The One with the Weird Children

The three children of Loki, the Nordic demigod, were Jörmungandr, the World Snake, Fenrir, the wolf and _____, his only daughter, the ruler of the underworld. The Nordic people would curse each other by telling someone to go to her, which meant to go to die. This is the basis of a popular English phrase, which means more or less the same thing. What is his daughter's name?