In the same entry, it is said that the blade 'has a destiny of its own. In The Paths of Destiny, according to a quest phase titled 'The Sword', the blade is exceptional: 'light, sharp as a razor, and fits the hand neatly'.
It can be received only in Chapter IV and can neither be bought nor sold. Aerondight is a silver sword used in fighting monsters, and is relatively ineffective against humans.