By Anders Sandberg, for the Asatru tradition.
One of the most prized possessions of Odin was the ring Draupnir, which every ninth night spawned eight similar rings. Some of these rings also had the power of multiplication, and a few seems to have been accidentally given to humans (or stolen). These rings look like a heavy Viking ring of pure gold, artfully ornamented into three dragonsnakes braiding together and biting their tails. If left alone, it will spawn eight similar rings every ninth night. It was originally made by the dwarves, and no dwarf can resist any chance of getting the ring, by whatever means.