In Norse mythology, the Valkyries are warrior maidens who serve the god Odin. Their primary function is to choose those who will die in battle and those who will live. They guide fallen warriors to Valhalla, Odin's hall of the slain, where the honored heroes prepare for Ragnarok. The Valkyries embody strength, bravery, and the warrior spirit, representing the duality of fate and death in Norse beliefs. Their role emphasizes the importance of valor and honor in battle.