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Discover Watchdogs of Farron covenant.

Near the end of Farron's Keep, by the door you open by snuffing out the flames, is a tower full of slugs and next to that a ladder surrounded by more slugs. Head up this ladder and interact with the Wolf at the top. You need to get this Covenant to Rank 2 in order to acquire a unique ring, which requires 30 Wolf's Blood Swordgrass.

You get two in the swamp area and can acquire others by fighting off interlopers or farming the Ghru enemies. Spawn at the Keep Bonfire and kill the Ghru Caster and Spearmen on the bridge in front of you - rinse and repeat. The drop rate is roughly one in thirty if you have the Symbol of Avarice, Golden Covetous Serpent Ring and use a Rusted Coin.