I wouldnt neccessarily say its "gone wrong".. but it's far from being something you can label "good". The overall idea of the sword is rather cool, you've just executed it poorly with a gradient styled look.. you need to smoothen it out, and define things a bit more. Here's a rough edit to show you what i'm talking about, its not the greatest as it was very quick but have a look and hopefully you'll be able to see what needs to be fixed.
But other than that.. gj Soala.