Built on Blood: Tales of Yst
Black Winter is a national holiday celebrated in Yst. The legend behind Black Winter is that a spirit known as Ded Moroz appears during a certain time of year and in a single night, steals all the items of value in the land. This includes artifacts, family heirlooms, and expensive items. In order to prevent Ded Moroz from taking their valuables, the families around the nation must put out an offering on their from doorstep. If their offering is enough, Ded Moroz will pass by their house, only taking that item. If not, then the family will awake the next morning to find their valuables gone.