The Mother of the Fog is a sacred spirit worshipped by members of the Children of Atom, who they believe to be a saint of their god, Atom. The Sole Survivor finds her when they drink irradiated water from Atom's Spring on the Island during the quest Visions in the Fog. She is a dark, ghostly figure, shrouded in black smoke. She leads them to an abandoned building in the middle of the fog. It is here that they will find the "Mother icon," a small statue.