I just reached the boss room of Artorias. I read on the Dark Souls Wikidot that once defeated, a woman named Ciaran (one of Gwyn's four knights) appears in order to mourn the death of Artorias. If you give her Artorias's Soul, she would give you 2 special weapons, but you can also obtain these weapons AND her armor if you kill her.
The problem is that I don't want to kill her for such a selfish reason. Maybe you'll say I play too much RP, but I just can't bring myself to attack someone which is not hostile to me (I didn't killed the boss of Ariamis World). But I'm kinda interested in Ciaran armor. Thus the question is : Is there another way to obtain Ciaran's set, without having to brutally murder an innocent woman while she is mourning the death of her "lover" ?