Nidavellir

Nidavellir (Niðavellir) is a realm in Norse mythology, the homeland of the dwarfs (dvergar). Its name is often translated as "dark fields" or "low fields," reflecting its subterranean, dim nature. In older sources, Nidavellir is described as a vast underground realm beneath the earth or within the roots of mountains, accessible by various tunnels and halls. The dwarfs are renowned smiths and artisans who craft powerful magical items for the gods, heroes, and monsters.

In most Norse myths, Nidavellir is the site where several legendary artifacts were forged. The dwarfs Brokkr and Eitri (or Sindri) forged Mjölnir, the hammer of Thor; Draupnir, Odin's self-multiplying ring; and Gungnir, Odin's spear, among others. The dwarfs are usually depicted as living in Nidavellir along with other dwarven communities, thriving in workshops and caverns where gold and gems are abundant.

In popular culture, Nidavellir appeared in Marvel Comics and the Marvel Cinematic Universe as the home of a dwarven civilization and their star-forge technology. In the MCU, Nidavellir is depicted as a forge-world orbiting a dying star, ruled by Eitri; it is the site where Thor's weapon Stormbreaker was created. The realm is shown as being destroyed during Thanos's assault, with Eitri the only survivor.