Allows attunement of additional spells
Undead Settlement, Dilapidated Bridge bonfire
You will need to free Irina of Carim from her cell in the Undead Settlement
To do so, from the Dilapidated Bridge bonfire, head forward to where the Giant is throwing arrows, make a left then when pass the hut with the Thrall on top, proceed to the end of the graveyard to find the Mortician’s Ashes. Take the Ashes to the Shrine Maiden in Firelink Shrine where you can then buy the Grave Key for 1,500 souls
Next, head to the Undead Settlement, Cliff Underside bonfire
Make your way out from the bonfire, going down the ramps, take right then stay against the right wall. Drop down into the sewer, halfway down on the left is a locked gate, unlock it with the Grave Key, then head down and through the area taking care of the Skeletons as you go, once outside in the gully, head left and straight, go through, mind the Rats then climb the ladder to find Irina of Carim slumped in her cell. Agree to touch her then accept her service where she will head over to Firelink Shrine
Head right from Andre the blacksmith to find Irina slumped on the floor, interact with her then purchase the Saint’s Ring for 300 souls