These materials are set apart from the worldly materials of iron and steel, and have properties that not only interest humans, but have made their way into legend.
Azoth is a black, tar-like substance found in place of water in the Path of Black Leaves. It is found in the sap, leaves, and wood of the trees there as well. It is also found in place of blood or other body fluids in higher-ranking proxies (such as The Afflicted). It reacts violently to any non-proxy touching it, taking on a quality similar to aqua regia if contact is prolonged, but any other material touching it or any attempt to heat it, cool it, or otherwise bring about a chemical reaction is met with totally unpredictable results. Azoth, at times, acts similar to a sentient being.