Sword has had many incarnations over the years because his power is not drawn from the man, but rather from the ancient rune blade he wields, "The Sword of Ages". Indeed even his armor is a conjuration of the sword, and is made of bits of armor from hundreds of warriors that have wielded the sword through the milennia. When the sword is without master, and it is touched by someone with a black heart, the sword will bond with them, trading part of its malevolent essence with their own. They will be one with the sword, gaining its power, but also bowing to it's control.