Lost Sinner

The Lost Sinner is a minor antagonist from Dark Souls II. Her imprisonment within Sinners' Rise was purposely emitted to atone for her past sins. The Sinner has since gone mad from the years she stayed restrained and will eagerly kill anyone who approaches.

Biography
Little is known about the origins of the Lost Sinner, although from her dropping the Old Witch Soul in New Game Plus runs, it could be presumed that she may be a descendant to the Witch of Izalith. According to Sweet Shalquoir, the reasoning behind the Lost Sinner's isolation was because she committed what some believe the most taboo action of all: attempting to duplicate the First Flame. Remorseful for her actions, the Lost Sinner restrained herself to atone for her sins. Over time the Lost Bastille was built around the Lost Sinner, her backstory seemingly forgotten.

The Lost Sinner can be found at the very top of Sinners' Rise, a tall tower in the Lost Bastille to seal away the worst of the hollows of Drangleic. Before the battle, a small bug crawls into her mask, sending the Lost Sinner into a frenzy to attack the Bearer of the Curse. She swings her sword hard enough to snuff out the lanterns that light the room, meaning that the player has to fight her in darkness unless they use the Bastille Key to unlock two doors next to the arena to light the lanterns with a torch. Despite all of the restraints on her body, the Lost Sinner is an agile opponent who swings her sword very frantically. From slashes and thrusts, she can even leap into the air and slam her weapon down. If far away, the Lost Sinner will perform a charge. She can even parry the player as telegraphed when she holds her sword's hilt to her face, blocking any incoming attack and reposte them for extremely heavy damage. Defeat the Lost Sinner for access to one of the Primal Bonfires.

Trivia

 * The bug that enters the Lost Sinner eye hole resembles the bug found within the Bed of Chaos, further implying the rumor that she is connected to the Witch of Izalith, or even the Witch's incarnate.
 * In New Game Plus, the Lost Sinner drops the Old Witch Soul alongside her soul.
 * During the battle in New Game Plus, when the Sinner reaches half health, two black phantom pyromancers enter the arena to aid her.
 * After defeating the Sinner, Maughlin the Armorer will sell the Penal Set.