Mardari Memory Metal, a rare and expensive synthetic metal, and more importantly, a "taboo item" that can only be synthesized by Mechanic Spiritualists.
Mardari is a person's name, who is also the developer of this material. The mere recipe and application technique is a valuable intellectual property worth a fortune... Who wouldn't like a "living metal" that can freely change its shape, density, and hardness? If the use and manufacture of this metal didn't require the intervention of Mechanic Spiritualists, it would have become the new technological cornerstone.
It is said that this liquid metal could be exchanged for several times its equivalent in gold... But no one would be foolish enough to actually sell it, as it is a prohibited and invaluable strategic material that no professional would find excessive.
