Talk:Knight Artorias/@comment-90.209.200.129-20121024170854/@comment-1687225-20121110060803

SPOILER:

it's an interesting point, and I guess we'll never find out (as with most of the lore in Dark Souls). My guess is that he injured his arm during his fight with Manus and never got around to recovering after he was corrupted by the Abyss.

On a possibly related note, one of Manus' hands is considerably larger and more dangerous than the other.