Bori was the god of the all the Hyborian tribes when they were barbarians. Thought to be a deified chieftain, a powerful war-leader who led the tribes to victory in their days of conquest, he is an ancient god. He is still worshiped in Hyperborea. The Gundermen still maintain small cults dedicated him in Aquilonia. The Gundermen are said to return to worshiping this ancient god after Aquilonia falls.
The practice of sorcery is considered unmanly among the Cults of Bori, so it is practiced by women called seidkona, who wear blue cloaks and black wool hoods trimmed with white cat fur. The cult is primarily animist and prayers to the spirit world constitute the majority of actual practice. Drunkenness is seen as a sign of Bori’s favor, for he has seen fit to allow spirits to possess the drunk person.