I'm A Banana
Potassium-Rich
I'll indulge. 
These are all IMC, btw. By default, cold iron works vs. fey, demons, eladrin....silver works vs. lycantrhopes, devils, archons...adamantine works vs. constructs
SILVER is the Blessed Metal of the Moon. Highly skilled weaponsmiths can make versions of this metal that are basically as functional as a steel weapon. Because it is of the moon, it forces a painful reaction when lycanthropes are wounded by it. It is used in many rituals to control water, and is precious to the elves who worship the moon. Regarding it as based on something that changes and flows, rather than being constant, devils and archons find that it is able to dissolve much of their innate protections, especially when pared with good or evil alignment-energies. Silver is also valuable as a currency, due to it's rarity. An upgraded form of Silver is Mythral, which the elves fashion well.
GOLD is the Blessed Metal of the Sun. Highly skilled weaponsmiths can make versions of this metal that are basically as functional as a steel weapon. Such blades hold heat well, and are said to be especially potent when used against water-based elemental creatures or oozes. It is especially potent when opposing the Metal of the Moon (silver), and is effective in piercing illusions and seeing truth in it's reflection. It is sacred to halflings, who live a vagabond life under the watchful gaze of the sun. It is not known to be useful as a weapon, though legend does have it no gold coin hits the ground before a halfling comes to pick it up, so it could be effective summoning magic...anyway, it's also valuable as currency because of it's rarity.
COLD IRON is actually changed to Lodestone IMC, and has magnetic properties. It is the Blessed Metal of the Earth, and highly skilled weaponsmiths can make versions of this metal that are basically as functional as a stell weapon. It is especially effective in opposing electrical energies, and is good for finding other metals and locating forces. It's magnetic properties make it a metal of law, aligning everything according to a well-predicted pattern, and thus it can help weaken some of the chaotic protections of demons, or eladrin, and the fact that it is solid and of the earth helps it overcome the unearthly and illusionary fey. The metal is sacred to the dwarves, who use it to develop their grand technologies. An upgraded version of lodestone is adamantium, which the dwarves use when they need to make sure no one can get through the wall.
CRYSTAL is sacred to gnomes, who have mastered the alchemical process of giving it qualities like Steel. It is the Blessed Metal of Life, since it grows and transforms over time. It is good at housing psionic energies (which the gnomes excel in), and in also making illusions and deceptions (also something gnomes are excellent at).
These are all IMC, btw. By default, cold iron works vs. fey, demons, eladrin....silver works vs. lycantrhopes, devils, archons...adamantine works vs. constructsSILVER is the Blessed Metal of the Moon. Highly skilled weaponsmiths can make versions of this metal that are basically as functional as a steel weapon. Because it is of the moon, it forces a painful reaction when lycanthropes are wounded by it. It is used in many rituals to control water, and is precious to the elves who worship the moon. Regarding it as based on something that changes and flows, rather than being constant, devils and archons find that it is able to dissolve much of their innate protections, especially when pared with good or evil alignment-energies. Silver is also valuable as a currency, due to it's rarity. An upgraded form of Silver is Mythral, which the elves fashion well.
GOLD is the Blessed Metal of the Sun. Highly skilled weaponsmiths can make versions of this metal that are basically as functional as a steel weapon. Such blades hold heat well, and are said to be especially potent when used against water-based elemental creatures or oozes. It is especially potent when opposing the Metal of the Moon (silver), and is effective in piercing illusions and seeing truth in it's reflection. It is sacred to halflings, who live a vagabond life under the watchful gaze of the sun. It is not known to be useful as a weapon, though legend does have it no gold coin hits the ground before a halfling comes to pick it up, so it could be effective summoning magic...anyway, it's also valuable as currency because of it's rarity.
COLD IRON is actually changed to Lodestone IMC, and has magnetic properties. It is the Blessed Metal of the Earth, and highly skilled weaponsmiths can make versions of this metal that are basically as functional as a stell weapon. It is especially effective in opposing electrical energies, and is good for finding other metals and locating forces. It's magnetic properties make it a metal of law, aligning everything according to a well-predicted pattern, and thus it can help weaken some of the chaotic protections of demons, or eladrin, and the fact that it is solid and of the earth helps it overcome the unearthly and illusionary fey. The metal is sacred to the dwarves, who use it to develop their grand technologies. An upgraded version of lodestone is adamantium, which the dwarves use when they need to make sure no one can get through the wall.
CRYSTAL is sacred to gnomes, who have mastered the alchemical process of giving it qualities like Steel. It is the Blessed Metal of Life, since it grows and transforms over time. It is good at housing psionic energies (which the gnomes excel in), and in also making illusions and deceptions (also something gnomes are excellent at).
