Soul Edge (Earth-19999)

Soul Edge is a central weapon as well as antagonist in the Mortal Fighter Series. Originally forged, 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, who was used by Onaga, the ancient ruler of Outworld. 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.