The world it came from
The spear was the ordinary weapon of the Norse levy — cheap, effective, and carried by far more men than could afford a sword. That everydayness is what makes Odin's spear terrifying: the god's weapon was the one in every man's hand. Bog deposits at Illerup Ådal and Nydam contain hundreds of spears deliberately destroyed and sacrificed after battle, the war-gear of defeated armies given to a god.