Heimdall keeps Gjallarhorn at Bifröst, ready to sound the alarm when enemies approach Asgard. At Ragnarök, his blast on the horn signals that the fire giants have reached the bridge.
The sound of Gjallarhorn rouses the Einherjar from Valhalla at Ragnarök. Heimdall's horn, kept at Bifröst, signals the final battle the warriors have trained for since the world's beginning.
Gjallarhorn is Heimdall's horn, kept silent through the ages until Ragnarök. When the forces of chaos march on Asgard, Heimdall will sound it to summon the gods to their final battle. Its blast carries across all Nine Worlds.
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