Mithril is the product of slaying metal and then reconstituting it, belonging to a special category of metals that have lost their golden properties yet gained life. It is not as hard as steel and less malleable than gold, but it is extremely pure, making it an excellent material for constructing Magic Arrays, second only to the Crystal Tree Core.
The strength of the Golden Law lies far beyond the creation of mithril, just as Yuniya just mentioned, the mystery of the Golden Law is in controlling metals, one could even say it is the master of metals.
In Yuniya's hands, a piece of scrap iron can turn into gold, and a chunk of gold can turn into brass in the blink of an eye; she can create any metal needed. Atlantis is a city entirely constructed of metal.
This is the last gift from the Golden Gods...
After some contemplation, Marvin still chose to tell Holmes the intelligence he had acquired and requested him to retreat to London at maximum speed.