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"
This is freakin' AWESOME! Mjolnir with the wolves Fenrir (son of Loki - will slay Odin at Ragnarok), Skol (chases the chariot that pulls the sun across the sky), and Hati (chases the moon). My inner Norse mythology geek is showing again, huh?