Hel - half flesh half undead, Hel is the daughter of Loki and ruler of Niflheim, the Norse land of the dead. This is where the Christian idea of Hell comes from. As Norse mythology predates Christianity.
The best famous horse in Norse mythology is Sleipnir, The son of Loki. After Loki gave birth to him, he made Sleipnir a gift to Odin. Sleipnir has 8 legs& according to Snorri he's grey in color. Only the Norse people can come up with this stuff!