Lead

As one of the two metals used in Yophasian currencies, lead is a pretty valuable metal. Most importantly, lead is one of two metals in Yophas to be completely anti-magic. Like gold, lead is dead in the lunar-arcane---enchantments can't stick to it, and it cannot be transmuted. It is for this reason that lead forms the lower denominations of Yophasian currency.   Besides its use as a currency, lead is also beloved for anti-magic defenses and traps. As the less valuable (and more abundant) of the two anti-magic metals, lead is used for countless mage traps and anti-divination defenses. Solid lead cannot be penetrated by magic (though it can be destroyed by a magicborne force, like a blast of energy or bludgeoning rubble) and so the rich and powerful will often build safe rooms and bunkers out of pure lead; however, the smallest weakness in the design renders the entire thing meaningless for anti-divination, so the scale of these are often small for the sake of ensuring their efficacy.