Rudolf Steiner
Germanic Mythology and Ancient Civilizations
Muspelheim: Contrasted with Niflheim.
Two realms were spoken of: Niflheim and Muspelheim.
Niflheim is the misty region of the north, the dawning mist-filled conditions of the Hyperborean root race, in contrast to Muspelheim.
Hanns Hörbiger
The World Ice Theory
The universe begins with two primordial realms—Niflheim (home of mist) and Muspelheim (home of fire).
From the mist of Niflheim and the heat of Muspelheim, the first being, Ymir, a frost giant, is formed.