In Norse mythology, the realm of the dead ruled by the goddess Hel is called Helheim. Hel, the daughter of Loki, governs this underworld where souls of the deceased dwell, particularly those who did not die valiantly in battle. Unlike other realms, Helheim is depicted as a gloomy place, contrasting the more glorious Valhalla, where heroic souls reside. Hel's domain signifies the final resting place for many, embodying the nuances of death and the afterlife in Norse beliefs.