The Russian God of darkness, thought to be the cursed twin of Bielebog, the god of light. Little is known about Czernobog other than his black appearance and his hammer weapon. Gaiman interprets Czernobog and Bielebog as two halves of the same man, with different aspects coming out in different seasons. The gruff, blood-obsessed Czernobog rules over the winter and agrees to help Shadow and Mr. Wednesday only because Shadow promises to give Czernobog the chance to smash Shadow’s skull with a hammer. After Czernobog turns into Beilebog in spring, though, he has mercy on Shadow.