Gungnir

History
Odin's spear Gungnir is an artifact made of a metal unique to the dimension of Asgard, uru. The three-pronged spear is of unknown origin, pre-dating the current incarnation of Odin himself. At Odin's "birth" at the dawn of the current age of Asgardians, he found Gungnir on the Plains of Ida and used it to focus his power to fashion Asgard as it is known today. Gungnir possesses no known powers of its own; it seems to be a simple conduit for the channeling of personal energies. Like anything made of uru, the spear holds enchantments well. Odin has enchanted the spear to return to his hand when thrown, just as he enchanted his son Thor's uru hammer to do so.