C1773 Black gold secret power of death!

The most mysterious metal that Xia Lei had ever seen was the World's Box's "ancient alloy". It looked like bronze, but even if the entire universe's bronze was swapped, under the framework of equivalent exchange of energy, it would not be able to be swapped for a piece of "ancient alloy".

The second was the metal of the Saint King Lan Ling's Ares suit