WTF is wrong with that blade? Katanas can be used as backstab machine right? THAT WEAPON DOESN'T!!!!!!!!!!!! PLUS ITS KATANA AS WELL!!!!!!!!!!!!!!! AND celestial fury does backstab as well!!!!! WTF is wrong with that blade?????

Is Valygar coming out of stealth before he attacks? If so, then the attack is not a backstab, just attacking from behind. What's the difference? When stealthed, the opponent can't see you coming. I never tried it, so I don't know, but all the other katana's that I have used to backstab worked.