User blog comment:Thornclaw Braveheart/Witch-king of Angmar vs. Eragon Bromsson/@comment-143604-20111128221144/@comment-2006360-20111128234116

Either way, Drayco, we both mean the same thng; it is not possible for Eragon himself to kill the Witch-king. However, here's something I am allowing; since the Witch-king's protection from weapons of the visible world are sort of like pseudo-wards, and Brisingr can penetrate any known wards, Eragon can wound the Witch-king, but not kill.