Loki in the context of "Fenrir"

In mythology, folklore and speculative fiction, shapeshifting is the ability to physically transform oneself through unnatural means. The idea of shapeshifting is found in the oldest forms of totemism and shamanism, as well as the oldest existent literature and epic poems such as the Epic of Gilgamesh and the Iliad. The concept remains a common literary device in modern fantasy, children's literature and popular culture. Examples of shape-shifters include changelings, jinns, kitsunes, vampires, and werewolves, along with deities such as Loki and Vertumnus.

Norse, Nordic, or Scandinavian mythology, is the body of myths belonging to the North Germanic peoples, stemming from Old Norse religion and continuing after the Christianization of Scandinavia as the Nordic folklore of the modern period. The northernmost extension of Germanic mythology and stemming from Proto-Germanic folklore, Norse mythology consists of tales of various deities, beings, and heroes derived from numerous sources from both before and after the pagan period, including medieval manuscripts, archaeological representations, and folk tradition. The source texts mention numerous gods such as the thunder-god Thor, the raven-flanked god Odin, the goddess Freyja, and numerous other deities.

Most of the surviving mythology centers on the plights of the gods and their interaction with several other beings, such as humanity and the jötnar, beings who may be friends, lovers, foes, or family members of the gods. The cosmos in Norse mythology consists of Nine Worlds that flank a central sacred tree, Yggdrasil. Units of time and elements of the cosmology are personified as deities or beings. Various forms of a creation myth are recounted, where the world is created from the flesh of the primordial being Ymir, and the first two humans are Ask and Embla. These worlds are foretold to be reborn after the events of Ragnarök when an immense battle occurs between the gods and their enemies, and the world is enveloped in flames, only to be reborn anew. There the surviving gods will meet, and the land will be fertile and green, and two humans will repopulate the world.

Fárbauti (Old Norse) is a jötunn in Norse mythology. In all sources, he is portrayed as the father of Loki. Fárbauti is attested in the Prose Edda and in kennings of Viking Age skalds.

Laufey or Nál is a figure in Norse mythology and the mother of Loki. The latter is frequently mentioned by the matronymic Loki Laufeyson ('son of Laufey') in the Poetic Edda, rather than the expected traditional patronymic Loki Fárbautason ('son of Fárbauti'), in a mythology where kinship is usually reckoned through male ancestry.

In Norse mythology, Ragnarök (also Ragnarok; /ˈræɡnərɒk/ RAG-nə-rok or /ˈrɑːɡ-/ RAHG-; Old Norse: Ragnarǫk [ˈrɑɣnɑˌrɒk]) is a foretold series of impending events, including a great battle in which numerous great Norse mythological figures will perish (including the gods Odin, Thor, Týr, Freyr, Heimdall, and Loki); it will entail a catastrophic series of natural disasters, including the burning of the world, and culminate in the submersion of the world underwater. After these events, the world will rise again, cleansed and fertile, the surviving and returning gods will meet, and the world will be repopulated by two human survivors, Líf and Lífþrasir. Ragnarök is an important event in Norse mythology and has been the subject of scholarly discourse and theory in the history of Germanic studies.

The event is attested primarily in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. In the Prose Edda and in a single poem in the Poetic Edda, the event is referred to as Ragnarøkkr (Old Norse for 'Twilight of the Gods'), a usage popularised by 19th-century composer Richard Wagner with the title of the last of his Der Ring des Nibelungen operas, Götterdämmerung (1876), which is "Twilight of the Gods" in German.

The Gosforth Cross is a large stone monument in St Mary's churchyard at Gosforth in the English county of Cumbria, dating to the first half of the 10th century AD. Formerly part of the kingdom of Northumbria, the area was settled by Scandinavians some time in either the 9th or 10th century. It has gained reputation for its combination of Christian symbols with Nordic symbols, being a tangible piece of evidence of the impact of the Christianization of Scandinavia.

The deities depicted on the monument have been identified with Sigyn attempting to protect her bound husband Loki, a horn-wielding Heimdallr, Víðarr in the process of defeating Fenrir, and Thor in a failed attempt to capture Jörmungandr. The images likely adapt scenes from the Poetic Edda. Also depicted on the monument is the crucifixion of Jesus. The tree-like design of the base of the cross may represent Yggdrasil or a mythical tree of life.