While the first seven games were loosely based on Greek mythology, this installment is loosely inspired by Norse mythology, taking place at least 150 years after God of War III. Six of the nine realms of Norse mythology can be explored. Predating the Vikings, most of the game takes place in ancient Scandinavia in the realm of Midgard, which is inhabited by humans and other creatures. It is the same realm in which the Greek world existed. As more dangerous creatures began appearing, many humans fled. Other realms visited as part of the story include Alfheim, the mystical home of the light and dark elves; Helheim, the icy land of the dead; and Jötunheim, the mountainous land of the Giants. Optional explorable realms include Niflheim, a realm of poisonous fog with a maze-like structure of rewards; and the fire realm Muspelheim, featuring the six Trials of Muspelheim—completing each trial grants rewards and advances Kratos and Atreus closer to the top of a large volcano.
