is it possible to level weapons up like from sky piercer to one of Lu Bu's higher level weapons?

how do you upgrade the weapons from their current level to a higher one like Sky Piercer to Heron Blade Halberd to [i]Demon Bane....plz reply

The weapons don't upgrade to new weapons. Just level one to level ten, gaining more attacks. You can give it effects if you've got the gems and the cash, special abilities. Other than that, Sky Piercer will always be Sky Piercer. Still, give it the right upgrades, it'll feel like a different weapon after a while. Starts out with a low combo piece of junk and spend time and money on it, it turns into something that can makes your character a walking war crime.