Nidavellir was the home of the Dwarves, and one of their main activities was to serve as blacksmiths. As such, Nidavellir presented some of the best forges in the Nine Realms. It was here where they created the hammer Mjølnir.
In a plot to overthrow Odin, Imir invaded Nidavellir and barricaded himself in the Golden Forge. There, he took the Dwarven Smiths as hostages and made them forge an axe capable of cutting through the fabric of reality.
When Thor arrived at Nidavellir, he confronted Imir, but he was taken by surprise by the powers of Imir's Axe, that allowed him to open small portals and teleport himself through the room, catching Thor off-guard until he was able to summon lightning through the chimney of the forge, electrocuting Imir and liberating the Dwarves.
During the following conflict in which Thor commanded the Einherjar to restore peace to the Nine Realms, Nidavellir was one of the worlds restored to its former glory after the attacks. Nidavellir was also one of the realms written on Erik Selvig's chalkboard when he tried to explain the event known as the Convergence.
Sometime after the Second Dark Elf Conflict, Thanos arrived on Nidavellir and demanded the Dwarves to forge him a device capable of harnessing the power of the Infinity Stones. Eitri complied with his demands and constructed the Infinity Gauntlet in hopes that he and his people would be spared from the Mad Titan's wrath. His hopes were futile; however, as upon acquiring the newly forged Gauntlet, not only did Thanos proceeded to massacre the entire Dwarven population, leaving only Eitri to be the sole survivor of the station and his race, he also encassed Eitri's arms in molten metal, thus crippling the Dwarf King. Sometime after the event, the neutron star at Nidavellir's core was sealed in its Dyson sphere, leaving the entire station and its forges to be frozen shut.
During the conflict with Thanos, Thor ventured to Nidavellir with Rocket Raccoon and Groot to forge Thor's new weapon. Upon arriving, the typically lively forges of Nidavellir were cold and barren, littered with broken parts. The initially scared Eitri found himself reunited with his friend and explained that the dwarves had been rendered all but extinct and his hands had been fused off with metal by order of Thanos.
With Thor and Rocket Raccoon's help, Eitri reignited the star and re-lit the forge, creating Stormbreaker with a handle made from Groot's arm. The then smoking husk of Thor was revived and used the power of the Bifrost Bridge to go forth to Wakanda and assist his fellow Avengers.
- In the comics, Nidavellir is located in the middle of the World Tree and houses numerous forges in its caverns.
- In some depictions of Norse mythology, Nidavellir is alternately known as Svartalfheim.