 In the "Prose Edda" book "Gylfaginning", Hel is described as having been appointed by the god Odin as ruler of a realm of the same name, located in Niflheim.In the same source, her appearance is described as half blue and half flesh-coloured and further as having a gloomy, downcast appearance.The "Prose Edda" details that Hel rules over vast mansions with many servants in her underworld realm and plays a key role in the attempted resurrection of the god Baldr.