Talk:Chaos Blade/@comment-24.214.159.22-20121011184652/@comment-1687225-20121011185520

You need to go to the Giant Blacksmith with the soul, the uchigatana, and the right amount of souls. Go to "Weapon Ascension" from his upgrade options and scroll around until you find the option to upgrade from "Uchigatana +10" to "Chaos Blade".