I feel bad reading all these comments about how she's bad. She landed the final blow against Abyss Watchers, right after I had died, giving me the victory. I can't mind if she dies while I'm helping her out.
Wow, Sirris. You were so utterly worthless in combat when I tried to help you against your senile grandad. 7 times. So I decided to offer Rosaria pale tongues to further myself and killed your stupid *** to collect your souls. No regrets.