Board Thread:Dark Souls/@comment-28730994-20160612171028/@comment-25257440-20160612172228

There is still one Fire Keeper, called Quelaag's Sister you can go upgrade your Flasks with. She's located at the very end of Quelaag's Domain after the boss fight, downstairs from the other Bell of Awakening behind an Illusory Wall. She also initiates the Chaos Servant covenant.