In Old Norse, Chaos can be referred to as "Káos" or "Trú." However, the concept of Chaos may not have had a direct equivalent in Old Norse cosmology as in other mythologies.

The Norse gods, or Aesir, live in the realm of Asgarth (also spelled Asgard). It's one of the nine worlds of pre-Christian Germanic cosmology.

Midgard is the name of one of nine worlds in Norse cosmology. It roughly translates to "middle earth" or "middle place" and is the land in which humans dwell.

The Prose Edda was written by Snorri Sturluson, an Icelandic scholar and historian, in the 13th century. It is a collection of Old Norse myths, poetic tales, and legends that provide insight into Norse mythology and cosmology.

Ragnarok is a term from Norse mythology that refers to a series of events, including the final battle between the gods and their enemies, leading to the destruction of the world and the subsequent rebirth of a new world. It signifies a catastrophic and apocalyptic event in Norse cosmology.