The Soul Calibur is a legendary sword from a fighting game of
the same name. It is locked in an eternal clash with the Soul Edge;
in this clash, the Soul Calibur represents benevolence, the Soul
Edge malevolence. All the characters considered "good" are fighting
for the Soul Calibur, while the characters fighting for the Soul
Edge are "evil".
Like the Soul Edge, it has the ability to take the form of
whatever weapon its holder uses.