The name of the Norse goddess associated with the underworld is Hel. Hel is the daughter of Loki and is depicted as a figure who governs over the realm of the dead, also named Hel. This realm is where those who did not die a heroic death end up. Hel is often portrayed with a half-living, half-dead appearance, symbolizing her dual nature as a guardian of the deceased. Her character reflects the Norse understanding of death and the afterlife, holding significant Mythological importance.