The Blood-Horn was among the treasured artifacts of the All-High, the Gangrel Methuselah who ruled much of Scandinavia during the period of the Vikings. When one drop of blood was added to the ale within, the whole liquid would change into blood. The same would occur with vampiric vitae and mead, which made it possible for the All-High and his einherjar to substain themselves without leaving his temple in Uppsala. When the All-High disapperead, so did the Blood-Horn.