In Norse mythology, a valkyrie is one of a host of female figures who decide who will die in battle. Selecting among half of those who die in battle, the valkyries bring their chosen to the afterlife hall of the slain, Valhalla, ruled over by the god Odin
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"