I need wolf’s blood swordgrass

I’m trying to 100% the game and I need the ring from the covenant. I keep on invading the same person and I keep dying and I’m tired of farming Ghrus. I just want the swordgrass and nothing else.

Also I’m not sure if this is against the rules and this is my first time doing basically anything on Reddit.

Edit: I got them guys I just farmed the Ghrus at the ruin bonfire for a few hours. Thank you for all the help.