Not explicitly Norse but the Celtic chooser of the slain? Sounds like a Valkyrie to me.The Morrigan - Shape-shifting Celtic goddess of War, Fate and Death. Story in "The GODDESSES / Psychology of Female Power"
Before a battle, a viking would throw a spear as far as he could deep into the no-man's land, as was tradition. It represented the first battle in all of history, that was thrown by Odin during the creation of the world.