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Message: <blockquote data-quote="Ahnehnois" data-source="post: 5758611" data-attributes="member: 17106">I'll address the basic premise here. Metallic potassium is very unstable and reacts violently with water as well as air to form some sort of ionic compound (a salt). This salt, conversely, is very stable, and while it is subject to being dissolved in water, will not participate in many chemical reactions in an Earthlike environment. The potassium in a living creature is in the latter form (a dissolved salt). Its role in biology is mainly in regulating the electrical potential of a cell. A psionic sinew, if a living creature, would consume and use potassium, but its energy would come from fat, carbohydrates, and proteins like everyone else.But since we're talking fantasy, it's worth noting that the role of potassium in neurons is to normalize a cell after an action potential. You could maybe say that the vigor ability has something to do with your cells being aggressively normalized after injury to justify an increased need for (ionic) potassium; or say something similar for inertial armor.***OTOH, if you want to say that the scenario of a breeding pool using metallic potassium is developmentally important, okay. Just make the pool something other than water (for reasons described above). Just use some sort of organic liquid, or a fantasy material, or have the thing take place on the Astral Plane where there's no air. I suppose some fantastical creature could slowly metabolize metallic potassium, which would provide an awful lot of energy for growth. And maybe after getting acclimatized to the ionic potassium byproduct of such a reaction, they would be drawn to the salty touch of a humanoid.***Of course, as long as you don't call it "potassium", your players won't know or care.As exergonic as the oxidation of potassium is, I think you've rather overstated the case. When dropped it water, it fizzles but it's not a huge explosion. Also, skin and hair would be much less reactive with the metal than air and water would.[ame=http://www.youtube.com/watch?v=N2451rpcKuc]Potassium Metal Reaction - YouTube[/ame]That being said, there's nothing wrong with dramatic license.</blockquote>

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