They are the only ones that see use of the metal for weapons, other races see more worth in bronze. Her spear could be meteoric iron if we were following bronze age history, but with kitsune iron work happening and Daliza having some it means that the Winter City has the ability to get iron work done.
Cupronickel could be our silvery alloy of choice as the Chinese seem to have developed it as silver nickel and early enough to line up with some minos weapons, cupronickel is seawater resistant which would be helpful.