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He was said to be an evil-minded person, as his evil spirit passed into the very blade he made for the ronin. He didn't have as much dedication to his work as Masamune, who worked on forming a sword for a year, while Muramasa cut it down to six months.
According to legend, Masamune was hired to create a sword of great magical power by a ronin. He was able to do this in one year, but his evil apprentice Muramasa secretly offered to make one in six months. When Muramasa delivered this sword to his customer, evil entered into the ronin and he became the Black Samurai. The cursed sword became known as the Sword of Doom.
- DTV13. Scooby-Doo! and the Samurai Sword (flashback, no lines)