Soul Edge

Soul Edge is the central antagonist in the Soul series of fighting games and namesake to the first installment. Originally forged by human hands, at first Soul Edge was just an ordinary sword, but after being bathed in blood and hatred countless times, the sword turned into a demonic weapon and gained a wicked soul, which the games called Inferno. Those who grasp its hilt are unable to escape its curse, as its spirit invades the mind like a parasite and drives its wielder insane. As its blade is soaked in blood it grows in power, yet it manages to shine a polished red. Soul Edge is distinguished by the animate eye. However, the fifth installment of the SoulCalibur series offers a different explanation. According to the story, Soul Edge was originally forged out of the power and strength of the body of Algol, the Hero King, as opposed to Soul Calibur, being forged from his mind.