Unlocks the oldest cell in the Profaned Capital. From the Profaned Capitalbonfire, climb down the nearby ladder and proceed through the level until reaching a ruined church located among the toxic swamp. Climb up the ladder on the right and head forward until reaching the rooftops (fighting the Unkindled Apprentice along the way). Look for an open window nearby and jump inside. The cell can be found just ahead, with a body inside holding the Covetous Gold Serpent Ring.
If the player followed Siegward's questline, he can also be found at this location and will present a Titanite Slab in gratitude for freeing him.