The Mark of Protection was a symbol used by witches to protect a person. Amy Madison, Michael Czajak and Willow Rosenberg used this mark to aid the Slayer. However, a demon took the appearance of two children killed during a black ceremony, with the mark drawn on their hands. Buffy suspected Willow of the killings when she found the mark in Willow's notepad. Willow admitted the real utility of the mark, preventing the protection from becoming established because the aimed person wasn't to know of the spell for it to have effect.