Chaos Witch Quelaag

A half-woman, half-spider demon located in a lair near the bottom of Blighttown. One of the Witch of Izalith's daughters, transformed into a monster by the Flames of Chaos. Her notable siblings are "The Fair Lady" and Ceaseless Discharge. She guards the second Bell of Awakening, and the entrance to her sister's domain. It may be worth knowing that she only fought you to protect her sister, who is in a permanent coma-like state So when you enter her sister's domain and talk to her, she thinks you are her sister, which is later revealed if you talk to her whilst wearing the Old Witch's Ring.