The shimmering rainbow bridge connecting Midgard to Asgard.

Bifröst is the three-hued bridge of fire, water, and air built by the Æsir as a road between the divine world and the world of humans. It is guarded by the god Heimdallr, who never sleeps and can hear grass growing.

At Ragnarök Bifröst shatters under the weight of the riders from Múspellsheimr, symbolising the definitive rupture between the divine and human spheres in the Norse myth of doom.

Attestations

Grímnismál 29
Names Bifröst as the sacred bridge of the Æsir.