On the 2nd floor of the Nexus, in the big empty space, a woman the Slayer of Demons has never seen before appears leaning against a wall. She wears a hood and gold mask.

Mephistopheles: "I can see that you have killed in the past… No one can blame you for that. Demon souls are too precious to relinquish… Perhaps a knight like you would have an interest in my offer?"