change their trajectory. As always there’s a relevant xkcd: https://what-if.xkcd.com/58/


  • The very short answer is that gas pressure is mostly proportional to the amount of particles per volume.

    So a balloon filled with helium has X particles per cubic cm, while the air around it has the same amount (instead of getting crushed). But because helium is a lot lighter per particle than standard air, this makes the balloon lighter than air, and like trying to push an air-filled balloon underwater, this helium-filled balloon floats to the higher layers of air, until other smaller forces also start to matter and the balance is restored.

    So a “vacuum-filled” balloon has nothing to give counter-pressure, but a balloon filled with helium definitely does.