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Message: <blockquote data-quote="DarkKestral" data-source="post: 3111260" data-attributes="member: 40100">Err.. 100 grams of pure Cl2 is roughly enough to kill 30 people in a ~10x10x10 room, assuming no leakage, in about 30 minutes, IIRC. They will note a smell, however, and begin coughing WELL below that amount.Also, depending on how long the exposure is, it can be lethal in very small concentrations,  around as 30 ppm though it will take 30-40 minutes 'per dose'. Around 1000 ppm (one gram per kilogram) it will kill in a number of breaths. Thus, if you REALLY need to know how deadly it is.. you'll have to do some math, since you'll need to figure out deviations from a chemist's STP and the size of the room. However, without doing the math, I'd say that, with a dose like yours, you'll need 30 minutes or so to kill with it. After 15 minutes, your PCs will probably be really getting some major Con damage. Perhaps a bit less, but not by much. However, nausea, burning, and minor asphyxiation will have set in in a matter of minutes. Blinding would simply be a matter of whether or not your PCs close their eyes. At that concentration, it's probably not going to be visible, though their eyes would itch something fierce.The main problem with d20's poison rules is they are not great for long term dosage. They are excellent for one-shot poisons, like most assassin poisons, but for time-dependent poisons, they are very poor. A 'one-shot' version of chlorine will kill almost immediately, but a realistic slow version may just have the PCs use something like Vigor or one of the con-booster spells and then the PCs may just ignore it.EDIT: Heap... the PDC would be for purchase. DC 15 to produce would be to get it from water and salt, which means it's ALMOST PDC 0 to produce, but perhaps PDC 3-4 to buy the necessary glassware. However, production would produce NaOH in the bargain, providing a concentrated base with which to make 'acid' flasks...It wouldn't be possible to take 10 on the checks, since the penalty for failure could be self-exposure to the poison. A Smart Hero-type Talent or AdC/PrC ability might allow a 10 on the check, however.</blockquote>

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