The Dark One is the evil enemy of the Creator, trapped in Shayol Ghul but seeking his freedom through the actions of the Forsaken, Dreadlords, and Darkfriends. Among his names are "Shepherd of The Night"(Two Rivers), "Soulsbane", "Heartfang", "Lord of the Grave", "Lord of the Twilight", or "Father of Lies".
Naming the Dark One(as Shai'tan)is thought to bring bad luck.