The Copper Key is a Key in Ninja Gaiden II.
In-Game Description[]
A wine cellar key, cast from a unique copper alloy known as Shakudo.
The distinctive reddish-black hue of the metal is peculiar to artifacts created from traditional Japanese alloys. It is strange indeed that such a priceless Japanese antique would surface here in the West.
According to one theory, an Oriental blacksmith visited this area during the Renaissance, leaving many metal objects behind -- this mysterious key among them.
Acquisition[]
In the room atop the staircase past the ambush of Gaja and Van Gelf.
Effects[]
Opens the gate of the room holding The Art of the Flame Phoenix.