Why, Carrot's sword!
"Surprisingly, therefore, there is something very unexpected about this sword. It isn't magical. It hasn't got a name. When you wield it you don't get a feeling of power, you just get blisters; you could believe it was a sword that had been used so much that it had ceased to be anything other than a quintessential sword, a long piece of metal with very sharp edges. And it hasn't got destiny written all over it it.
It's practically unique, in fact."