I was listening to the Dark Souls lore while I was playing the game, just because I wanted to get a handle on the game's mythology. I had already beaten the game before so this was New Game+ for me. In my previous game, Quelaag had beaten the hell out of me. So on this run through, I decided "it was payback time, Bitch!" Ironically enough, the lore chapter I was listening to was about the Chaos Sisters and the Witch of Izalith. After killing her (which was way easy), I found myself at the fair lady's area, where I just wanted to light the bonfire so I could warp back to it later. I listened to what the lore said about her and all the terrible crap she had to go through. How she was sick and dying and how only humanity could save her.
How Quelaag wasn't her enemy, but the only companion she had left. The only one who was willing to take care of her... That is ... until I came in butchered her like an animal. I'll tell you right now, listening to that lore and being in the same room as her. Broke my heart. From that moment on I swore I would be a Chaos Covenant member for life. That is just too much crap to happen to a person who's only crime is she wanted to help the people of Blighttown.