|The canonicity of this article's subject remains dubious. Though it doesn't contradict official continuity, it has not been referenced in any confirmed canonical material.|
Marie-Christine Du Lac was a Slayer active in 1789, France.
Countess Marie-Christine was a Slayer who lived in Marie-Antoinette's royal palace at Versailles, along her Watcher and guardian Edmund de Voison, and served exclusively the interests of the royal family and the French court. After almost failing a mission against the vampire Marquis de Rochembourg, the royals became displeased with her work, and the queen considered requesting a new Slayer to the Watchers Council.
In September 1789, Marie-Christine attempted to redeem herself investigating L'Hero, a vampire who was causing rebellion among the poor. Originally, Marie-Christine despised the poor of France, an attitude shared by her Watcher and most of the court. Her attitude slowly changed upon infiltrating the lower classes and meeting a little girl, Mathilde, the first she felt compelled to help. Marie-Christine eventually confronted L'Hero, although he was protected by the people, who already knew he was a vampire. They did not care about his demonic nature, since the situation he created was better than what the royals ever had done for them, and neither that the attacks he coordinated brought him personal benefits.
The life of the Slayer fell apart as the rebellion erupted around her, and she failed to protect the royal family, going after L'Hero as he captured Mathilde. Sir Stephen, a Council representative, revealed to Marie-Christine she had been born a peasant, but insisted that she should dedicate herself only to the king and queen. She was then intercepted by L'Hero, who informed her Mathilde was being kept hostage in order to compel her to do her duty: help the people.
Meanwhile, Edmund was about to be guillotined, and Marie-Christine finally staked L'Hero. Then with Mathilde, she went after her Watcher and attempted to argue in his favor, but he refused her defense. She told him she was the Slayer and had to protect the innocent, and after she had slayed L'Hero the vampires would stop. Just before his death, Edmund asked her: "Do you see how miserably you have failed in your duty?" As his head rolled, Marie-Christine fell on her knees, and Mathilde grabbed her hand, the child's felling cold as the grave.