Niflheim is pronounced “Nif-el-hame” and relates to the Norse word Niflheimr, which translates to “World of Mist”.
The word refers to one of the nine worlds of Norse mythology.
This particular world was a land of ice, darkness, and fog and was the cosmological opposite of Muspelheim, which was the Norse world of fire.
Ruler of the Realm
The Goddess Hel, daughter of Loki eventually became ruler of the realm after she was cast into it by Odin.
Born From Two Worlds
The medieval Icelandic historian Snorri Sturluson once wrote about a giant known as Ymir was born from fire and ice when Niflheim and Muspelheim met together in the center of Ginnungagap, an abyss which kept them apart up until that point.